I am receiving warning in Facebook Application using PHP SDK

You need to ensure that any code that modifies the HTTP headers is executed before the headers are sent. This includes statements like session_start(). The headers will be sent automatically when any HTML is output.

Your problem here is that you're sending the HTML ouput at the top of your page before you've executed any PHP at all.

Move the session_start() to the top of your document :

<?php    session_start(); ?> <html> <head> <title>PHP SDK</title> </head> <body> <?php require_once 'src/facebook.php';    // more PHP code here.

PHP array value passes to next row

Change the checkboxes so that the name includes the index inside the brackets:

<input type="checkbox" class="checkbox_veh" id="checkbox_addveh<?php echo $i; ?>" <?php if ($vehicle_feature[$i]->check) echo "checked"; ?> name="feature[<?php echo $i; ?>]" value="<?php echo $vehicle_feature[$i]->id; ?>">

The checkboxes that aren't checked are never submitted. The boxes that are checked get submitted, but they get numbered consecutively from 0, and won't have the same indexes as the other corresponding input fields.

Adding a UISegmentedControl to UITableView

   self.tableView.tableHeaderView = segmentedControl;

If you want it to obey your width and height properly though enclose your segmentedControl in a UIView first as the tableView likes to mangle your view a bit to fit the width.

enter image description here

How to use a global array in C#?

Your class shoud look something like this:

class Something {     int[] array; //global array, replace type of course     void function1() {        array = new int[10]; //let say you declare it here that will be 10 integers in size     }     void function2() {        array[0] = 12; //assing value at index 0 to 12.     } }

That way you array will be accessible in both functions. However, you must be careful with global stuff, as you can quickly overwrite something.

Pass PDO prepared statement to variables

You could do $stmt->queryString to obtain the SQL query used in the statement. If you want to save the entire $stmt variable (I can't see why), you could just copy it. It is an instance of PDOStatement so there is apparently no advantage in storing it.

C# - insert values from file into two arrays

string[] lines = File.ReadAllLines("sample.txt"); List<string> list1 = new List<string>(); List<string> list2 = new List<string>();  foreach (var line in lines) {     string[] values = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);     list1.Add(values[0]);     list2.Add(values[1]);  }

Parameter binding on left joins with array in Laravel Query Builder

You don't have to bind parameters if you use query builder or eloquent ORM. However, if you use DB::raw(), ensure that you binding the parameters.

Try the following:

$array = array(1,2,3);       $query = DB::table('offers');             $query->select('id', 'business_id', 'address_id', 'title', 'details', 'value', 'total_available', 'start_date', 'end_date', 'terms', 'type', 'coupon_code', 'is_barcode_available', 'is_exclusive', 'userinformations_id', 'is_used');             $query->leftJoin('user_offer_collection', function ($join) use ($array)             {                 $join->on('user_offer_collection.offers_id', '=', 'offers.id')                       ->whereIn('user_offer_collection.user_id', $array);             });       $query->get();

Use NSInteger as array index

According to the error message, you declared myLoc as a pointer to an NSInteger (NSInteger *myLoc) rather than an actual NSInteger (NSInteger myLoc). It needs to be the latter.

I need to know how to get my program to output the word i typed in and also the new rearranged word using a 2D array

What exactly doesn't work?
Why are you using a 2d array?

If you must use a 2d array:

int numOfPairs = 10;  String[][] array = new String[numOfPairs][2]; for(int i = 0; i < array.length; i++){     for(int j = 0; j < array[i].length; j++){         array[i] = new String[2];         array[i][0] = "original word";         array[i][1] = "rearranged word";     }    }

Does this give you a hint?

strange error in my Animation Drawable

Looks like whatever is in your Animation Drawable definition is too much memory to decode and sequence. The idea is that it loads up all the items and make them in an array and swaps them in and out of the scene according to the timing specified for each frame.

If this all can't fit into memory, it's probably better to either do this on your own with some sort of handler or better yet just encode a movie with the specified frames at the corresponding images and play the animation through a video codec.

Hadoop MapReduce: Strange Result when Storing Previous Value in Memory in a Reduce Class (Java)

It is very inefficient to store all values in memory, so the objects are reused and loaded one at a time. See this other SO question for a good explanation. Summary:

[...] when looping through the Iterable value list, each Object instance is re-used, so it only keeps one instance around at a given time.

javascript, for loop defines a dynamic variable name

I think you could do it by creating parameters in an object maybe?

var myObject = {}; for(var i=0;i<myArray.length;i++) {     myObject[ myArray[i] ]; }

If you don't set them to anything, you'll just have an object with some parameters that are undefined. I'd have to write this myself to be sure though.

Got a NumberFormatException while trying to parse a text file for objects

NumberFormatException invoke when you ll try to convert inavlid String for eg:"abc" value to integer..

this is valid string is eg"123". in your case split by space..

split(" "); will split line by " " by space..

Querying date field in MongoDB with Mongoose

{ "date" : "1000000" } in your Mongo doc seems suspect. Since it's a number, it should be { date : 1000000 }

It's probably a type mismatch. Try post.findOne({date: "1000000"}, callback) and if that works, you have a typing issue.

Real time face detection OpenCV, Python

Your line:

img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

will draw a rectangle in the image, but the return value will be None, so img changes to None and cannot be drawn.

Try

cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

Are these methods thread safe?

The only problem with threads is accessing the same object from different threads without synchronization.

If each function only uses parameters for reading and local variables, they don't need any synchronization to be thread-safe.

Laravel 4 with Sentry 2 add user to a group on Registration

Somehow, where you are using Sentry, you're not using its Facade, but the class itself. When you call a class through a Facade you're not really using statics, it's just looks like you are.

Do you have this:

use Cartalyst\Sentry\Sentry;

In your code?

Ok, but if this line is working for you:

$user = $this->sentry->register(array(     'username' => e($data['username']),     'email' => e($data['email']),      'password' => e($data['password'])     ));

So you already have it instantiated and you can surely do:

$adminGroup = $this->sentry->findGroupById(5);

How do I show a message in the foreach loop?

You are looking to see if a single value is in an array. Use in_array.

However note that case is important, as are any leading or trailing spaces. Use var_dump to find out the length of the strings too, and see if they fit.

Message: Trying to access array offset on value of type null

This happens because $cOTLdata is not null but the index 'char_data' does not exist. Previous versions of PHP may have been less strict on such mistakes and silently swallowed the error / notice while 7.4 does not do this anymore.

To check whether the index exists or not you can use isset():

isset($cOTLdata['char_data'])

Which means the line should look something like this:

$len = isset($cOTLdata['char_data']) ? count($cOTLdata['char_data']) : 0;

Note I switched the then and else cases of the ternary operator since === null is essentially what isset already does (but in the positive case).

Array and string offset access syntax with curly braces is deprecated

It's really simple to fix the issue, however keep in mind that you should fork and commit your changes for each library you are using in their repositories to help others as well.

Let's say you have something like this in your code:

$str = "test";
echo($str{0});

since PHP 7.4 curly braces method to get individual characters inside a string has been deprecated, so change the above syntax into this:

$str = "test";
echo($str[0]);

Fixing the code in the question will look something like this:

public function getRecordID(string $zoneID, string $type = '', string $name = ''): string
{
    $records = $this->listRecords($zoneID, $type, $name);
    if (isset($records->result[0]->id)) {
        return $records->result[0]->id;
    }
    return false;
}

Unable to allocate array with shape and data type

change the data type to another one which uses less memory works. For me, I change the data type to numpy.uint8:

data['label'] = data['label'].astype(np.uint8)

Element implicitly has an 'any' type because expression of type 'string' can't be used to index

This happens because you try to access plotOptions property using string name. TypeScript understands that name may have any value, not only property name from plotOptions. So TypeScript requires to add index signature to plotOptions, so it knows that you can use any property name in plotOptions. But I suggest to change type of name, so it can only be one of plotOptions properties.

interface trainInfo {
    name: keyof typeof plotOptions;
    x: Array<number>;
    y: Array<number>;
    type: string;
    mode: string;
}

Now you'll be able to use only property names that exist in plotOptions.

You also have to slightly change your code.

First assign array to some temp variable, so TS knows array type:

const plotDataTemp: Array<trainInfo> = [
    {
      name: "train_1",
      x: data.filtrationData.map((i: any) => i["1-CumVol"]),
      y: data.filtrationData.map((i: any) => i["1-PressureA"]),
      type: "scatter",
      mode: "lines"
    },
    // ...
}

Then filter:

const plotData = plotDataTemp.filter(({ name }) => plotOptions[name]);

If you're getting data from API and have no way to type check props at compile time the only way is to add index signature to your plotOptions:

type tplotOptions = {
    [key: string]: boolean
}

const plotOptions: tplotOptions = {
    train_1: true,
    train_2: true,
    train_3: true,
    train_4: true
}

Adding Git-Bash to the new Windows Terminal

Because most answers either show a lot of unrelated configuration or don't show the configuration, I created my own answer that tries to be more focused. It is mainly based on the profile settings reference and Archimedes Trajano's answer.

Steps

Open PowerShell and enter [guid]::NewGuid() to generate a new GUID. We will use it at step 3.
```
> [guid]::NewGuid()

Guid
----
a3da8d92-2f3f-4e36-9714-98876b6cb480
```
Open the settings of Windows Terminal. (CTRL+,)

Add the following JSON object to profiles.list. Replace guid with the one you generated at step 1.

{
  "guid": "{a3da8d92-2f3f-4e36-9714-98876b6cb480}",
  "name": "Git Bash",
  "commandline": "\"%PROGRAMFILES%\\Git\\usr\\bin\\bash.exe\" -i -l",
  "icon": "%PROGRAMFILES%\\Git\\mingw64\\share\\git\\git-for-windows.ico",
  "startingDirectory" : "%USERPROFILE%"
},

Notes

There is currently an issue that you cannot use your arrow keys (and some other keys). It seems to work with the latest preview version, though. (issue #6859)
Specifying "startingDirectory" : "%USERPROFILE%" shouldn't be necessary according to the reference. However, if I don't specify it, the starting directory was different depending on how I started the terminal initially.
Settings that shall apply to all terminals can be specified in profiles.defaults.
I recommend to set "antialiasingMode": "cleartype" in profiles.defaults. You have to remove "useAcrylic" (if you have added it as suggested by some other answers) to make it work. It improves the quality of text rendering. However, you cannot have transparent background without useAcrylic. See issue #1298.
If you have problems with the cursor, you can try another shape like "cursorShape": "filledBox". See cursor settings for more information.

Typescript: No index signature with a parameter of type 'string' was found on type '{ "A": string; }

Don't Use Any, Use Generics

// bad
const _getKeyValue = (key: string) => (obj: object) => obj[key];
    
// better
const _getKeyValue_ = (key: string) => (obj: Record<string, any>) => obj[key];
    
// best
const getKeyValue = <T extends object, U extends keyof T>(key: U) => (obj: T) =>
      obj[key];

Bad - the reason for the error is the object type is just an empty object by default. Therefore it isn't possible to use a string type to index {}.

Better - the reason the error disappears is because now we are telling the compiler the obj argument will be a collection of string/value (string/any) pairs. However, we are using the any type, so we can do better.

Best - T extends empty object. U extends the keys of T. Therefore U will always exist on T, therefore it can be used as a look up value.

Here is a full example:

I have switched the order of the generics (U extends keyof T now comes before T extends object) to highlight that order of generics is not important and you should select an order that makes the most sense for your function.

const getKeyValue = <U extends keyof T, T extends object>(key: U) => (obj: T) =>
  obj[key];

interface User {
  name: string;
  age: number;
}

const user: User = {
  name: "John Smith",
  age: 20
};

const getUserName = getKeyValue<keyof User, User>("name")(user);

// => 'John Smith'

Alternative syntax

const getKeyValue = <T, K extends keyof T>(obj: T, key: K): T[K] => obj[key];

How to fix 'Object arrays cannot be loaded when allow_pickle=False' for imdb.load_data() function?

What I have found is that TensorFlow 2.0 (I am using 2.0.0-alpha0) is not compatible with the latest version of Numpy i.e. v1.17.0 (and possibly v1.16.5+). As soon as TF2 is imported, it throws a huge list of FutureWarning, that looks something like this:

FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint8 = np.dtype([("qint8", np.int8, 1)])
/anaconda3/lib/python3.6/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:541: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint8 = np.dtype([("qint8", np.int8, 1)])
/anaconda3/lib/python3.6/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:542: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_quint8 = np.dtype([("quint8", np.uint8, 1)])
/anaconda3/lib/python3.6/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:543: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.

This also resulted in the allow_pickle error when tried to load imdb dataset from keras

I tried to use the following solution which worked just fine, but I had to do it every single project where I was importing TF2 or tf.keras.

np.load = lambda *a,**k: np_load_old(*a, allow_pickle=True, **k)

The easiest solution I found was to either install numpy 1.16.1 globally, or use compatible versions of tensorflow and numpy in a virtual environment.

My goal with this answer is to point out that its not just a problem with imdb.load_data, but a larger problem vaused by incompatibility of TF2 and Numpy versions and may result in many other hidden bugs or issues.

How to fix missing dependency warning when using useEffect React Hook?

./src/components/BusinessesList.js
Line 51:  React Hook useEffect has a missing dependency: 'fetchBusinesses'.
Either include it or remove the dependency array  react-hooks/exhaustive-deps

It's not JS/React error but eslint (eslint-plugin-react-hooks) warning.

It's telling you that hook depends on function fetchBusinesses, so you should pass it as dependency.

useEffect(() => {
  fetchBusinesses();
}, [fetchBusinesses]);

It could result in invoking function every render if function is declared in component like:

const Component = () => {
  /*...*/

  //new function declaration every render
  const fetchBusinesses = () => {
    fetch('/api/businesses/')
      .then(...)
  }

  useEffect(() => {
    fetchBusinesses();
  }, [fetchBusinesses]);

  /*...*/
}

because every time function is redeclared with new reference

Correct way of doing this stuff is:

const Component = () => {
  /*...*/

  // keep function reference
  const fetchBusinesses = useCallback(() => {
    fetch('/api/businesses/')
      .then(...)
  }, [/* additional dependencies */]) 

  useEffect(() => {
    fetchBusinesses();
  }, [fetchBusinesses]);

  /*...*/
}

or just defining function in useEffect

More: https://github.com/facebook/react/issues/14920

How to set value to form control in Reactive Forms in Angular

Try this.

editqueForm =  this.fb.group({
   user: [this.question.user],
   questioning: [this.question.questioning, Validators.required],
   questionType: [this.question.questionType, Validators.required],
   options: new FormArray([])
})

setValue() and patchValue()

if you want to set the value of one control, this will not work, therefor you have to set the value of both controls:

formgroup.setValue({name: ‘abc’, age: ‘25’});

It is necessary to mention all the controls inside the method. If this is not done, it will throw an error.

On the other hand patchvalue() is a lot easier on that part, let’s say you only want to assign the name as a new value:

formgroup.patchValue({name:’abc’});

Push method in React Hooks (useState)?

setTheArray([...theArray, newElement]); is the simplest answer but be careful for the mutation of items in theArray. Use deep cloning of array items.

Typescript: Type X is missing the following properties from type Y length, pop, push, concat, and 26 more. [2740]

This error could also be because you are not subscribing to the Observable.

Example, instead of:

this.products = this.productService.getProducts();

do this:

   this.productService.getProducts().subscribe({
    next: products=>this.products = products,
    error: err=>this.errorMessage = err
   });

OpenCV TypeError: Expected cv::UMat for argument 'src' - What is this?

src is the first argument to cv2.cvtColor.

The error you are getting is because it is not the right form. cv2.Umat() is functionally equivalent to np.float32(), so your last line of code should read:

gray = cv2.cvtColor(np.float32(imgUMat), cv2.COLOR_RGB2GRAY)

useState set method not reflecting change immediately

You can solve it by using the useRef hook but then it's will not re-render when it' updated. I have created a hooks called useStateRef, that give you the good from both worlds. It's like a state that when it's updated the Component re-render, and it's like a "ref" that always have the latest value.

See this example:

var [state,setState,ref]=useStateRef(0)

It works exactly like useState but in addition, it gives you the current state under ref.current

Learn more:

https://www.npmjs.com/package/react-usestateref

React hooks useState Array

Try to keep your state minimal. There is no need to store

   const initialValue = [
    { id: 0,value: " --- Select a State ---" }];

as state. Separate the permanent from the changing

const ALL_STATE_VALS = [
    { id: 0,value: " --- Select a State ---" }
    { id: 1, value: "Alabama" },
    { id: 2, value: "Georgia" },
    { id: 3, value: "Tennessee" }
];

Then you can store just the id as your state:

const StateSelector = () =>{
  const [selectedStateOption, setselectedStateOption] = useState(0);

  return (
    <div>
      <label>Select a State:</label>
      <select>
        {ALL_STATE_VALS.map((option, index) => (
          <option key={option.id} selected={index===selectedStateOption}>{option.value}</option>
        ))}
      </select>
    </div>);
   )
}

Why do I keep getting Delete 'cr' [prettier/prettier]?

change this setting on VSCode.

Numpy, multiply array with scalar

You can multiply numpy arrays by scalars and it just works.

>>> import numpy as np
>>> np.array([1, 2, 3]) * 2
array([2, 4, 6])
>>> np.array([[1, 2, 3], [4, 5, 6]]) * 2
array([[ 2,  4,  6],
       [ 8, 10, 12]])

This is also a very fast and efficient operation. With your example:

>>> a_1 = np.array([1.0, 2.0, 3.0])
>>> a_2 = np.array([[1., 2.], [3., 4.]])
>>> b = 2.0
>>> a_1 * b
array([2., 4., 6.])
>>> a_2 * b
array([[2., 4.],
       [6., 8.]])

Objects are not valid as a React child. If you meant to render a collection of children, use an array instead

Had the same issue, In my case I had 1. Parse the string into Json 2. Ensure that when I render my view does not try to display the whole object, but object.value

data = [
{
    "id": 1,
    "name": "Home Page",
    "info": "This little bit of info is being loaded from a Rails 
    API.",
    "created_at": "2018-09-18T16:39:22.184Z",
    "updated_at": "2018-09-18T16:39:22.184Z"
}];
var jsonData = JSON.parse(data)

Then my view

return (
<View style={styles.container}>
  <FlatList
    data={jsonData}
    renderItem={({ item }) => <Item title={item.name} />}
    keyExtractor={item => item.id}
  />
</View>);

Because I'm using an array, I used flat list to display, and ensured I work with object.value, not object otherwise you'll get the same issue

Iterating over arrays in Python 3

You can use

    nditer

Here I calculated no. of positive and negative coefficients in a logistic regression:

b=sentiment_model.coef_
pos_coef=0
neg_coef=0
for i in np.nditer(b):
    if i>0:
    pos_coef=pos_coef+1
    else:
    neg_coef=neg_coef+1
print("no. of positive coefficients is : {}".format(pos_coef))
print("no. of negative coefficients is : {}".format(neg_coef))

Output:

no. of positive coefficients is : 85035
no. of negative coefficients is : 36199

Find the smallest positive integer that does not occur in a given sequence

in C#

static int solutionA(int[] A)
    {
        Array.Sort(A);

        int minNumber = 1;

        if(A.Max() < 0)
        {
            return minNumber;
        }

        for (int i = 0; i < A.Length; i++)
        {
            if (A[i] == minNumber)
            {
                minNumber++;
            }
            
            if (A[i] > minNumber)
            {
                break;
            }
        }

        return minNumber;
    }

100% Test Pass https://i.stack.imgur.com/FvPR8.png

Angular: How to download a file from HttpClient?

I ended up here when searching for ”rxjs download file using post”.

This was my final product. It uses the file name and type given in the server response.

import { ajax, AjaxResponse } from 'rxjs/ajax';
import { map } from 'rxjs/operators';

downloadPost(url: string, data: any) {
    return ajax({
        url: url,
        method: 'POST',
        responseType: 'blob',
        body: data,
        headers: {
            'Content-Type': 'application/json',
            'Accept': 'text/plain, */*',
            'Cache-Control': 'no-cache',
        }
    }).pipe(
        map(handleDownloadSuccess),
    );
}


handleDownloadSuccess(response: AjaxResponse) {
    const downloadLink = document.createElement('a');
    downloadLink.href = window.URL.createObjectURL(response.response);

    const disposition = response.xhr.getResponseHeader('Content-Disposition');
    if (disposition) {
        const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
        const matches = filenameRegex.exec(disposition);
        if (matches != null && matches[1]) {
            const filename = matches[1].replace(/['"]/g, '');
            downloadLink.setAttribute('download', filename);
        }
    }

    document.body.appendChild(downloadLink);
    downloadLink.click();
    document.body.removeChild(downloadLink);
}

Best way to "push" into C# array

As said before, List provides functionality to add elements in a clean way, to do the same with arrays, you have to resize them to accomodate extra elements, see code below:

int[] arr = new int[2];
arr[0] = 1;
arr[1] = 2;
//without this line we'd get a exception
Array.Resize(ref arr, 3);
arr[2] = 3;

Regarding your idea with loop:

elements of an array are set to their default values when array is initialized. So your approach would be good, if you want to fill "blanks" in array holding reference types (which have default value null).

But it wouldn't work with value types, as they are initialized with 0!

Sort Array of object by object field in Angular 6

Not tested but should work

 products.sort((a,b)=>a.title.rendered > b.title.rendered)

Uncaught SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>)

Remove this line from your code:

console.info(JSON.parse(scatterSeries));

TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array

Perhaps the error message is somewhat misleading, but the gist is that X_train is a list, not a numpy array. You cannot use array indexing on it. Make it an array first:

out_images = np.array(X_train)[indices.astype(int)]

Pytorch tensor to numpy array

You can use this syntax if some grads are attached with your variables.

y=torch.Tensor.cpu(x).detach().numpy()[:,:,:,-1]

Checking for duplicate strings in JavaScript array

Use object keys for good performance when you work with a big array (in that case, loop for each element and loop again to check duplicate will be very slowly).

var strArray = ["q", "w", "w", "e", "i", "u", "r"];

var counting = {};
strArray.forEach(function (str) {
    counting[str] = (counting[str] || 0) + 1;
});

if (Object.keys(counting).length !== strArray.length) {
    console.log("Has duplicates");

    var str;
    for (str in counting) {
        if (counting.hasOwnProperty(str)) {
            if (counting[str] > 1) {
                console.log(str + " appears " + counting[str] + " times");
            }
        }
    }
}

After Spring Boot 2.0 migration: jdbcUrl is required with driverClassName

Others have answered so I'll add my 2-cents.

You can either use autoconfiguration (i.e. don't use a @Configuration to create a datasource) or java configuration.

Auto-configuration:

define your datasource type then set the type properties. E.g.

spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.driver-class-name=org.h2.Driver
spring.datasource.hikari.jdbc-url=jdbc:h2:mem:testdb
spring.datasource.hikari.username=sa
spring.datasource.hikari.password=password
spring.datasource.hikari.max-wait=10000
spring.datasource.hikari.connection-timeout=30000
spring.datasource.hikari.idle-timeout=600000
spring.datasource.hikari.max-lifetime=1800000
spring.datasource.hikari.leak-detection-threshold=600000
spring.datasource.hikari.maximum-pool-size=100
spring.datasource.hikari.pool-name=MyDataSourcePoolName

Java configuration:

Choose a prefix and define your data source

spring.mysystem.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.mysystem.datasource.jdbc- 
url=jdbc:sqlserver://databaseserver.com:18889;Database=MyDatabase;
spring.mysystem.datasource.username=dsUsername
spring.mysystem.datasource.password=dsPassword
spring.mysystem.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.mysystem.datasource.max-wait=10000
spring.mysystem.datasource.connection-timeout=30000
spring.mysystem.datasource.idle-timeout=600000
spring.mysystem.datasource.max-lifetime=1800000
spring.mysystem.datasource.leak-detection-threshold=600000
spring.mysystem.datasource.maximum-pool-size=100
spring.mysystem.datasource.pool-name=MySystemDatasourcePool

Create your datasource bean:

@Bean(name = { "dataSource", "mysystemDataSource" })
@ConfigurationProperties(prefix = "spring.mysystem.datasource")
public DataSource dataSource() {
    return DataSourceBuilder.create().build();
}

You can leave the datasource type out, but then you risk spring guessing what datasource type to use.

Failed linking file resources

It is a xml error for some reason may be because of deleting a view or string in another view or may be for missing " or /> ..... etc

But here I am using a good technique to figure out where is the problem exactly :-

Go to every single xml file and minimize the root element if you find something like this so you got where is the error, fix it then repeat the process for all files.
If the file has an error you will see three dots with red color
Fix the error here I removed this line because this array is not in the string file any more.
Now you can see there is no error in this file any more if you still got the main error so you have to repeat this process again to all xml files until you solve the error

I know it is not the solution of the main problem but it will make you find where is the error quickly and save you time.

Update

There is another way you can find out easily, as Bennik2000 write in comment, you can look at the right scrollbar for red lines, they also indicate errors.

Update

I found a very simple way to get where is the error exactly if it is in resource file or even java file.
1- Go to Project Window.
2- Open the file that has the error.
3- Click F2 to go to the nearest error appears (it will go to the correct line)

PackagesNotFoundError: The following packages are not available from current channels:

Thanks, Max S. conda-forge worked for me as well.

scikit-learn on Anaconda-Jupyter Notebook.

Upgrading my scikit-learn from 0.19.1 to 0.19.2 in anaconda installed on Ubuntu on Google VM instance:

Run the following commands in the terminal:

First, check available the packages with versions

conda list

It will show packages and their installed versions in the output:

scikit-learn              0.19.1           py36hedc7406_0

Upgrade to 0.19.2 July 2018 release.

conda config --append channels conda-forge
conda install scikit-learn=0.19.2

Now check the version installed correctly or not?

conda list

Output is:

scikit-learn              0.19.2          py36_blas_openblasha84fab4_201  [blas_openblas]  conda-forge

Note: Don't use pip command if you are using Anaconda or Miniconda

I tried following commands:

!conda update conda 
!pip install -U scikit-learn

It will install the required packages also will show in the conda list but when try to import that package it will not work.

On the website http://scikit-learn.org/stable/install.html it is mentioned as: Warning To upgrade or uninstall scikit-learn installed with Anaconda or conda you should not use the pip.

ReferenceError: fetch is not defined

Might sound silly but I simply called npm i node-fetch --save in the wrong project. Make sure you are in the correct directory.

Numpy Resize/Rescale Image

Yeah, you can install opencv (this is a library used for image processing, and computer vision), and use the cv2.resize function. And for instance use:

import cv2
import numpy as np

img = cv2.imread('your_image.jpg')
res = cv2.resize(img, dsize=(54, 140), interpolation=cv2.INTER_CUBIC)

Here img is thus a numpy array containing the original image, whereas res is a numpy array containing the resized image. An important aspect is the interpolation parameter: there are several ways how to resize an image. Especially since you scale down the image, and the size of the original image is not a multiple of the size of the resized image. Possible interpolation schemas are:

INTER_NEAREST - a nearest-neighbor interpolation

INTER_LINEAR - a bilinear interpolation (used by default)

INTER_AREA - resampling using pixel area relation. It may be a preferred method for image decimation, as it gives moire’-free results. But when the image is zoomed, it is similar to the INTER_NEAREST method.

INTER_CUBIC - a bicubic interpolation over 4x4 pixel neighborhood

INTER_LANCZOS4 - a Lanczos interpolation over 8x8 pixel neighborhood

Like with most options, there is no "best" option in the sense that for every resize schema, there are scenarios where one strategy can be preferred over another.

phpmyadmin - count(): Parameter must be an array or an object that implements Countable

If someone have similar error in DB export page (I had this issue in Ubuntu 18.04), then replace line 551 in file /usr/share/phpmyadmin/libraries/plugin_interface.lib.php with code

if ($options != null && (is_array($options) || $options instanceof Countable) && count($options) > 0) {

JS map return object

If you want to alter the original objects, then a simple Array#forEach will do:

rockets.forEach(function(rocket) {
    rocket.launches += 10;
});

If you want to keep the original objects unaltered, then use Array#map and copy the objects using Object#assign:

var newRockets = rockets.forEach(function(rocket) {
    var newRocket = Object.assign({}, rocket);
    newRocket.launches += 10;
    return newRocket;
});

forEach() in React JSX does not output any HTML

You need to pass an array of element to jsx. The problem is that forEach does not return anything (i.e it returns undefined). So it's better to use map because map returns an array:

class QuestionSet extends Component {
render(){ 
    <div className="container">
       <h1>{this.props.question.text}</h1>
       {this.props.question.answers.map((answer, i) => {     
           console.log("Entered");                 
           // Return the element. Also pass key     
           return (<Answer key={answer} answer={answer} />) 
        })}
}

export default QuestionSet;

what does numpy ndarray shape do?

yourarray.shape or np.shape() or np.ma.shape() returns the shape of your ndarray as a tuple; And you can get the (number of) dimensions of your array using yourarray.ndim or np.ndim(). (i.e. it gives the n of the ndarray since all arrays in NumPy are just n-dimensional arrays (shortly called as ndarrays))

For a 1D array, the shape would be (n,) where n is the number of elements in your array.

For a 2D array, the shape would be (n,m) where n is the number of rows and m is the number of columns in your array.

Please note that in 1D case, the shape would simply be (n, ) instead of what you said as either (1, n) or (n, 1) for row and column vectors respectively.

This is to follow the convention that:

For 1D array, return a shape tuple with only 1 element (i.e. (n,))
For 2D array, return a shape tuple with only 2 elements (i.e. (n,m))
For 3D array, return a shape tuple with only 3 elements (i.e. (n,m,k))
For 4D array, return a shape tuple with only 4 elements (i.e. (n,m,k,j))

and so on.

Also, please see the example below to see how np.shape() or np.ma.shape() behaves with 1D arrays and scalars:

# sample array
In [10]: u = np.arange(10)

# get its shape
In [11]: np.shape(u)    # u.shape
Out[11]: (10,)

# get array dimension using `np.ndim`
In [12]: np.ndim(u)
Out[12]: 1

In [13]: np.shape(np.mean(u))
Out[13]: ()       # empty tuple (to indicate that a scalar is a 0D array).

# check using `numpy.ndim`
In [14]: np.ndim(np.mean(u))
Out[14]: 0

P.S.: So, the shape tuple is consistent with our understanding of dimensions of space, at least mathematically.

Angular Material: mat-select not selecting default

As already mentioned in Angular 6 using ngModel in reactive forms is deprecated (and removed in Angular 7), so I modified the template and the component as following.

The template:

<mat-form-field>
    <mat-select [formControl]="filter" multiple 
                [compareWith]="compareFn">
        <mat-option *ngFor="let v of values" [value]="v">{{v.label}}</mat-option>
    </mat-select>
</mat-form-field>

The main parts of the component (onChanges and other details are omitted):

interface SelectItem {
    label: string;
    value: any;
}

export class FilterComponent implements OnInit {
    filter = new FormControl();

    @Input
    selected: SelectItem[] = [];

    @Input()
    values: SelectItem[] = [];

    constructor() { }

    ngOnInit() {
        this.filter.setValue(this.selected);
    }

    compareFn(v1: SelectItem, v2: SelectItem): boolean {
        return compareFn(v1, v2);
    }
}

function compareFn(v1: SelectItem, v2: SelectItem): boolean {
    return v1 && v2 ? v1.value === v2.value : v1 === v2;
}

Note this.filter.setValue(this.selected) in ngOnInit above.

It seems to work in Angular 6.

Add items in array angular 4

Yes there is a way to do it.

First declare a class.

//anyfile.ts
export class Custom
{
  name: string, 
  empoloyeeID: number
}

Then in your component import the class

import {Custom} from '../path/to/anyfile.ts'
.....
export class FormComponent implements OnInit {
 name: string;
 empoloyeeID : number;
 empList: Array<Custom> = [];
 constructor() {

 }

 ngOnInit() {
 }
 onEmpCreate(){
   //console.log(this.name,this.empoloyeeID);
   let customObj = new Custom();
   customObj.name = "something";
   customObj.employeeId = 12; 
   this.empList.push(customObj);
   this.name ="";
   this.empoloyeeID = 0; 
 }
}

Another way would be to interfaces read the documentation once - https://www.typescriptlang.org/docs/handbook/interfaces.html

Also checkout this question, it is very interesting - When to use Interface and Model in TypeScript / Angular2

How to round a numpy array?

It is worth noting that the accepted answer will round small floats down to zero.

>>> import numpy as np 
>>> arr = np.asarray([2.92290007e+00, -1.57376965e-03, 4.82011728e-08, 1.92896977e-12])
>>> print(arr)
[ 2.92290007e+00 -1.57376965e-03  4.82011728e-08  1.92896977e-12]
>>> np.round(arr, 2)
array([ 2.92, -0.  ,  0.  ,  0.  ])

You can use set_printoptions and a custom formatter to fix this and get a more numpy-esque printout with fewer decimal places:

>>> np.set_printoptions(formatter={'float': "{0:0.2e}".format})
>>> print(arr)
[2.92e+00 -1.57e-03 4.82e-08 1.93e-12]

This way, you get the full versatility of format and maintain the full precision of numpy's datatypes.

Also note that this only affects printing, not the actual precision of the stored values used for computation.

How to import JSON File into a TypeScript file?

Angular 10

You should now edit the tsconfig.app.json (notice the "app" in the name) file instead.

There you'll find the compilerOptions, and you simply add resolveJsonModule: true.

So, for example, the file in a brand new project should look like this:

/* To learn more about this file see: https://angular.io/config/tsconfig. */
{
  "extends": "./tsconfig.base.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
    "types": [],
    "resolveJsonModule": true
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ]
}

numpy array TypeError: only integer scalar arrays can be converted to a scalar index

This could be unrelated to this specific problem, but I ran into a similar issue where I used NumPy indexing on a Python list and got the same exact error message:

# incorrect
weights = list(range(1, 129)) + list(range(128, 0, -1))
mapped_image = weights[image[:, :, band]] # image.shape = [800, 600, 3]
# TypeError: only integer scalar arrays can be converted to a scalar index

It turns out I needed to turn weights, a 1D Python list, into a NumPy array before I could apply multi-dimensional NumPy indexing. The code below works:

# correct
weights = np.array(list(range(1, 129)) + list(range(128, 0, -1)))
mapped_image = weights[image[:, :, band]] # image.shape = [800, 600, 3]

Merge two array of objects based on a key

This solution is applicable even when you have different size of array being merged. Also, even if the keys on which match is happening has a different name.

const arr1 = [
  { id: "abdc4051", date: "2017-01-24" }, 
  { id: "abdc4052", date: "2017-01-22" },
  { id: "abdc4053", date: "2017-01-22" }
];
const arr2 = [
  { nameId: "abdc4051", name: "ab" },
  { nameId: "abdc4052", name: "abc" }
];

Now to merge these use a Map as follows:

const map = new Map();
arr1.forEach(item => map.set(item.id, item));
arr2.forEach(item => map.set(item.nameId, {...map.get(item.nameId), ...item}));
const mergedArr = Array.from(map.values());

This should result in:

[
  {
    "id": "abdc4051",
    "date": "2017-01-24",
    "nameId": "abdc4051",
    "name": "ab"
  },
  {
    "id": "abdc4052",
    "date": "2017-01-22",
    "nameId": "abdc4052",
    "name": "abc"
  },
  {
    "id": "abdc4053",
    "date": "2017-01-22"
  }
]

How to update an "array of objects" with Firestore?

addToCart(docId: string, prodId: string): Promise<void> {
    return this.baseAngularFirestore.collection('carts').doc(docId).update({
        products:
        firestore.FieldValue.arrayUnion({
            productId: prodId,
            qty: 1
        }),
    });
}

Use Async/Await with Axios in React.js

Two issues jump out:

Your getData never returns anything, so its promise (async functions always return a promise) will resolve with undefined when it resolves
The error message clearly shows you're trying to directly render the promise getData returns, rather than waiting for it to resolve and then rendering the resolution

Addressing #1: getData should return the result of calling json:

async getData(){
   const res = await axios('/data');
   return await res.json();
}

Addressig #2: We'd have to see more of your code, but fundamentally, you can't do

<SomeElement>{getData()}</SomeElement>

...because that doesn't wait for the resolution. You'd need instead to use getData to set state:

this.getData().then(data => this.setState({data}))
              .catch(err => { /*...handle the error...*/});

...and use that state when rendering:

<SomeElement>{this.state.data}</SomeElement>

Update: Now that you've shown us your code, you'd need to do something like this:

class App extends React.Component{
    async getData() {
        const res = await axios('/data');
        return await res.json(); // (Or whatever)
    }
    constructor(...args) {
        super(...args);
        this.state = {data: null};
    }
    componentDidMount() {
        if (!this.state.data) {
            this.getData().then(data => this.setState({data}))
                          .catch(err => { /*...handle the error...*/});
        }
    }
    render() {
        return (
            <div>
                {this.state.data ? <em>Loading...</em> : this.state.data}
            </div>
        );
    }
}

Futher update: You've indicated a preference for using await in componentDidMount rather than then and catch. You'd do that by nesting an async IIFE function within it and ensuring that function can't throw. (componentDidMount itself can't be async, nothing will consume that promise.) E.g.:

class App extends React.Component{
    async getData() {
        const res = await axios('/data');
        return await res.json(); // (Or whatever)
    }
    constructor(...args) {
        super(...args);
        this.state = {data: null};
    }
    componentDidMount() {
        if (!this.state.data) {
            (async () => {
                try {
                    this.setState({data: await this.getData()});
                } catch (e) {
                    //...handle the error...
                }
            })();
        }
    }
    render() {
        return (
            <div>
                {this.state.data ? <em>Loading...</em> : this.state.data}
            </div>
        );
    }
}

Convert np.array of type float64 to type uint8 scaling values

A better way to normalize your image is to take each value and divide by the largest value experienced by the data type. This ensures that images that have a small dynamic range in your image remain small and they're not inadvertently normalized so that they become gray. For example, if your image had a dynamic range of [0-2], the code right now would scale that to have intensities of [0, 128, 255]. You want these to remain small after converting to np.uint8.

Therefore, divide every value by the largest value possible by the image type, not the actual image itself. You would then scale this by 255 to produced the normalized result. Use numpy.iinfo and provide it the type (dtype) of the image and you will obtain a structure of information for that type. You would then access the max field from this structure to determine the maximum value.

So with the above, do the following modifications to your code:

import numpy as np
import cv2
[...]
info = np.iinfo(data.dtype) # Get the information of the incoming image type
data = data.astype(np.float64) / info.max # normalize the data to 0 - 1
data = 255 * data # Now scale by 255
img = data.astype(np.uint8)
cv2.imshow("Window", img)

Note that I've additionally converted the image into np.float64 in case the incoming data type is not so and to maintain floating-point precision when doing the division.

Please add a @Pipe/@Directive/@Component annotation. Error

In my case I mistakenly added this:

@Component({
    selector: 'app-some-item',
    templateUrl: './some-item.component.html',
    styleUrls: ['./some-item.component.scss'],
    providers: [ConfirmationService]
})

declare var configuration: any;

while the correct form is:

declare var configuration: any;

@Component({
    selector: 'app-some-item',
    templateUrl: './some-item.component.html',
    styleUrls: ['./some-item.component.scss'],
    providers: [ConfirmationService]
})

Laravel 5.5 ajax call 419 (unknown status)

formData = new FormData();
formData.append('_token', "{{csrf_token()}}");
formData.append('file', blobInfo.blob(), blobInfo.filename());
xhr.send(formData);

Angular HttpClient "Http failure during parsing"

Even adding responseType, I dealt with it for days with no success. Finally I got it. Make sure that in your backend script you don't define header as -("Content-Type: application/json);

Becuase if you turn it to text but backend asks for json, it will return an error...

LabelEncoder: TypeError: '>' not supported between instances of 'float' and 'str'

As string data types have variable length, it is by default stored as object type. I faced this problem after treating missing values too. Converting all those columns to type 'category' before label encoding worked in my case.

df[cat]=df[cat].astype('category')

And then check df.dtypes and perform label encoding.

How to add an item to an ArrayList in Kotlin?

If you want to specifically use java ArrayList then you can do something like this:

fun initList(){
    val list: ArrayList<String> = ArrayList()
    list.add("text")
    println(list)
}

Otherwise @guenhter answer is the one you are looking for.

Iterate over array of objects in Typescript

In Typescript and ES6 you can also use for..of:

for (var product of products) {
     console.log(product.product_desc)
}

which will be transcoded to javascript:

for (var _i = 0, products_1 = products; _i < products_1.length; _i++) {
    var product = products_1[_i];
    console.log(product.product_desc);
}

"The page has expired due to inactivity" - Laravel 5.5

Solution:

use incognito new tab then test it again.

reason:

in my case another user logged in with my admin panel

How to increment a letter N times per iteration and store in an array?

ord() will not work because your end string is two characters long.

Returns the ASCII value of the first character of string.

Watch it break.

From my testing, you need to check that the end string doesn't get "stepped over". The perl-style character incrementation is a cool method, but it is a single-stepping method. For this reason, an inner loop helps it along when necessary. This is actually not a bother, in fact, it is useful because we need to check if the loop(s) should be broken on each single step.

Code: (Demo)

function excelCols($letter,$end,$step=1){  // function doesn't check that $end is "later" than $letter
    if($step==0)return [];  // prevent infinite loop
    do{
        $letters[]=$letter;  // store letter
        for($x=0; $x<$step; ++$x){  // increment in accordance with $step declaration
            if($letter===$end)break(2);  // break if end is "stepped on"
            ++$letter;
        }
    }while(true);
    return $letters;    
}
echo implode(' ',excelCols('A','JJ',4));
echo "\n --- \n";
echo implode(' ',excelCols('A','BB',3));
echo "\n --- \n";
echo implode(' ',excelCols('A','ZZ',1));
echo "\n --- \n";
echo implode(' ',excelCols('A','ZZ',3));

Output:

A E I M Q U Y AC AG AK AO AS AW BA BE BI BM BQ BU BY CC CG CK CO CS CW DA DE DI DM DQ DU DY EC EG EK EO ES EW FA FE FI FM FQ FU FY GC GG GK GO GS GW HA HE HI HM HQ HU HY IC IG IK IO IS IW JA JE JI
 --- 
A D G J M P S V Y AB AE AH AK AN AQ AT AW AZ
 --- 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DY DZ EA EB EC ED EE EF EG EH EI EJ EK EL EM EN EO EP EQ ER ES ET EU EV EW EX EY EZ FA FB FC FD FE FF FG FH FI FJ FK FL FM FN FO FP FQ FR FS FT FU FV FW FX FY FZ GA GB GC GD GE GF GG GH GI GJ GK GL GM GN GO GP GQ GR GS GT GU GV GW GX GY GZ HA HB HC HD HE HF HG HH HI HJ HK HL HM HN HO HP HQ HR HS HT HU HV HW HX HY HZ IA IB IC ID IE IF IG IH II IJ IK IL IM IN IO IP IQ IR IS IT IU IV IW IX IY IZ JA JB JC JD JE JF JG JH JI JJ JK JL JM JN JO JP JQ JR JS JT JU JV JW JX JY JZ KA KB KC KD KE KF KG KH KI KJ KK KL KM KN KO KP KQ KR KS KT KU KV KW KX KY KZ LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NW NX NY NZ OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OO OP OQ OR OS OT OU OV OW OX OY OZ PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ QA QB QC QD QE QF QG QH QI QJ QK QL QM QN QO QP QQ QR QS QT QU QV QW QX QY QZ RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ TA TB TC TD TE TF TG TH TI TJ TK TL TM TN TO TP TQ TR TS TT TU TV TW TX TY TZ UA UB UC UD UE UF UG UH UI UJ UK UL UM UN UO UP UQ UR US UT UU UV UW UX UY UZ VA VB VC VD VE VF VG VH VI VJ VK VL VM VN VO VP VQ VR VS VT VU VV VW VX VY VZ WA WB WC WD WE WF WG WH WI WJ WK WL WM WN WO WP WQ WR WS WT WU WV WW WX WY WZ XA XB XC XD XE XF XG XH XI XJ XK XL XM XN XO XP XQ XR XS XT XU XV XW XX XY XZ YA YB YC YD YE YF YG YH YI YJ YK YL YM YN YO YP YQ YR YS YT YU YV YW YX YY YZ ZA ZB ZC ZD ZE ZF ZG ZH ZI ZJ ZK ZL ZM ZN ZO ZP ZQ ZR ZS ZT ZU ZV ZW ZX ZY ZZ
 --- 
A D G J M P S V Y AB AE AH AK AN AQ AT AW AZ BC BF BI BL BO BR BU BX CA CD CG CJ CM CP CS CV CY DB DE DH DK DN DQ DT DW DZ EC EF EI EL EO ER EU EX FA FD FG FJ FM FP FS FV FY GB GE GH GK GN GQ GT GW GZ HC HF HI HL HO HR HU HX IA ID IG IJ IM IP IS IV IY JB JE JH JK JN JQ JT JW JZ KC KF KI KL KO KR KU KX LA LD LG LJ LM LP LS LV LY MB ME MH MK MN MQ MT MW MZ NC NF NI NL NO NR NU NX OA OD OG OJ OM OP OS OV OY PB PE PH PK PN PQ PT PW PZ QC QF QI QL QO QR QU QX RA RD RG RJ RM RP RS RV RY SB SE SH SK SN SQ ST SW SZ TC TF TI TL TO TR TU TX UA UD UG UJ UM UP US UV UY VB VE VH VK VN VQ VT VW VZ WC WF WI WL WO WR WU WX XA XD XG XJ XM XP XS XV XY YB YE YH YK YN YQ YT YW YZ ZC ZF ZI ZL ZO ZR ZU ZX

Here is an array-functions approach:

Code: (Demo)

$start='C';
$end='DD';
$step=4;

// generate and store more than we need (this is an obvious method disadvantage)
$result=$array=range('A','Z',1);  // store A - Z as $array and $result
foreach($array as $a){
    foreach($array as $b){
        $result[]="$a$b";  // store double letter combinations
        if(in_array($end,$result)){break(2);}  // stop asap
    }
}
//echo implode(' ',$result),"\n\n";

// slice away from the front of the array
$result=array_slice($result,array_search($start,$result));  // reindex keys
//echo implode(' ',$result),"\n\n";

 // punch out elements that are not "stepped on"
$result=array_filter($result,function($k)use($step){return $k%$step==0;},ARRAY_FILTER_USE_KEY); // use modulo

// result is ready
echo implode(' ',$result);

Output:

C G K O S W AA AE AI AM AQ AU AY BC BG BK BO BS BW CA CE CI CM CQ CU CY DC

Property 'json' does not exist on type 'Object'

For future visitors: In the new HttpClient (Angular 4.3+), the response object is JSON by default, so you don't need to do response.json().data anymore. Just use response directly.

Example (modified from the official documentation):

import { HttpClient } from '@angular/common/http';

@Component(...)
export class YourComponent implements OnInit {

  // Inject HttpClient into your component or service.
  constructor(private http: HttpClient) {}

  ngOnInit(): void {
    this.http.get('https://api.github.com/users')
        .subscribe(response => console.log(response));
  }
}

Don't forget to import it and include the module under imports in your project's app.module.ts:

...
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    BrowserModule,
    // Include it under 'imports' in your application module after BrowserModule.
    HttpClientModule,
    ...
  ],
  ...

Counting unique values in a column in pandas dataframe like in Qlik?

Count distinct values, use nunique:

df['hID'].nunique()
5

Count only non-null values, use count:

df['hID'].count()
8

Count total values including null values, use the size attribute:

df['hID'].size
8

Edit to add condition

Use boolean indexing:

df.loc[df['mID']=='A','hID'].agg(['nunique','count','size'])

OR using query:

df.query('mID == "A"')['hID'].agg(['nunique','count','size'])

Output:

nunique    5
count      5
size       5
Name: hID, dtype: int64

Error in Python script "Expected 2D array, got 1D array instead:"?

With one feature my Dataframe list converts to a Series. I had to convert it back to a Dataframe list and it worked.

if type(X) is Series:
    X = X.to_frame()

Error: fix the version conflict (google-services plugin)

Initially, the firebase database was pointing to 11.8.0 .after changing all the related jars to 11.0.4 this issue is resolved at changes the SDK level.

compile 'com.google.firebase:firebase-database:11.0.4'
compile 'com.google.firebase:firebase-messaging:11.0.4'

Adding a HTTP header to the Angular HttpClient doesn't send the header, why?

Angular 8 HttpClient Service example with Error Handling and Custom Header

    import { Injectable } from '@angular/core';
    import { HttpClient, HttpHeaders, HttpErrorResponse } from '@angular/common/http';
    import { Student } from '../model/student';
    import { Observable, throwError } from 'rxjs';
    import { retry, catchError } from 'rxjs/operators';

    @Injectable({
      providedIn: 'root'
    })
    export class ApiService {

      // API path
      base_path = 'http://localhost:3000/students';

      constructor(private http: HttpClient) { }

      // Http Options
      httpOptions = {
        headers: new HttpHeaders({
          'Content-Type': 'application/json'
        })
      }

      // Handle API errors
      handleError(error: HttpErrorResponse) {
        if (error.error instanceof ErrorEvent) {
          // A client-side or network error occurred. Handle it accordingly.
          console.error('An error occurred:', error.error.message);
        } else {
          // The backend returned an unsuccessful response code.
          // The response body may contain clues as to what went wrong,
          console.error(
            `Backend returned code ${error.status}, ` +
            `body was: ${error.error}`);
        }
        // return an observable with a user-facing error message
        return throwError(
          'Something bad happened; please try again later.');
      };


      // Create a new item
      createItem(item): Observable<Student> {
        return this.http
          .post<Student>(this.base_path, JSON.stringify(item), this.httpOptions)
          .pipe(
            retry(2),
            catchError(this.handleError)
          )
      }

      ....
      ....

Check complete example tutorial here

laravel Unable to prepare route ... for serialization. Uses Closure

the solustion when we use routes like this:

Route::get('/', function () {
    return view('welcome');
});

laravel call them Closure so you cant optimize routes uses as Closures you must route to controller to use php artisan optimize

convert array into DataFrame in Python

In general you can use pandas rename function here. Given your dataframe you could change to a new name like this. If you had more columns you could also rename those in the dictionary. The 0 is the current name of your column

import pandas as pd    
import numpy as np   
e = np.random.normal(size=100)  
e_dataframe = pd.DataFrame(e)      

e_dataframe.rename(index=str, columns={0:'new_column_name'})

No String-argument constructor/factory method to deserialize from String value ('')

I found a different way to handle this error. (the variables is according to the original question)

   JsonNode parsedNodes = mapper.readValue(jsonMessage , JsonNode.class);
        Response response = xmlMapper.enable(ACCEPT_EMPTY_STRING_AS_NULL_OBJECT,ACCEPT_SINGLE_VALUE_AS_ARRAY )
                .disable(FAIL_ON_UNKNOWN_PROPERTIES, FAIL_ON_IGNORED_PROPERTIES)
                .convertValue(parsedNodes, Response.class);

Uncaught Error: Unexpected module 'FormsModule' declared by the module 'AppModule'. Please add a @Pipe/@Directive/@Component annotation

FormsModule should be added at imports array not declarations array.

imports array is for importing modules such as BrowserModule, FormsModule, HttpModule
declarations array is for your Components, Pipes, Directives

refer below change:

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})

How do I fix "Expected to return a value at the end of arrow function" warning?

The most upvoted answer, from Kris Selbekk, it is totally right. It is important to highlight though that it takes a functional approach, you will be looping through the this.props.comments array twice, the second time(looping) it will most probable skip a few elements that where filtered, but in case no comment was filtered you will loop through the whole array twice. If performance is not a concern in you project that is totally fine. In case performance is important a guard clause would be more appropriated as you would loop the array only once:

return this.props.comments.map((comment) => {
  if (!comment.hasComments) return null; 

  return (
    <div key={comment.id}>         
      <CommentItem className="MainComment"/>
        {this.props.comments.map(commentReply => {             
          if (commentReply.replyTo !== comment.id) return null;

          return <CommentItem className="SubComment"/>
        })} 
    </div>          
  ) 
}

The main reason I'm pointing this out is because as a Junior Developer I did a lot of those mistakes(like looping the same array multiple times), so I thought i was worth mention it here.

PS: I would refactor your react component even more, as I'm not in favour of heavy logic in the html part of a JSX, but that is out of the topic of this question.

How to convert Observable<any> to array[]

This should work:

GetCountries():Observable<CountryData[]>  {
  return this.http.get(`http://services.groupkt.com/country/get/all`)
    .map((res:Response) => <CountryData[]>res.json());
}

For this to work you will need to import the following:

import 'rxjs/add/operator/map'

Cloning an array in Javascript/Typescript

try the following code:

this.cloneArray= [...this.OriginalArray]

How to convert JSON string into List of Java object?

For any one who looks for answer yet:

1.Add jackson-databind library to your build tools like Gradle or Maven

2.in your Code:

ObjectMapper mapper = new ObjectMapper();

List<Student> studentList = new ArrayList<>();

studentList = Arrays.asList(mapper.readValue(jsonStringArray, Student[].class));

How to specify legend position in matplotlib in graph coordinates

In addition to @ImportanceOfBeingErnest's post, I use the following line to add a legend at an absolute position in a plot.

plt.legend(bbox_to_anchor=(1.0,1.0),\
    bbox_transform=plt.gcf().transFigure)

For unknown reasons, bbox_transform=fig.transFigure does not work with me.

What's the Kotlin equivalent of Java's String[]?

Those types are there so that you can create arrays of the primitives, and not the boxed types. Since String isn't a primitive in Java, you can just use Array<String> in Kotlin as the equivalent of a Java String[].

How to change a single value in a NumPy array?

Is this what you are after? Just index the element and assign a new value.

A[2,1]=150

A
Out[345]: 
array([[ 1,  2,  3,  4],
       [ 5,  6,  7,  8],
       [ 9, 150, 11, 12],
       [13, 14, 15, 16]])

RestClientException: Could not extract response. no suitable HttpMessageConverter found

Other possible solution : I tried to map the result of a restTemplate.getForObject with a private class instance (defined inside of my working class). It did not work, but if I define the object to public, inside its own file, it worked correctly.

Android Room - simple select query - Cannot access database on the main thread

With lambda its easy to run with AsyncTask

 AsyncTask.execute(() -> //run your query here );

TypeError: can't pickle _thread.lock objects

I had the same problem with Pool() in Python 3.6.3.

Error received: TypeError: can't pickle _thread.RLock objects

Let's say we want to add some number num_to_add to each element of some list num_list in parallel. The code is schematically like this:

class DataGenerator:
    def __init__(self, num_list, num_to_add)
        self.num_list = num_list # e.g. [4,2,5,7]
        self.num_to_add = num_to_add # e.g. 1 

        self.run()

    def run(self):
        new_num_list = Manager().list()

        pool = Pool(processes=50)
        results = [pool.apply_async(run_parallel, (num, new_num_list)) 
                      for num in num_list]
        roots = [r.get() for r in results]
        pool.close()
        pool.terminate()
        pool.join()

    def run_parallel(self, num, shared_new_num_list):
        new_num = num + self.num_to_add # uses class parameter
        shared_new_num_list.append(new_num)

The problem here is that self in function run_parallel() can't be pickled as it is a class instance. Moving this parallelized function run_parallel() out of the class helped. But it's not the best solution as this function probably needs to use class parameters like self.num_to_add and then you have to pass it as an argument.

Solution:

def run_parallel(num, shared_new_num_list, to_add): # to_add is passed as an argument
    new_num = num + to_add
    shared_new_num_list.append(new_num)

class DataGenerator:
    def __init__(self, num_list, num_to_add)
        self.num_list = num_list # e.g. [4,2,5,7]
        self.num_to_add = num_to_add # e.g. 1

        self.run()

    def run(self):
        new_num_list = Manager().list()

        pool = Pool(processes=50)
        results = [pool.apply_async(run_parallel, (num, new_num_list, self.num_to_add)) # num_to_add is passed as an argument
                      for num in num_list]
        roots = [r.get() for r in results]
        pool.close()
        pool.terminate()
        pool.join()

Other suggestions above didn't help me.

Angular update object in object array

updateValue(data){    
     // retriving index from array
     let indexValue = this.items.indexOf(data);
    // changing specific element in array
     this.items[indexValue].isShow =  !this.items[indexValue].isShow;
}

Jersey stopped working with InjectionManagerFactory not found

Jersey 2.26 and newer are not backward compatible with older versions. The reason behind that has been stated in the release notes:

Unfortunately, there was a need to make backwards incompatible changes in 2.26. Concretely jersey-proprietary reactive client API is completely gone and cannot be supported any longer - it conflicts with what was introduced in JAX-RS 2.1 (that's the price for Jersey being "spec playground..").

Another bigger change in Jersey code is attempt to make Jersey core independent of any specific injection framework. As you might now, Jersey 2.x is (was!) pretty tightly dependent on HK2, which sometimes causes issues (esp. when running on other injection containers. Jersey now defines it's own injection facade, which, when implemented properly, replaces all internal Jersey injection.

As for now one should use the following dependencies:

Maven

<dependency>
    <groupId>org.glassfish.jersey.inject</groupId>
    <artifactId>jersey-hk2</artifactId>
    <version>2.26</version>
</dependency>

Gradle

compile 'org.glassfish.jersey.core:jersey-common:2.26'
compile 'org.glassfish.jersey.inject:jersey-hk2:2.26'

Could not find com.android.tools.build:gradle:3.0.0-alpha1 in circle ci

For me I solved this error just by adding this line inside repository

maven { url 'https://maven.google.com' }

Angular: 'Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays'

Remember to pipe Observables to async, like *ngFor item of items$ | async, where you are trying to *ngFor item of items$ where items$ is obviously an Observable because you notated it with the $ similar to items$: Observable<IValuePair>, and your assignment may be something like this.items$ = this.someDataService.someMethod<IValuePair>() which returns an Observable of type T.

Adding to this... I believe I have used notation like *ngFor item of (items$ | async)?.someProperty

ValueError: could not broadcast input array from shape (224,224,3) into shape (224,224)

I was facing the same problem because some of the images are grey scale images in my data set, so i solve my problem by doing this

    from PIL import Image
    img = Image.open('my_image.jpg').convert('RGB')
    # a line from my program
    positive_images_array = np.array([np.array(Image.open(img).convert('RGB').resize((150, 150), Image.ANTIALIAS)) for img in images_in_yes_directory])

Get keys of a Typescript interface as array of strings

Maybe it's too late, but in version 2.1 of TypeScript you can use key of like this:

interface Person {
    name: string;
    age: number;
    location: string;
}

type K1 = keyof Person; // "name" | "age" | "location"
type K2 = keyof Person[];  // "length" | "push" | "pop" | "concat" | ...
type K3 = keyof { [x: string]: Person };  // string

Source: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-1.html#keyof-and-lookup-types

How to print a Groovy variable in Jenkins?

You shouldn't use ${varName} when you're outside of strings, you should just use varName. Inside strings you use it like this; echo "this is a string ${someVariable}";. Infact you can place an general java expression inside of ${...}; echo "this is a string ${func(arg1, arg2)}.

Check if value exists in enum in TypeScript

If you want to use the variable as enum, just add the function:

Enum EVehicle {
    Car = 'car',
    Bike = 'bike',
    Truck = 'truck'
}

const getVehicleAsEnum = (vehicleStr:string) => vehicleStr === 'car' ? EVehicle.Car : vehicleStr === 'bike' ? EVehicle.Bike : vehicleStr === 'truck' ? EVehicle.Truck : undefined

And then test:

const vehicleEnum = getVecicleAsEnum(str)
if(vehicleEnum) {
   // do something
}

Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3

the only thing that worked for me was to run pod deintegrate and pod install

How to loop through a JSON object with typescript (Angular2)

Assuming your json object from your GET request looks like the one you posted above simply do:

let list: string[] = [];

json.Results.forEach(element => {
    list.push(element.Id);
});

Or am I missing something that prevents you from doing it this way?

I am getting an "Invalid Host header" message when connecting to webpack-dev-server remotely

Add this config to your webpack config file when using webpack-dev-server (you can still specify the host as 0.0.0.0).

devServer: {
    disableHostCheck: true,
    host: '0.0.0.0',
    port: 3000
}

Sort an array of objects in React and render them

You will need to sort your object before mapping over them. And it can be done easily with a sort() function with a custom comparator definition like

var obj = [...this.state.data];
obj.sort((a,b) => a.timeM - b.timeM);
obj.map((item, i) => (<div key={i}> {item.matchID}  
                      {item.timeM} {item.description}</div>))

TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable

I wrote this because I arrive here searching for the same error, and this could be useful for someone in the future.

I get the same error while trying to initialize a service variable from its constructor making a call to a remote API trough http.get and .subscribe()

After many tests without understanding what the problem was, i finally get it: My application had authentication and an HttpInterceptor, and i was trying to initialize the service calling a public API method using http.get(...) without 'No-Auth' headers. I added them like here, and problem solved for me:

getData() {
var reqHeader = new HttpHeaders({ 'Content-Type': 'application/x-www-urlencoded','No-Auth':'True' });    
return this.http.get(environment.urlApi.Literales, { headers: reqHeader });  
}

What a headache :(

Error: the entity type requires a primary key

Your Id property needs to have a setter. However the setter can be private. The [Key] attribute is not necessary if the property is named "Id" as it will find it through the naming convention where it looks for a key with the name "Id".

public Guid Id { get; }              // Will not work
public Guid Id { get; set; }         // Will work
public Guid Id { get; private set; } // Will also work

How to scroll to an element?

In order to automatically scroll into the particular element, first need to select the element using document.getElementById and then we need to scroll using scrollIntoView(). Please refer the below code.

   scrollToElement= async ()=>{
      document.getElementById('id001').scrollIntoView();
    }

The above approach worked for me.

Angular 2 Cannot find control with unspecified name attribute on formArrays

The problem for me was that I had

[formControlName]=""

Instead of

formControlName=""

use Lodash to sort array of object by value

This method orderBy does not change the input array, you have to assign the result to your array :

var chars = this.state.characters;

chars = _.orderBy(chars, ['name'],['asc']); // Use Lodash to sort array by 'name'

 this.setState({characters: chars})

How to push JSON object in to array using javascript

You need to have the 'data' array outside of the loop, otherwise it will get reset in every loop and also you can directly push the json. Find the solution below:-

var my_json;
$.getJSON("https://api.thingspeak.com/channels/"+did+"/feeds.json?api_key="+apikey+"&results=300", function(json1) {
console.log(json1);
var data = [];
json1.feeds.forEach(function(feed,i){
    console.log("\n The details of " + i + "th Object are :  \nCreated_at: " + feed.created_at + "\nEntry_id:" + feed.entry_id + "\nField1:" + feed.field1 + "\nField2:" + feed.field2+"\nField3:" + feed.field3);      
    my_json = feed;
    console.log(my_json); //Object {created_at: "2017-03-14T01:00:32Z", entry_id: 33358, field1: "4", field2: "4", field3: "0"}
    data.push(my_json);
     //["2017-03-14T01:00:32Z", 33358, "4", "4", "0"]
}); 
console.log(data);

Typescript : Property does not exist on type 'object'

You probably have allProviders typed as object[] as well. And property country does not exist on object. If you don't care about typing, you can declare both allProviders and countryProviders as Array<any>:

let countryProviders: Array<any>;
let allProviders: Array<any>;

If you do want static type checking. You can create an interface for the structure and use it:

interface Provider {
    region: string,
    country: string,
    locale: string,
    company: string
}

let countryProviders: Array<Provider>;
let allProviders: Array<Provider>;

Pytorch reshape tensor dimension

This question has been thoroughly answered already, but I want to add for the less experienced python developers that you might find the * operator helpful in conjunction with view().

For example if you have a particular tensor size that you want a different tensor of data to conform to, you might try:

img = Variable(tensor.randn(20,30,3)) # tensor with goal shape
flat_size = 20*30*3
X = Variable(tensor.randn(50, flat_size)) # data tensor

X = X.view(-1, *img.size()) # sweet maneuver
print(X.size()) # size is (50, 20, 30, 3)

This works with numpy shape too:

img = np.random.randn(20,30,3)
flat_size = 20*30*3
X = Variable(tensor.randn(50, flat_size))
X = X.view(-1, *img.shape)
print(X.size()) # size is (50, 20, 30, 3)

What is the role of "Flatten" in Keras?

I came across this recently, it certainly helped me understand: https://www.cs.ryerson.ca/~aharley/vis/conv/

So there's an input, a Conv2D, MaxPooling2D etc, the Flatten layers are at the end and show exactly how they are formed and how they go on to define the final classifications (0-9).

Laravel - htmlspecialchars() expects parameter 1 to be string, object given

Laravel - htmlspecialchars() expects parameter 1 to be string, object given.

thank me latter.........................

when you send or get array from contrller or function but try to print as single value or single variable in laravel blade file so it throws an error

->use any think who convert array into string it work.

solution: 1)run the foreach loop and get single single value and print. 2)The implode() function returns a string from the elements of an array. {{ implode($your_variable,',') }}

implode is best way to do it and its 100% work.

Seaborn Barplot - Displaying Values

Hope this helps for item #2: a) You can sort by total bill then reset the index to this column b) Use palette="Blue" to use this color to scale your chart from light blue to dark blue (if dark blue to light blue then use palette="Blues_d")

import pandas as pd
import seaborn as sns
%matplotlib inline

df=pd.read_csv("https://raw.githubusercontent.com/wesm/pydata-book/master/ch08/tips.csv", sep=',')
groupedvalues=df.groupby('day').sum().reset_index()
groupedvalues=groupedvalues.sort_values('total_bill').reset_index()
g=sns.barplot(x='day',y='tip',data=groupedvalues, palette="Blues")

UndefinedMetricWarning: F-score is ill-defined and being set to 0.0 in labels with no predicted samples

the same problem also happened to me when i training my classification model. the reason caused this problem is as what the warning message said "in labels with no predicated samples", it will caused the zero-division when compute f1-score. I found another solution when i read sklearn.metrics.f1_score doc, there is a note as follows:

When true positive + false positive == 0, precision is undefined; When true positive + false negative == 0, recall is undefined. In such cases, by default the metric will be set to 0, as will f-score, and UndefinedMetricWarning will be raised. This behavior can be modified with zero_division

the zero_division default value is "warn", you could set it to 0 or 1 to avoid UndefinedMetricWarning. it works for me ;) oh wait, there is another problem when i using zero_division, my sklearn report that no such keyword argument by using scikit-learn 0.21.3. Just update your sklearn to the latest version by running pip install scikit-learn -U

How to POST using HTTPclient content type = application/x-www-form-urlencoded

I was using a .Net Core 2.1 API with the [FromBody] attribute and I had to use the following solution to successfully Post to it:

_apiClient =  new HttpClient();
_apiClient.BaseAddress = new Uri(<YOUR API>);
var MyObject myObject = new MyObject(){
    FirstName = "Me",
    LastName = "Myself"
};

var stringified = JsonConvert.SerializeObject(myObject);
var result = await _apiClient.PostAsync("api/appusers", new StringContent(stringified, Encoding.UTF8, "application/json"));

TypeScript enum to object array

class EnumHelpers {

    static getNamesAndValues<T extends number>(e: any) {
        return EnumHelpers.getNames(e).map(n => ({ name: n, value: e[n] as T }));
    }

    static getNames(e: any) {
        return EnumHelpers.getObjValues(e).filter(v => typeof v === 'string') as string[];
    }

    static getValues<T extends number>(e: any) {
        return EnumHelpers.getObjValues(e).filter(v => typeof v === 'number') as T[];
    }

    static getSelectList<T extends number, U>(e: any, stringConverter: (arg: U) => string) {
        const selectList = new Map<T, string>();
        this.getValues(e).forEach(val => selectList.set(val as T, stringConverter(val as unknown as U)));
        return selectList;
    }

    static getSelectListAsArray<T extends number, U>(e: any, stringConverter: (arg: U) => string) {
        return Array.from(this.getSelectList(e, stringConverter), value => ({ value: value[0] as T, presentation: value[1] }));
    }

    private static getObjValues(e: any): (number | string)[] {
        return Object.keys(e).map(k => e[k]);
    }
}

len() of a numpy array in python

What is the len of the equivalent nested list?

len([[2,3,1,0], [2,3,1,0], [3,2,1,1]])

With the more general concept of shape, numpy developers choose to implement __len__ as the first dimension. Python maps len(obj) onto obj.__len__.

X.shape returns a tuple, which does have a len - which is the number of dimensions, X.ndim. X.shape[i] selects the ith dimension (a straight forward application of tuple indexing).

How to remove an item from an array in Vue.js

You can delete item through id

<button @click="deleteEvent(event.id)">Delete</button>

Inside your JS code

deleteEvent(id){
  this.events = this.events.filter((e)=>e.id !== id )
}

Vue wraps an observed array’s mutation methods so they will also trigger view updates. Click here for more details.

You might think this will cause Vue to throw away the existing DOM and re-render the entire list - luckily, that is not the case.

How to resolve Unneccessary Stubbing exception

If you use any() when mocking, you have to relpace @RunWith(MockitoJUnitRunner.class) with @RunWith(MockitoJUnitRunner.Silent.class).

ValueError: cannot reshape array of size 30470400 into shape (50,1104,104)

It seems that there is a typo, since 1104*1104*50=60940800 and you are trying to reshape to dimensions 50,1104,104. So it seems that you need to change 104 to 1104.

Python - AttributeError: 'numpy.ndarray' object has no attribute 'append'

Numpy arrays do not have an append method. Use the Numpy append function instead:

import numpy as np

array_3 = np.append(array_1, array_2, axis=n)
# you can either specify an integer axis value n or remove the keyword argument completely

For example, if array_1 and array_2 have the following values:

array_1 = np.array([1, 2])
array_2 = np.array([3, 4])

If you call np.append without specifying an axis value, like so:

array_3 = np.append(array_1, array_2)

array_3 will have the following value:

array([1, 2, 3, 4])

Else, if you call np.append with an axis value of 0, like so:

array_3 = np.append(array_1, array_2, axis=0)

array_3 will have the following value:

 array([[1, 2],
        [3, 4]])

More information on the append function here: https://docs.scipy.org/doc/numpy/reference/generated/numpy.append.html

Unit Tests not discovered in Visual Studio 2017

I had the same issue. My solution was OK but suddenly when I opened the solution I found out the tests are gone.

Finally I downgraded Microsoft.VisualStudio.TestPlatform.TestFramework and Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions packages to a very old version (using NuGet manager) and test methods showed up. Then I upgraded to latest version and still there were there.

So just downgrade and upgrade packages.

Disable Input fields in reactive form

A more general approach would be.

// Variable/Flag declare
public formDisabled = false;

// Form init
this.form = new FormGroup({
  name: new FormControl({value: '', disabled: this.formDisabled}, 
    Validators.required),
 });

// Enable/disable form control
public toggleFormState() {
    this.formDisabled = !this.formDisabled;
    const state = this.formDisabled ? 'disable' : 'enable';

    Object.keys(this.form.controls).forEach((controlName) => {
        this.form.controls[controlName][state](); // disables/enables each form control based on 'this.formDisabled'
    });
}

Vuejs and Vue.set(), update array

As stated before - VueJS simply can't track those operations(array elements assignment). All operations that are tracked by VueJS with array are here. But I'll copy them once again:

push()
pop()
shift()
unshift()
splice()
sort()
reverse()

During development, you face a problem - how to live with that :).

push(), pop(), shift(), unshift(), sort() and reverse() are pretty plain and help you in some cases but the main focus lies within the splice(), which allows you effectively modify the array that would be tracked by VueJs. So I can share some of the approaches, that are used the most working with arrays.

You need to replace Item in Array:

// note - findIndex might be replaced with some(), filter(), forEach() 
// or any other function/approach if you need 
// additional browser support, or you might use a polyfill
const index = this.values.findIndex(item => {
          return (replacementItem.id === item.id)
        })
this.values.splice(index, 1, replacementItem)

Note: if you just need to modify an item field - you can do it just by:

this.values[index].itemField = newItemFieldValue

And this would be tracked by VueJS as the item(Object) fields would be tracked.

You need to empty the array:

this.values.splice(0, this.values.length)

Actually you can do much more with this function splice() - w3schools link You can add multiple records, delete multiple records, etc.

Vue.set() and Vue.delete()

Vue.set() and Vue.delete() might be used for adding field to your UI version of data. For example, you need some additional calculated data or flags within your objects. You can do this for your objects, or list of objects(in the loop):

 Vue.set(plan, 'editEnabled', true) //(or this.$set)

And send edited data back to the back-end in the same format doing this before the Axios call:

 Vue.delete(plan, 'editEnabled') //(or this.$delete)

How do I check whether an array contains a string in TypeScript?

Also note that "in" keyword does not work on arrays. It works on objects only.

propName in myObject

Array inclusion test is

myArray.includes('three');

Visual Studio 2017 errors on standard headers

I got the errors to go away by installing the Windows Universal CRT SDK component, which adds support for legacy Windows SDKs. You can install this using the Visual Studio Installer:

If the problem still persists, you should change the Target SDK in the Visual Studio Project : check whether the Windows SDK version is 10.0.15063.0.

In : Project -> Properties -> General -> Windows SDK Version -> select 10.0.15063.0.

Then errno.h and other standard files will be found and it will compile.

iloc giving 'IndexError: single positional indexer is out-of-bounds'

This error is caused by:

Y = Dataset.iloc[:,18].values

Indexing is out of bounds here most probably because there are less than 19 columns in your Dataset, so column 18 does not exist. The following code you provided doesn't use Y at all, so you can just comment out this line for now.

How to use forEach in vueJs?

This is an example of forEach usage:

let arr = [];

this.myArray.forEach((value, index) => {
    arr.push(value);
    console.log(value);
    console.log(index);
});

In this case, "myArray" is an array on my data.

You can also loop through an array using filter, but this one should be used if you want to get a new list with filtered elements of your array.

Something like this:

const newArray = this.myArray.filter((value, index) => {
    console.log(value);
    console.log(index);
    if (value > 5) return true;
});

and the same can be written as:

const newArray = this.myArray.filter((value, index) => value > 5);

Both filter and forEach are javascript methods and will work just fine with VueJs. Also, it might be interesting taking a look at this:

https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

Cannot invoke an expression whose type lacks a call signature

Perhaps create a shared Fruit interface that provides isDecayed. fruits is now of type Fruit[] so the type can be explicit. Like this:

interface Fruit {
    isDecayed: boolean;
}

interface Apple extends Fruit {
    color: string;
}

interface Pear extends Fruit {
    weight: number;
}

interface FruitBasket {
    apples: Apple[];
    pears: Pear[];
}


const fruitBasket: FruitBasket = { apples: [], pears: [] };
const key: keyof FruitBasket = Math.random() > 0.5 ? 'apples': 'pears'; 
const fruits: Fruit[] = fruitBasket[key];

const freshFruits = fruits.filter((fruit) => !fruit.isDecayed);

Error:Cause: unable to find valid certification path to requested target

Simple Invalidate/Restart fixed it for me. No other actions were taken

Program to find largest and second largest number in array

If you ever need to find the largest or smallest element in an array, try with bubble sort. Bubble Sort works on simple concept of shifting the biggest element at the end in every pass it does (in case of increasing order). Since you need the first and second largest element in an array, 2 passes of bubble sort will do the trick. The last element will be the largest and the second last element will be second largest. I'm providing you with the link that'll help you understand the bubble sort concept.

http://www.codeido.com/2010/10/bubblesort-written-in-c-with-example-step-by-step/

Hope it helps!!!

python JSON object must be str, bytes or bytearray, not 'dict

`json.dumps()` is used to decode JSON data

import json

# initialize different data
str_data = 'normal string'
int_data = 1
float_data = 1.50
list_data = [str_data, int_data, float_data]
nested_list = [int_data, float_data, list_data]
dictionary = {
    'int': int_data,
    'str': str_data,
    'float': float_data,
    'list': list_data,
    'nested list': nested_list
}

# convert them to JSON data and then print it
print('String :', json.dumps(str_data))
print('Integer :', json.dumps(int_data))
print('Float :', json.dumps(float_data))
print('List :', json.dumps(list_data))
print('Nested List :', json.dumps(nested_list, indent=4))
print('Dictionary :', json.dumps(dictionary, indent=4))  # the json data will be indented

output:

String : "normal string"
Integer : 1
Float : 1.5
List : ["normal string", 1, 1.5]
Nested List : [
    1,
    1.5,
    [
        "normal string",
        1,
        1.5
    ]
]
Dictionary : {
    "int": 1,
    "str": "normal string",
    "float": 1.5,
    "list": [
        "normal string",
        1,
        1.5
    ],
    "nested list": [
        1,
        1.5,
        [
            "normal string",
            1,
            1.5
        ]
    ]
}

Python Object to JSON Data Conversion

|                 Python                 |  JSON  |
|:--------------------------------------:|:------:|
|                  dict                  | object |
|               list, tuple              |  array |
|                   str                  | string |
| int, float, int- & float-derived Enums | number |
|                  True                  |  true  |
|                  False                 |  false |
|                  None                  |  null  |

`json.loads()` is used to convert JSON data into Python data.

import json

# initialize different JSON data
arrayJson = '[1, 1.5, ["normal string", 1, 1.5]]'
objectJson = '{"a":1, "b":1.5 , "c":["normal string", 1, 1.5]}'

# convert them to Python Data
list_data = json.loads(arrayJson)
dictionary = json.loads(objectJson)

print('arrayJson to list_data :\n', list_data)
print('\nAccessing the list data :')
print('list_data[2:] =', list_data[2:])
print('list_data[:1] =', list_data[:1])

print('\nobjectJson to dictionary :\n', dictionary)
print('\nAccessing the dictionary :')
print('dictionary[\'a\'] =', dictionary['a'])
print('dictionary[\'c\'] =', dictionary['c'])

output:

arrayJson to list_data :
 [1, 1.5, ['normal string', 1, 1.5]]

Accessing the list data :
list_data[2:] = [['normal string', 1, 1.5]]
list_data[:1] = [1]

objectJson to dictionary :
 {'a': 1, 'b': 1.5, 'c': ['normal string', 1, 1.5]}

Accessing the dictionary :
dictionary['a'] = 1
dictionary['c'] = ['normal string', 1, 1.5]

JSON Data to Python Object Conversion

|      JSON     | Python |
|:-------------:|:------:|
|     object    |  dict  |
|     array     |  list  |
|     string    |   str  |
|  number (int) |   int  |
| number (real) |  float |
|      true     |  True  |
|     false     |  False |

How to plot vectors in python using matplotlib

Your main problem is you create new figures in your loop, so each vector gets drawn on a different figure. Here's what I came up with, let me know if it's still not what you expect:

CODE:

import numpy as np
import matplotlib.pyplot as plt
M = np.array([[1,1],[-2,2],[4,-7]])

rows,cols = M.T.shape

#Get absolute maxes for axis ranges to center origin
#This is optional
maxes = 1.1*np.amax(abs(M), axis = 0)

for i,l in enumerate(range(0,cols)):
    xs = [0,M[i,0]]
    ys = [0,M[i,1]]
    plt.plot(xs,ys)

plt.plot(0,0,'ok') #<-- plot a black point at the origin
plt.axis('equal')  #<-- set the axes to the same scale
plt.xlim([-maxes[0],maxes[0]]) #<-- set the x axis limits
plt.ylim([-maxes[1],maxes[1]]) #<-- set the y axis limits
plt.legend(['V'+str(i+1) for i in range(cols)]) #<-- give a legend
plt.grid(b=True, which='major') #<-- plot grid lines
plt.show()

OUTPUT:

EDIT CODE:

import numpy as np
import matplotlib.pyplot as plt
M = np.array([[1,1],[-2,2],[4,-7]])

rows,cols = M.T.shape

#Get absolute maxes for axis ranges to center origin
#This is optional
maxes = 1.1*np.amax(abs(M), axis = 0)
colors = ['b','r','k']


for i,l in enumerate(range(0,cols)):
    plt.axes().arrow(0,0,M[i,0],M[i,1],head_width=0.05,head_length=0.1,color = colors[i])

plt.plot(0,0,'ok') #<-- plot a black point at the origin
plt.axis('equal')  #<-- set the axes to the same scale
plt.xlim([-maxes[0],maxes[0]]) #<-- set the x axis limits
plt.ylim([-maxes[1],maxes[1]]) #<-- set the y axis limits
plt.grid(b=True, which='major') #<-- plot grid lines
plt.show()

EDIT OUTPUT:

How to validate array in Laravel?

Asterisk symbol (*) is used to check values in the array, not the array itself.

$validator = Validator::make($request->all(), [
    "names"    => "required|array|min:3",
    "names.*"  => "required|string|distinct|min:3",
]);

In the example above:

"names" must be an array with at least 3 elements,
values in the "names" array must be distinct (unique) strings, at least 3 characters long.

EDIT: Since Laravel 5.5 you can call validate() method directly on Request object like so:

$data = $request->validate([
    "name"    => "required|array|min:3",
    "name.*"  => "required|string|distinct|min:3",
]);

How to plot an array in python?

if you give a 2D array to the plot function of matplotlib it will assume the columns to be lines:

If x and/or y is 2-dimensional, then the corresponding columns will be plotted.

In your case your shape is not accepted (100, 1, 1, 8000). As so you can using numpy squeeze to solve the problem quickly:

np.squeez doc: Remove single-dimensional entries from the shape of an array.

import numpy as np
import matplotlib.pyplot as plt

data = np.random.randint(3, 7, (10, 1, 1, 80))
newdata = np.squeeze(data) # Shape is now: (10, 80)
plt.plot(newdata) # plotting by columns
plt.show()

But notice that 100 sets of 80 000 points is a lot of data for matplotlib. I would recommend that you look for an alternative. The result of the code example (run in Jupyter) is:

Vue.js - How to properly watch for nested data

Another good approach and one that is a bit more elegant is as follows:

 watch:{
     'item.someOtherProp': function (newVal, oldVal){
         //to work with changes in someOtherProp
     },
     'item.prop': function(newVal, oldVal){
         //to work with changes in prop
     }
 }

(I learned this approach from @peerbolte in the comment here)

ReactJs: What should the PropTypes be for this.props.children?

For me it depends on the component. If you know what you need it to be populated with then you should try to specify exclusively, or multiple types using:

PropTypes.oneOfType

If you want to refer to a React component then you will be looking for

PropTypes.element

Although,

PropTypes.node

describes anything that can be rendered - strings, numbers, elements or an array of these things. If this suits you then this is the way.

With very generic components, who can have many types of children, you can also use the below - though bare in mind that eslint and ts may not be happy with this lack of specificity:

PropTypes.any

How to Pass data from child to parent component Angular

Hello you can make use of input and output. Input let you to pass variable form parent to child. Output the same but from child to parent.

The easiest way is to pass "startdate" and "endDate" as input

<calendar [startDateInCalendar]="startDateInSearch" [endDateInCalendar]="endDateInSearch" ></calendar>

In this way you have your startdate and enddate directly in search page. Let me know if it works, or think another way. Thanks

Convert a JSON Object to Buffer and Buffer to JSON Object back

You need to stringify the json, not calling toString

var buf = Buffer.from(JSON.stringify(obj));

And for converting string to json obj :

var temp = JSON.parse(buf.toString());

LogisticRegression: Unknown label type: 'continuous' using sklearn in python

LogisticRegression is not for regression but classification !

The Y variable must be the classification class,

(for example 0 or 1)

And not a continuous variable,

that would be a regression problem.

Remove all items from a FormArray in Angular

Provided the data structure for what you will be replacing the information in the array with matches what is already there you can use patchValue

https://angular.io/docs/ts/latest/api/forms/index/FormArray-class.html#!#reset-anchor

patchValue(value: any[], {onlySelf, emitEvent}?: {onlySelf?: boolean, emitEvent?: boolean}) : void Patches the value of the FormArray. It accepts an array that matches the structure of the control, and will do its best to match the values to the correct controls in the group.

It accepts both super-sets and sub-sets of the array without throwing an error.

const arr = new FormArray([
   new FormControl(),
   new FormControl()
]);
console.log(arr.value);   // [null, null]
arr.patchValue(['Nancy']);
console.log(arr.value);   // ['Nancy', null]

Alternatively you could use reset

reset(value?: any, {onlySelf, emitEvent}?: {onlySelf?: boolean, emitEvent?: boolean}) : void Resets the FormArray. This means by default:

The array and all descendants are marked pristine The array and all descendants are marked untouched The value of all descendants will be null or null maps You can also reset to a specific form state by passing in an array of states that matches the structure of the control. The state can be a standalone value or a form state object with both a value and a disabled status.

this.arr.reset(['name', 'last name']);
console.log(this.arr.value);  // ['name', 'last name']

OR

this.arr.reset([   {value: 'name', disabled: true},   'last' ]);
console.log(this.arr.value);  // ['name', 'last name']
console.log(this.arr.get(0).status);  // 'DISABLED'

Here's a forked Plunker demo from some earlier work of mine demoing a very simple utilization of each.

Initialize a Map containing arrays

Per Mozilla's Map documentation, you can initialize as follows:

private _gridOptions:Map<string, Array<string>> = 
    new Map([
        ["1", ["test"]],
        ["2", ["test2"]]
    ]);

Custom seekbar (thumb size, color and background)

Android custom SeekBar - custom track or progress, shape, size, background and thumb and for other seekbar customization see http://www.zoftino.com/android-seekbar-and-custom-seekbar-examples

Custom Track drawable

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"
        android:gravity="center_vertical|fill_horizontal">
        <shape android:shape="rectangle"
            android:tint="#ffd600">
            <corners android:radius="8dp"/>
            <size android:height="30dp" />
            <solid android:color="#ffd600" />
        </shape>
    </item>
    <item android:id="@android:id/progress"
        android:gravity="center_vertical|fill_horizontal">
        <scale android:scaleWidth="100%">
            <selector>
                <item android:state_enabled="false"
                    android:drawable="@android:color/transparent" />
                <item>
                    <shape android:shape="rectangle"
                        android:tint="#f50057">
                        <corners android:radius="8dp"/>
                        <size android:height="30dp" />
                        <solid android:color="#f50057" />
                    </shape>
                </item>
            </selector>
        </scale>
    </item>
</layer-list>

Custom thumb drawable

?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"
    android:thickness="4dp"
    android:useLevel="false"
    android:tint="#ad1457">
    <solid
        android:color="#ad1457" />
    <size
        android:width="32dp"
        android:height="32dp" />
</shape>

Output

Error when checking model input: expected convolution2d_input_1 to have 4 dimensions, but got array with shape (32, 32, 3)

You should simply apply the following transformation to your input data array.

input_data = input_data.reshape((-1, image_side1, image_side2, channels))

Clearing input in vuejs form

Assuming that you have a form that is huge or simply you do not want to reset each form field one by one, you can reset all the fields of the form by iterating through the fields one by one

var self = this;
Object.keys(this.data.form).forEach(function(key,index) {
    self.data.form[key] = '';
});

The above will reset all fields of the given this.data.form object to empty string. Let's say there are one or two fields that you selectively want to set to a specific value in that case inside the above block you can easily put a condition based on field name

if(key === "country") 
   self.data.form[key] = 'Canada';
else 
   self.data.form[key] = '';

Or if you want to reset the field based on type and you have boolean and other field types in that case

if(typeof self.data.form[key] === "string") 
   self.data.form[key] = ''; 
else if (typeof self.data.form[key] === "boolean") 
   self.data.form[key] = false;

For more type info see here

A basic vuejs template and script sample would look as follow

<template>
  <div>
    <form @submit.prevent="onSubmit">
      <input type="text" class="input" placeholder="User first name" v-model="data.form.firstName">
      <input type="text" class="input" placeholder="User last name" v-model="data.form.lastName">
      <input type="text" class="input" placeholder="User phone" v-model="data.form.phone">
      <input type="submit" class="button is-info" value="Add">
      <input type="button" class="button is-warning" @click="resetForm()" value="Reset Form">
    </form>
  </div>
</template>

See ow the @submit.prevent="onSubmit" is used in the form element. That would by default, prevent the form submission and call the onSubmit function.

Let's assume we have the following for the above

<script>
  export default {
    data() {
      return {
        data: {
          form: {
            firstName: '',
            lastName: '',
            phone: ''
          }
        }
      }
    },
    methods: {
      onSubmit: function() {
        console.log('Make API request.')
        this.resetForm(); //clear form automatically after successful request
      },
      resetForm() {
        console.log('Reseting the form')
        var self = this; //you need this because *this* will refer to Object.keys below`

        //Iterate through each object field, key is name of the object field`
        Object.keys(this.data.form).forEach(function(key,index) {
          self.data.form[key] = '';
        });
      }
    }
  }
</script>

You can call the resetForm from anywhere and it will reset your form fields.

What does 'index 0 is out of bounds for axis 0 with size 0' mean?

In numpy, index and dimension numbering starts with 0. So axis 0 means the 1st dimension. Also in numpy a dimension can have length (size) 0. The simplest case is:

In [435]: x = np.zeros((0,), int)
In [436]: x
Out[436]: array([], dtype=int32)
In [437]: x[0]
...
IndexError: index 0 is out of bounds for axis 0 with size 0

I also get it if x = np.zeros((0,5), int), a 2d array with 0 rows, and 5 columns.

So someplace in your code you are creating an array with a size 0 first axis.

When asking about errors, it is expected that you tell us where the error occurs.

Also when debugging problems like this, the first thing you should do is print the shape (and maybe the dtype) of the suspected variables.

Applied to `pandas`

The same error can occur for those using pandas, when sending a Series or DataFrame to a numpy.array, as with the following:
- pandas.Series.values or pandas.Series.to_numpy() or pandas.Series.array
- pandas.DataFrame.values or pandas.DataFrame.to_numpy()

Resolving the error:

Use a try-except block
Verify the size of the array is not 0
- if x.size != 0:

What is the difference between i = i + 1 and i += 1 in a 'for' loop?

The difference is that one modifies the data-structure itself (in-place operation) b += 1 while the other just reassigns the variable a = a + 1.

Just for completeness:

x += y is not always doing an in-place operation, there are (at least) three exceptions:

If x doesn't implement an __iadd__ method then the x += y statement is just a shorthand for x = x + y. This would be the case if x was something like an int.
If __iadd__ returns NotImplemented, Python falls back to x = x + y.
The __iadd__ method could theoretically be implemented to not work in place. It'd be really weird to do that, though.

As it happens your bs are numpy.ndarrays which implements __iadd__ and return itself so your second loop modifies the original array in-place.

You can read more on this in the Python documentation of "Emulating Numeric Types".

These [__i*__] methods are called to implement the augmented arithmetic assignments (+=, -=, *=, @=, /=, //=, %=, **=, <<=, >>=, &=, ^=, |=). These methods should attempt to do the operation in-place (modifying self) and return the result (which could be, but does not have to be, self). If a specific method is not defined, the augmented assignment falls back to the normal methods. For instance, if x is an instance of a class with an __iadd__() method, x += y is equivalent to x = x.__iadd__(y) . Otherwise, x.__add__(y) and y.__radd__(x) are considered, as with the evaluation of x + y. In certain situations, augmented assignment can result in unexpected errors (see Why does a_tuple[i] += ["item"] raise an exception when the addition works?), but this behavior is in fact part of the data model.

React setState not updating state

setState() is usually asynchronous, which means that at the time you console.log the state, it's not updated yet. Try putting the log in the callback of the setState() method. It is executed after the state change is complete:

this.setState({ dealersOverallTotal: total }, () => {
  console.log(this.state.dealersOverallTotal, 'dealersOverallTotal1');
});

Does bootstrap 4 have a built in horizontal divider?

For Bootstrap 4

<hr> still works for a normal divider. However, if you want a divider with text in the middle:

<div class="row">
    <div class="col"><hr></div>
    <div class="col-auto">OR</div>
    <div class="col"><hr></div>
</div>

How to iterate object keys using *ngFor

i would do this:

<li *ngFor="let item of data" (click)='onclick(item)'>{{item.picture.url}}</li>

How to render an array of objects in React?

You can do it in two ways:

First:

render() {
    const data =[{"name":"test1"},{"name":"test2"}];
    const listItems = data.map((d) => <li key={d.name}>{d.name}</li>);

    return (
      <div>
      {listItems }
      </div>
    );
  }

Second: Directly write the map function in the return

render() {
    const data =[{"name":"test1"},{"name":"test2"}];
    return (
      <div>
      {data.map(function(d, idx){
         return (<li key={idx}>{d.name}</li>)
       })}
      </div>
    );
  }

How to add and remove item from array in components in Vue 2

There are few mistakes you are doing:

You need to add proper object in the array in addRow method
You can use splice method to remove an element from an array at particular index.
You need to pass the current row as prop to my-item component, where this can be modified.

You can see working code here.

addRow(){
   this.rows.push({description: '', unitprice: '' , code: ''}); // what to push unto the rows array?
},
removeRow(index){
   this. itemList.splice(index, 1)
}

Property [title] does not exist on this collection instance

$about = DB::where('page', 'about-me')->first();

in stead of get().

It works on my project. Thanks.

ASP.NET Core Get Json Array using IConfiguration

Short form:

var myArray= configuration.GetSection("MyArray")
                        .AsEnumerable()
                        .Where(p => p.Value != null)
                        .Select(p => p.Value)
                        .ToArray();

It returns an array of string:

{"str1","str2","str3"}

How to declare a Fixed length Array in TypeScript

The javascript array has a constructor that accepts the length of the array:

let arr = new Array<number>(3);
console.log(arr); // [undefined × 3]

However, this is just the initial size, there's no restriction on changing that:

arr.push(5);
console.log(arr); // [undefined × 3, 5]

Typescript has tuple types which let you define an array with a specific length and types:

let arr: [number, number, number];

arr = [1, 2, 3]; // ok
arr = [1, 2]; // Type '[number, number]' is not assignable to type '[number, number, number]'
arr = [1, 2, "3"]; // Type '[number, number, string]' is not assignable to type '[number, number, number]'

Vue - Deep watching an array of objects and calculating the change?

I have changed the implementation of it to get your problem solved, I made an object to track the old changes and compare it with that. You can use it to solve your issue.

Here I created a method, in which the old value will be stored in a separate variable and, which then will be used in a watch.

new Vue({
  methods: {
    setValue: function() {
      this.$data.oldPeople = _.cloneDeep(this.$data.people);
    },
  },
  mounted() {
    this.setValue();
  },
  el: '#app',
  data: {
    people: [
      {id: 0, name: 'Bob', age: 27},
      {id: 1, name: 'Frank', age: 32},
      {id: 2, name: 'Joe', age: 38}
    ],
    oldPeople: []
  },
  watch: {
    people: {
      handler: function (after, before) {
        // Return the object that changed
        var vm = this;
        let changed = after.filter( function( p, idx ) {
          return Object.keys(p).some( function( prop ) {
            return p[prop] !== vm.$data.oldPeople[idx][prop];
          })
        })
        // Log it
        vm.setValue();
        console.log(changed)
      },
      deep: true,
    }
  }
})

See the updated codepen

How to map an array of objects in React

I think you want to print the name of the person or both the name and email :

const renObjData = this.props.data.map(function(data, idx) {
    return <p key={idx}>{data.name}</p>;
});

or :

const renObjData = this.props.data.map(function(data, idx) {
   return ([
       <p key={idx}>{data.name}</p>,
       <p key={idx}>{data.email}</p>,
   ]);
});

How to define Typescript Map of key value pair. where key is a number and value is an array of objects

you can also skip creating dictionary altogether. i used below approach to same problem .

 mappedItems: {};
 items.forEach(item => {     
        if (mappedItems[item.key]) {
           mappedItems[item.key].push({productId : item.productId , price : item.price , discount : item.discount});
        } else {
          mappedItems[item.key] = [];
          mappedItems[item.key].push({productId : item.productId , price : item.price , discount : item.discount}));
        }
    });

Angular ReactiveForms: Producing an array of checkbox values?

With the help of silentsod answer, I wrote a solution to get values instead of states in my formBuilder.

I use a method to add or remove values in the formArray. It may be a bad approch, but it works !

component.html

<div *ngFor="let choice of checks; let i=index" class="col-md-2">
  <label>
    <input type="checkbox" [value]="choice.value" (change)="onCheckChange($event)">
    {{choice.description}}
  </label>
</div>

component.ts

// For example, an array of choices
public checks: Array<ChoiceClass> = [
  {description: 'descr1', value: 'value1'},
  {description: "descr2", value: 'value2'},
  {description: "descr3", value: 'value3'}
];

initModelForm(): FormGroup{
  return this._fb.group({
    otherControls: [''],
    // The formArray, empty 
    myChoices: new FormArray([]),
  }
}

onCheckChange(event) {
  const formArray: FormArray = this.myForm.get('myChoices') as FormArray;

  /* Selected */
  if(event.target.checked){
    // Add a new control in the arrayForm
    formArray.push(new FormControl(event.target.value));
  }
  /* unselected */
  else{
    // find the unselected element
    let i: number = 0;

    formArray.controls.forEach((ctrl: FormControl) => {
      if(ctrl.value == event.target.value) {
        // Remove the unselected element from the arrayForm
        formArray.removeAt(i);
        return;
      }

      i++;
    });
  }
}

When I submit my form, for example my model looks like:

  otherControls : "foo",
  myChoices : ['value1', 'value2']

Only one thing is missing, a function to fill the formArray if your model already has checked values.

How do I add an element to array in reducer of React native redux?

If you need to insert into a specific position in the array, you can do this:

case ADD_ITEM :
    return { 
        ...state,
        arr: [
            ...state.arr.slice(0, action.pos),
            action.newItem,
            ...state.arr.slice(action.pos),
        ],
    }

Removing object from array in Swift 3

The correct and working one-line solution for deleting a unique object (named "objectToRemove") from an array of these objects (named "array") in Swift 3 is:

if let index = array.enumerated().filter( { $0.element === objectToRemove }).map({ $0.offset }).first {
   array.remove(at: index)
}

ReactJS map through Object

Use Object.entries() function.

Object.entries(object) return:

[
    [key, value],
    [key, value],
    ...
]

see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries

{Object.entries(subjects).map(([key, subject], i) => (
    <li className="travelcompany-input" key={i}>
        <span className="input-label">key: {i} Name: {subject.name}</span>
    </li>
))}

How to group an array of objects by key

_x000D_

var cars = [{
  make: 'audi',
  model: 'r8',
  year: '2012'
}, {
  make: 'audi',
  model: 'rs5',
  year: '2013'
}, {
  make: 'ford',
  model: 'mustang',
  year: '2012'
}, {
  make: 'ford',
  model: 'fusion',
  year: '2015'
}, {
  make: 'kia',
  model: 'optima',
  year: '2012'
}].reduce((r, car) => {

  const {
    model,
    year,
    make
  } = car;

  r[make] = [...r[make] || [], {
    model,
    year
  }];

  return r;
}, {});

console.log(cars);

_x000D_

How to get Tensorflow tensor dimensions (shape) as int values?

Another way to solve this is like this:

tensor_shape[0].value

This will return the int value of the Dimension object.

Get properties of a class

This TypeScript code

class A {
    private a1;
    public a2;
}

compiles to this JavaScript code

class A {
}

That's because properties in JavaScript start extisting only after they have some value. You have to assign the properties some value.

class A {
    private a1 = "";
    public a2 = "";
}

it compiles to

class A {
    constructor() {
        this.a1 = "";
        this.a2 = "";
    }
}

Still, you cannot get the properties from mere class (you can get only methods from prototype). You must create an instance. Then you get the properties by calling Object.getOwnPropertyNames().

let a = new A();
let array = return Object.getOwnPropertyNames(a);

array[0] === "a1";
array[1] === "a2";

Applied to your example

class Describer {
    static describe(instance): Array<string> {
        return Object.getOwnPropertyNames(instance);
    }
}

let a = new A();
let x = Describer.describe(a);

Pandas - 'Series' object has no attribute 'colNames' when using apply()

When you use df.apply(), each row of your DataFrame will be passed to your lambda function as a pandas Series. The frame's columns will then be the index of the series and you can access values using series[label].

So this should work:

df['D'] = (df.apply(lambda x: myfunc(x[colNames[0]], x[colNames[1]]), axis=1))

remove item from stored array in angular 2

Sometimes, splice is not enough especially if your array is involved in a FILTER logic. So, first of all you could check if your element does exist to be absolute sure to remove that exact element:

if (array.find(x => x == element)) {
   array.splice(array.findIndex(x => x == element), 1);
}

docker cannot start on windows

For me the issue was virtualization was not enabled.

On windows 10: Go to task manager -> Performance -> CPU and you should see as section as "Virtualization : Enabled"

If you do not see this option, it means that virtualization has not been enabled.

Another interesting thing to note is you must have Hyper V enabled. However as I was using parallels desktop, I had to enabled to "Nested Virtualization" for Hyper V to be "truly enabled". So if your windows is a VM, check out the settings for Parallels (or whatever you're using) that nested virtualization is enabled.

TensorFlow ValueError: Cannot feed value of shape (64, 64, 3) for Tensor u'Placeholder:0', which has shape '(?, 64, 64, 3)'

image has a shape of (64,64,3).

Your input placeholder _x have a shape of (?, 64,64,3).

The problem is that you're feeding the placeholder with a value of a different shape.

You have to feed it with a value of (1, 64, 64, 3) = a batch of 1 image.

Just reshape your image value to a batch with size one.

image = array(img).reshape(1, 64,64,3)

P.S: the fact that the input placeholder accepts a batch of images, means that you can run predicions for a batch of images in parallel. You can try to read more than 1 image (N images) and than build a batch of N image, using a tensor with shape (N, 64,64,3)

ES6 map an array of objects, to return an array of objects with new keys

You just need to wrap object in ()

_x000D_

var arr = [{_x000D_
  id: 1,_x000D_
  name: 'bill'_x000D_
}, {_x000D_
  id: 2,_x000D_
  name: 'ted'_x000D_
}]_x000D_
_x000D_
var result = arr.map(person => ({ value: person.id, text: person.name }));_x000D_
console.log(result)

_x000D_

Selected tab's color in Bottom Navigation View

Try using android:state_enabled rather than android:state_selected for the selector item attributes.

Find object by its property in array of objects with AngularJS way

How about plain JavaScript? More about Array.prototype.filter().

_x000D_

var myArray = [{'id': '73', 'name': 'john'}, {'id': '45', 'name': 'Jass'}]_x000D_
_x000D_
var item73 = myArray.filter(function(item) {_x000D_
  return item.id === '73';_x000D_
})[0];_x000D_
_x000D_
// even nicer with ES6 arrow functions:_x000D_
// var item73 = myArray.filter(i => i.id === '73')[0];_x000D_
_x000D_
console.log(item73); // {"id": "73", "name": "john"}

_x000D_

How to get parameter on Angular2 route in Angular way?

As of Angular 6+, this is handled slightly differently than in previous versions. As @BeetleJuice mentions in the answer above, paramMap is new interface for getting route params, but the execution is a bit different in more recent versions of Angular. Assuming this is in a component:

private _entityId: number;

constructor(private _route: ActivatedRoute) {
    // ...
}

ngOnInit() {
    // For a static snapshot of the route...
    this._entityId = this._route.snapshot.paramMap.get('id');

    // For subscribing to the observable paramMap...
    this._route.paramMap.pipe(
        switchMap((params: ParamMap) => this._entityId = params.get('id'))
    );

    // Or as an alternative, with slightly different execution...
    this._route.paramMap.subscribe((params: ParamMap) =>  {
        this._entityId = params.get('id');
    });
}

I prefer to use both because then on direct page load I can get the ID param, and also if navigating between related entities the subscription will update properly.

Source in Angular Docs

Reload child component when variables on parent component changes. Angular2

You can use @input with ngOnChanges, to see the changes when it happened.

reference: https://angular.io/api/core/OnChanges

(or)

If you want to pass data between multiple component or routes then go with Rxjs way.

Service.ts

import { Injectable } from '@angular/core';
import { Observable, Subject } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class MessageService {
  private subject = new Subject<any>();

  sendMessage(message: string) {
    this.subject.next({ text: message });
  }

  clearMessages() {
    this.subject.next();
  }

  getMessage(): Observable<any> {
    return this.subject.asObservable();
  }
}

Component.ts

import { Component, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';

import { MessageService } from './_services/index';

@Component({
  selector: 'app',
  templateUrl: 'app.component.html'
})

export class AppComponent implements OnDestroy {
  messages: any[] = [];
  subscription: Subscription;

  constructor(private messageService: MessageService) {
    // subscribe to home component messages
    this.subscription = this.messageService.getMessage().subscribe(message => {
      if (message) {
        this.messages.push(message);
      } else {
        // clear messages when empty message received
        this.messages = [];
      }
    });
  }

  ngOnDestroy() {
    // unsubscribe to ensure no memory leaks
    this.subscription.unsubscribe();
  }
}

Reference: http://jasonwatmore.com/post/2019/02/07/angular-7-communicating-between-components-with-observable-subject

Getting an object array from an Angular service

Take a look at your code :

 getUsers(): Observable<User[]> {
        return Observable.create(observer => {
            this.http.get('http://users.org').map(response => response.json();
        })
    }

and code from https://angular.io/docs/ts/latest/tutorial/toh-pt6.html (BTW. really good tutorial, you should check it out)

 getHeroes(): Promise<Hero[]> {
    return this.http.get(this.heroesUrl)
               .toPromise()
               .then(response => response.json().data as Hero[])
               .catch(this.handleError);
  }

The HttpService inside Angular2 already returns an observable, sou don't need to wrap another Observable around like you did here:

   return Observable.create(observer => {
        this.http.get('http://users.org').map(response => response.json()

Try to follow the guide in link that I provided. You should be just fine when you study it carefully.

---EDIT----

First of all WHERE you log the this.users variable? JavaScript isn't working that way. Your variable is undefined and it's fine, becuase of the code execution order!

Try to do it like this:

  getUsers(): void {
        this.userService.getUsers()
            .then(users => {
               this.users = users
               console.log('this.users=' + this.users);
            });


    }

See where the console.log(...) is!

Try to resign from toPromise() it's seems to be just for ppl with no RxJs background.

Catch another link: https://scotch.io/tutorials/angular-2-http-requests-with-observables Build your service once again with RxJs observables.

push object into array

You have to create an object. Assign the values to the object. Then push it into the array:

var nietos = [];
var obj = {};
obj["01"] = nieto.label;
obj["02"] = nieto.value;
nietos.push(obj);

how to implement Pagination in reactJs

I recently created this Pagination component that implements paging logic like Google's search results:

import React, { PropTypes } from 'react';
 
const propTypes = {
    items: PropTypes.array.isRequired,
    onChangePage: PropTypes.func.isRequired,
    initialPage: PropTypes.number   
}
 
const defaultProps = {
    initialPage: 1
}
 
class Pagination extends React.Component {
    constructor(props) {
        super(props);
        this.state = { pager: {} };
    }
 
    componentWillMount() {
        this.setPage(this.props.initialPage);
    }
 
    setPage(page) {
        var items = this.props.items;
        var pager = this.state.pager;
 
        if (page < 1 || page > pager.totalPages) {
            return;
        }
 
        // get new pager object for specified page
        pager = this.getPager(items.length, page);
 
        // get new page of items from items array
        var pageOfItems = items.slice(pager.startIndex, pager.endIndex + 1);
 
        // update state
        this.setState({ pager: pager });
 
        // call change page function in parent component
        this.props.onChangePage(pageOfItems);
    }
 
    getPager(totalItems, currentPage, pageSize) {
        // default to first page
        currentPage = currentPage || 1;
 
        // default page size is 10
        pageSize = pageSize || 10;
 
        // calculate total pages
        var totalPages = Math.ceil(totalItems / pageSize);
 
        var startPage, endPage;
        if (totalPages <= 10) {
            // less than 10 total pages so show all
            startPage = 1;
            endPage = totalPages;
        } else {
            // more than 10 total pages so calculate start and end pages
            if (currentPage <= 6) {
                startPage = 1;
                endPage = 10;
            } else if (currentPage + 4 >= totalPages) {
                startPage = totalPages - 9;
                endPage = totalPages;
            } else {
                startPage = currentPage - 5;
                endPage = currentPage + 4;
            }
        }
 
        // calculate start and end item indexes
        var startIndex = (currentPage - 1) * pageSize;
        var endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
 
        // create an array of pages to ng-repeat in the pager control
        var pages = _.range(startPage, endPage + 1);
 
        // return object with all pager properties required by the view
        return {
            totalItems: totalItems,
            currentPage: currentPage,
            pageSize: pageSize,
            totalPages: totalPages,
            startPage: startPage,
            endPage: endPage,
            startIndex: startIndex,
            endIndex: endIndex,
            pages: pages
        };
    }
 
    render() {
        var pager = this.state.pager;
 
        return (
            <ul className="pagination">
                <li className={pager.currentPage === 1 ? 'disabled' : ''}>
                    <a onClick={() => this.setPage(1)}>First</a>
                </li>
                <li className={pager.currentPage === 1 ? 'disabled' : ''}>
                    <a onClick={() => this.setPage(pager.currentPage - 1)}>Previous</a>
                </li>
                {pager.pages.map((page, index) =>
                    <li key={index} className={pager.currentPage === page ? 'active' : ''}>
                        <a onClick={() => this.setPage(page)}>{page}</a>
                    </li>
                )}
                <li className={pager.currentPage === pager.totalPages ? 'disabled' : ''}>
                    <a onClick={() => this.setPage(pager.currentPage + 1)}>Next</a>
                </li>
                <li className={pager.currentPage === pager.totalPages ? 'disabled' : ''}>
                    <a onClick={() => this.setPage(pager.totalPages)}>Last</a>
                </li>
            </ul>
        );
    }
}
 
Pagination.propTypes = propTypes;
Pagination.defaultProps
export default Pagination;

And here's an example App component that uses the Pagination component to paginate a list of 150 example items:

import React from 'react';
import Pagination from './Pagination';
 
class App extends React.Component {
    constructor() {
        super();
 
        // an example array of items to be paged
        var exampleItems = _.range(1, 151).map(i => { return { id: i, name: 'Item ' + i }; });
 
        this.state = {
            exampleItems: exampleItems,
            pageOfItems: []
        };
 
        // bind function in constructor instead of render (https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md)
        this.onChangePage = this.onChangePage.bind(this);
    }
 
    onChangePage(pageOfItems) {
        // update state with new page of items
        this.setState({ pageOfItems: pageOfItems });
    }
 
    render() {
        return (
            <div>
                <div className="container">
                    <div className="text-center">
                        <h1>React - Pagination Example with logic like Google</h1>
                        {this.state.pageOfItems.map(item =>
                            <div key={item.id}>{item.name}</div>
                        )}
                        <Pagination items={this.state.exampleItems} onChangePage={this.onChangePage} />
                    </div>
                </div>
                <hr />
                <div className="credits text-center">
                    <p>
                        <a href="http://jasonwatmore.com" target="_top">JasonWatmore.com</a>
                    </p>
                </div>
            </div>
        );
    }
}
 
export default App;

For more details and a live demo you can check out this post

Use async await with Array.map

You can use:

for await (let resolvedPromise of arrayOfPromises) {
  console.log(resolvedPromise)
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of

If you wish to use Promise.all() instead you can go for Promise.allSettled() So you can have better control over rejected promises.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/allSettled

Python - Convert a bytes array into JSON format

Your bytes object is almost JSON, but it's using single quotes instead of double quotes, and it needs to be a string. So one way to fix it is to decode the bytes to str and replace the quotes. Another option is to use ast.literal_eval; see below for details. If you want to print the result or save it to a file as valid JSON you can load the JSON to a Python list and then dump it out. Eg,

import json

my_bytes_value = b'[{\'Date\': \'2016-05-21T21:35:40Z\', \'CreationDate\': \'2012-05-05\', \'LogoType\': \'png\', \'Ref\': 164611595, \'Classe\': [\'Email addresses\', \'Passwords\'],\'Link\':\'http://some_link.com\'}]'

# Decode UTF-8 bytes to Unicode, and convert single quotes 
# to double quotes to make it valid JSON
my_json = my_bytes_value.decode('utf8').replace("'", '"')
print(my_json)
print('- ' * 20)

# Load the JSON to a Python list & dump it back out as formatted JSON
data = json.loads(my_json)
s = json.dumps(data, indent=4, sort_keys=True)
print(s)

output

[{"Date": "2016-05-21T21:35:40Z", "CreationDate": "2012-05-05", "LogoType": "png", "Ref": 164611595, "Classe": ["Email addresses", "Passwords"],"Link":"http://some_link.com"}]
- - - - - - - - - - - - - - - - - - - - 
[
    {
        "Classe": [
            "Email addresses",
            "Passwords"
        ],
        "CreationDate": "2012-05-05",
        "Date": "2016-05-21T21:35:40Z",
        "Link": "http://some_link.com",
        "LogoType": "png",
        "Ref": 164611595
    }
]

As Antti Haapala mentions in the comments, we can use ast.literal_eval to convert my_bytes_value to a Python list, once we've decoded it to a string.

from ast import literal_eval
import json

my_bytes_value = b'[{\'Date\': \'2016-05-21T21:35:40Z\', \'CreationDate\': \'2012-05-05\', \'LogoType\': \'png\', \'Ref\': 164611595, \'Classe\': [\'Email addresses\', \'Passwords\'],\'Link\':\'http://some_link.com\'}]'

data = literal_eval(my_bytes_value.decode('utf8'))
print(data)
print('- ' * 20)

s = json.dumps(data, indent=4, sort_keys=True)
print(s)

Generally, this problem arises because someone has saved data by printing its Python repr instead of using the json module to create proper JSON data. If it's possible, it's better to fix that problem so that proper JSON data is created in the first place.

Are dictionaries ordered in Python 3.6+?

I wanted to add to the discussion above but don't have the reputation to comment.

Python 3.8 is not quite released yet, but it will even include the reversed() function on dictionaries (removing another difference from OrderedDict.

Dict and dictviews are now iterable in reversed insertion order using reversed(). (Contributed by Rémi Lapeyre in bpo-33462.) See what's new in python 3.8

I don't see any mention of the equality operator or other features of OrderedDict so they are still not entirely the same.

How to loop an object in React?

You can use map function

{Object.keys(tifs).map(key => (
    <option value={key}>{tifs[key]}</option>
))}

Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $

Also this issue occurres when the response contenttype is not application/json. In my case response contenttype was text/html and i faced this problem. I changed it to application/json then it worked.

How to get first and last element in an array in java?

// Array of doubles
double[] array_doubles = {2.5, 6.2, 8.2, 4846.354, 9.6};

// First position
double firstNum = array_doubles[0]; // 2.5

// Last position
double lastNum = array_doubles[array_doubles.length - 1]; // 9.6

This is the same in any array.

Add key value pair to all objects in array

Simply use map function:

var arrOfObj = arrOfObj.map(function(element){
   element.active = true;
   return element;
}

Map is pretty decent on compatibility: you can be reasonably safe from IE <= 9.

However, if you are 100% sure your users will use ES6 Compatible browser, you can shorten that function with arrow functions, as @Sergey Panfilov has suggested.

Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays

You can declare the books (on line 2) as an array:

title: any = 'List of books are represted in the bookstore';
books: any = []; 
constructor(private service:  AppService){
}

ngOnInit(){
  this.getBookDetails();
}

getBookDetails() {
    this.service.getBooks().subscribe(books => {
        this.books = books.json();
        console.log(this.books);
    });
}

How to convert array into comma separated string in javascript

You can simply use JavaScripts join() function for that. This would simply look like a.value.join(','). The output would be a string though.

Angular2: Cannot read property 'name' of undefined

You were getting this error because you followed the poorly-written directions on the Heroes tutorial. I ran into the same thing.

Specifically, under the heading Display hero names in a template, it states:

To display the hero names in an unordered list, insert the following chunk of HTML below the title and above the hero details.

followed by this code block:

<h2>My Heroes</h2>
<ul class="heroes">
  <li>
    <!-- each hero goes here -->
  </li>
</ul>

It does not instruct you to replace the previous detail code, and it should. This is why we are left with:

<h2>{{hero.name}} details!</h2>

outside of our *ngFor.

However, if you scroll further down the page, you will encounter the following:

The template for displaying heroes should look like this:

<h2>My Heroes</h2>
<ul class="heroes">
  <li *ngFor="let hero of heroes">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

Note the absence of the detail elements from previous efforts.

An error like this by the author can result in quite a wild goose-chase. Hopefully, this post helps others avoid that.

Postgres: check if array field contains value?

Instead of IN we can use ANY with arrays casted to enum array, for example:

create type example_enum as enum (
  'ENUM1', 'ENUM2'
);

create table example_table (
  id integer,
  enum_field example_enum
);

select 
  * 
from 
  example_table t
where
  t.enum_field = any(array['ENUM1', 'ENUM2']::example_enum[]);

Or we can still use 'IN' clause, but first, we should 'unnest' it:

select 
  * 
from 
  example_table t
where
  t.enum_field in (select unnest(array['ENUM1', 'ENUM2']::example_enum[]));

Example: https://www.db-fiddle.com/f/LaUNi42HVuL2WufxQyEiC/0

add Shadow on UIView using swift 3

Very simple and few lines of code:

let viewShadow = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
viewShadow.center = self.view.center
viewShadow.backgroundColor = UIColor.yellow
viewShadow.layer.shadowColor = UIColor.red.cgColor
viewShadow.layer.shadowOpacity = 1
viewShadow.layer.shadowOffset = CGSize.zero
viewShadow.layer.shadowRadius = 5
self.view.addSubview(viewShadow)

Look like :

Showing ValueError: shapes (1,3) and (1,3) not aligned: 3 (dim 1) != 1 (dim 0)

By converting the matrix to array by using

n12 = np.squeeze(np.asarray(n2))

X12 = np.squeeze(np.asarray(x1))

solved the issue.

Use component from another module

You have to export it from your NgModule:

@NgModule({
  declarations: [TaskCardComponent],
  exports: [TaskCardComponent],
  imports: [MdCardModule],
  providers: []
})
export class TaskModule{}

Angular 2 select option (dropdown) - how to get the value on change so it can be used in a function?

Template/HTML File (component.ts)

<select>
 <option *ngFor="let v of values" [value]="v" (ngModelChange)="onChange($event)">  
    {{v.name}}
  </option>
</select>

Typescript File (component.ts)

values = [
  { id: 3432, name: "Recent" },
  { id: 3442, name: "Most Popular" },
  { id: 3352, name: "Rating" }
];

onChange(cityEvent){
    console.log(cityEvent); // It will display the select city data
}

(ngModelChange) is the @Output of the ngModel directive. It fires when the model changes. You cannot use this event without the ngModel directive

How do I mock a REST template exchange?

If you are using RestTemplateBuilder may be the usual thing wouldn't work. You need to add this in your test class along with when(condition).

@Before    
public void setup() {        
     ReflectionTestUtils.setField(service, "restTemplate", restTemplate);    
}

Angular 2 declaring an array of objects

First, generate an Interface

Assuming you are using TypeScript & Angular CLI, you can generate one by using the following command

ng g interface car

After that set the data types of its properties

// car.interface.ts
export interface car {
  id: number;
  eco: boolean;
  wheels: number;
  name: string;
}

You can now import your interface in the class that you want.

import {car} from "app/interfaces/car.interface";

And update the collection/array of car objects by pushing items in the array.

this.car.push({
  id: 12345,
  eco: true,
  wheels: 4,
  name: 'Tesla Model S',
});

DataTables: Cannot read property style of undefined

You said any suggestions wold be helpful, so currently I resolved my DataTables "cannot read property 'style' of undefined" problem but my problem was basically using wrong indexes at data table initiation phase's columnDefs section. I got 9 columns and the indexes are 0, 1, 2, .. , 8 but I was using indexes for 9 and 10 so after fixing the wrong index issue the fault has disappeared. I hope this helps.

In short, you got to watch your columns amount and indexes if consistent everywhere.

Buggy Code:

    jQuery('#table').DataTable({
        "ajax": {
            url: "something_url",
            type: 'POST'
        },
        "processing": true,
        "serverSide": true,
        "bPaginate": true,
        "sPaginationType": "full_numbers",
        "columns": [
            { "data": "cl1" },
            { "data": "cl2" },
            { "data": "cl3" },
            { "data": "cl4" },
            { "data": "cl5" },
            { "data": "cl6" },
            { "data": "cl7" },
            { "data": "cl8" },
            { "data": "cl9" }
        ],
        columnDefs: [
            { orderable: false, targets: [ 7, 9, 10 ] } //This part was wrong
        ]
    });

Fixed Code:

    jQuery('#table').DataTable({
        "ajax": {
            url: "something_url",
            type: 'POST'
        },
        "processing": true,
        "serverSide": true,
        "bPaginate": true,
        "sPaginationType": "full_numbers",
        "columns": [
            { "data": "cl1" },
            { "data": "cl2" },
            { "data": "cl3" },
            { "data": "cl4" },
            { "data": "cl5" },
            { "data": "cl6" },
            { "data": "cl7" },
            { "data": "cl8" },
            { "data": "cl9" }
        ],
        columnDefs: [
            { orderable: false, targets: [ 5, 7, 8 ] } //This part is ok now
        ]
    });

How to convert JSON object to an Typescript array?

You have a JSON object that contains an Array. You need to access the array results. Change your code to:

this.data = res.json().results

How do I increase the contrast of an image in Python OpenCV

I would like to suggest a method using the LAB color channel. Wikipedia has enough information regarding what the LAB color channel is about.

I have done the following using OpenCV 3.0.0 and python:

import cv2

#-----Reading the image-----------------------------------------------------
img = cv2.imread('Dog.jpg', 1)
cv2.imshow("img",img) 

#-----Converting image to LAB Color model----------------------------------- 
lab= cv2.cvtColor(img, cv2.COLOR_BGR2LAB)
cv2.imshow("lab",lab)

#-----Splitting the LAB image to different channels-------------------------
l, a, b = cv2.split(lab)
cv2.imshow('l_channel', l)
cv2.imshow('a_channel', a)
cv2.imshow('b_channel', b)

#-----Applying CLAHE to L-channel-------------------------------------------
clahe = cv2.createCLAHE(clipLimit=3.0, tileGridSize=(8,8))
cl = clahe.apply(l)
cv2.imshow('CLAHE output', cl)

#-----Merge the CLAHE enhanced L-channel with the a and b channel-----------
limg = cv2.merge((cl,a,b))
cv2.imshow('limg', limg)

#-----Converting image from LAB Color model to RGB model--------------------
final = cv2.cvtColor(limg, cv2.COLOR_LAB2BGR)
cv2.imshow('final', final)

#_____END_____#

You can run the code as it is. To know what CLAHE (Contrast Limited Adaptive Histogram Equalization)is about, you can again check Wikipedia.

Error: Unexpected value 'undefined' imported by the module

Just putting the provider inside the forRoot works: https://github.com/ocombe/ng2-translate

@NgModule({
  imports: [BrowserModule, HttpModule, RouterModule.forRoot(routes), /* AboutModule, HomeModule, SharedModule.forRoot()*/
          FormsModule,
          ReactiveFormsModule,
          //third-party
          TranslateModule.forRoot({
            provide: TranslateLoader,
            useFactory: (http: Http) => new TranslateStaticLoader(http, '/assets/i18n', '.json'),
            deps: [Http]
          })
          //third-party PRIMENG
          ,CalendarModule,DataTableModule,DialogModule,PanelModule
  ],
  declarations: [
    AppComponent,ThemeComponent, ToolbarComponent, RemoveHostTagDirective,
    HomeComponent,MessagesExampleComponent,PrimeNgHomeComponent,CalendarComponent,Ng2BootstrapExamplesComponent,DatepickerDemoComponent,UserListComponent,UserEditComponent,ContractListComponent,AboutComponent
  ],
  providers: [
    {
      provide: APP_BASE_HREF,
      useValue: '<%= APP_BASE %>'
    },
    // FormsModule,
    ReactiveFormsModule,
    { provide : MissingTranslationHandler, useClass: TranslationNotFoundHandler},
    AuthGuard,AppConfigService,AppConfig,
    DateHelper
  ],
  bootstrap: [AppComponent]
})

export class AppModule { }

Split Spark Dataframe string column into multiple columns

pyspark.sql.functions.split() is the right approach here - you simply need to flatten the nested ArrayType column into multiple top-level columns. In this case, where each array only contains 2 items, it's very easy. You simply use Column.getItem() to retrieve each part of the array as a column itself:

split_col = pyspark.sql.functions.split(df['my_str_col'], '-')
df = df.withColumn('NAME1', split_col.getItem(0))
df = df.withColumn('NAME2', split_col.getItem(1))

The result will be:

col1 | my_str_col | NAME1 | NAME2
-----+------------+-------+------
  18 |  856-yygrm |   856 | yygrm
 201 |  777-psgdg |   777 | psgdg

I am not sure how I would solve this in a general case where the nested arrays were not the same size from Row to Row.

Angular get object from array by Id

CASE - 1

Using array.filter() We can get an array of objects which will match with our condition.
see the working example.

_x000D_

var questions = [
      {id: 1, question: "Do you feel a connection to a higher source and have a sense of comfort knowing that you are part of something greater than yourself?", category: "Spiritual", subs: []},
      {id: 2, question: "Do you feel you are free of unhealthy behavior that impacts your overall well-being?", category: "Habits", subs: []},
      {id: 3, question: "1 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 3, question: "2 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 3, question: "3 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 4, question: "Do you feel you have a sense of purpose and that you have a positive outlook about yourself and life?", category: "Emotional Well-being", subs: []},
      {id: 5, question: "Do you feel you have a healthy diet and that you are fueling your body for optimal health? ", category: "Eating Habits ", subs: []},
      {id: 6, question: "Do you feel that you get enough rest and that your stress level is healthy?", category: "Relaxation ", subs: []},
      {id: 7, question: "Do you feel you get enough physical activity for optimal health?", category: "Exercise ", subs: []},
      {id: 8, question: "Do you feel you practice self-care and go to the doctor regularly?", category: "Medical Maintenance", subs: []},
      {id: 9, question: "Do you feel satisfied with your income and economic stability?", category: "Financial", subs: []},
      {id: 10, question: "1 Do you feel you do fun things and laugh enough in your life?", category: "Play", subs: []},
      {id: 10, question: "2 Do you feel you do fun things and laugh enough in your life?", category: "Play", subs: []},
      {id: 11, question: "Do you feel you have a healthy sense of balance in this area of your life?", category: "Work-life Balance", subs: []},
      {id: 12, question: "Do you feel a sense of peace and contentment  in your home? ", category: "Home Environment", subs: []},
      {id: 13, question: "Do you feel that you are challenged and growing as a person?", category: "Intellectual Wellbeing", subs: []},
      {id: 14, question: "Do you feel content with what you see when you look in the mirror?", category: "Self-image", subs: []},
      {id: 15, question: "Do you feel engaged at work and a sense of fulfillment with your job?", category: "Work Satisfaction", subs: []}
];

function filter(){
  console.clear();
  var filter_id = document.getElementById("filter").value;
  var filter_array = questions.filter(x => x.id == filter_id);
  console.log(filter_array);
}

_x000D_

button {
  background: #0095ff;
  color: white;
  border: none;
  border-radius: 3px;
  padding: 8px;
  cursor: pointer;
}

input {
  padding: 8px;
}

_x000D_

<div>
  <label for="filter"></label>
  <input id="filter" type="number" name="filter" placeholder="Enter id which you want to filter">
  <button onclick="filter()">Filter</button>
</div>

_x000D_

CASE - 2

Using array.find() we can get first matched item and break the iteration.

_x000D_

var questions = [
      {id: 1, question: "Do you feel a connection to a higher source and have a sense of comfort knowing that you are part of something greater than yourself?", category: "Spiritual", subs: []},
      {id: 2, question: "Do you feel you are free of unhealthy behavior that impacts your overall well-being?", category: "Habits", subs: []},
      {id: 3, question: "1 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 3, question: "2 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 3, question: "3 Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 4, question: "Do you feel you have a sense of purpose and that you have a positive outlook about yourself and life?", category: "Emotional Well-being", subs: []},
      {id: 5, question: "Do you feel you have a healthy diet and that you are fueling your body for optimal health? ", category: "Eating Habits ", subs: []},
      {id: 6, question: "Do you feel that you get enough rest and that your stress level is healthy?", category: "Relaxation ", subs: []},
      {id: 7, question: "Do you feel you get enough physical activity for optimal health?", category: "Exercise ", subs: []},
      {id: 8, question: "Do you feel you practice self-care and go to the doctor regularly?", category: "Medical Maintenance", subs: []},
      {id: 9, question: "Do you feel satisfied with your income and economic stability?", category: "Financial", subs: []},
      {id: 10, question: "1 Do you feel you do fun things and laugh enough in your life?", category: "Play", subs: []},
      {id: 10, question: "2 Do you feel you do fun things and laugh enough in your life?", category: "Play", subs: []},
      {id: 11, question: "Do you feel you have a healthy sense of balance in this area of your life?", category: "Work-life Balance", subs: []},
      {id: 12, question: "Do you feel a sense of peace and contentment  in your home? ", category: "Home Environment", subs: []},
      {id: 13, question: "Do you feel that you are challenged and growing as a person?", category: "Intellectual Wellbeing", subs: []},
      {id: 14, question: "Do you feel content with what you see when you look in the mirror?", category: "Self-image", subs: []},
      {id: 15, question: "Do you feel engaged at work and a sense of fulfillment with your job?", category: "Work Satisfaction", subs: []}
];

function find(){
  console.clear();
  var find_id = document.getElementById("find").value;
  var find_object = questions.find(x => x.id == find_id);
  console.log(find_object);
}

_x000D_

button {
  background: #0095ff;
  color: white;
  border: none;
  border-radius: 3px;
  padding: 8px;
  cursor: pointer;
}

input {
  padding: 8px;
  width: 200px;
}

_x000D_

<div>
  <label for="find"></label>
  <input id="find" type="number" name="find" placeholder="Enter id which you want to find">
  <button onclick="find()">Find</button>
</div>

_x000D_

Send POST data via raw json with postman

I was facing the same problem, following code worked for me:

$params = (array) json_decode(file_get_contents('php://input'), TRUE);
print_r($params);

npm install error - unable to get local issuer certificate

I have encountered the same issue. This command didn't work for me either:

npm config set strict-ssl false

After digging deeper, I found out that this link was block by our IT admin.

http://registry.npmjs.org/npm

So if you are facing the same issue, make sure this link is accessible to your browser first.

git pull fails "unable to resolve reference" "unable to update local ref"

To Answer this in very short, this issue comes when your local has some information about the remote and someone changes something which makes remote and your changes unsync.

I was getting this issue because someone has deleted remote branch and again created with the same name.

For dealing with such issues, do a pull or fetch from remote.

git remote prune origin

or if you are using any GUI, do a fetch from remote.

How to export collection to CSV in MongoDB?

For all those who are stuck with an error.

Let me give you guys a solution with a brief explanation of the same:-

command to connect:-

mongoexport --host your_host --port your_port -u your_username -p your_password --db your_db --collection your_collection --type=csv --out file_name.csv --fields all_the_fields --authenticationDatabase admin

--host --> host of Mongo server

--port --> port of Mongo server

-u --> username

-p --> password

--db --> db from which you want to export

--collection --> collection you want to export

--type --> type of export in my case CSV

--out --> file name where you want to export

--fields --> all the fields you want to export (don't give spaces in between two field name in between commas in case of CSV)

--authenticationDatabase --> database where all your user information is stored

How to pass a null variable to a SQL Stored Procedure from C#.net code

SqlParameters[1] = new SqlParameter("Date1", SqlDbType.SqlDateTime);
SqlParameters[1].Value = DBNull.Value;
SqlParameters[1].Direction = ParameterDirection.Input;

...then copy for the second.

Oracle TNS names not showing when adding new connection to SQL Developer

SQL Developer will look in the following location in this order for a tnsnames.ora file

$HOME/.tnsnames.ora
$TNS_ADMIN/tnsnames.ora
TNS_ADMIN lookup key in the registry
/etc/tnsnames.ora ( non-windows )
$ORACLE_HOME/network/admin/tnsnames.ora
LocalMachine\SOFTWARE\ORACLE\ORACLE_HOME_KEY
LocalMachine\SOFTWARE\ORACLE\ORACLE_HOME

To see which one SQL Developer is using, issue the command show tns in the worksheet

If your tnsnames.ora file is not getting recognized, use the following procedure:

Define an environmental variable called TNS_ADMIN to point to the folder that contains your tnsnames.ora file.

In Windows, this is done by navigating to Control Panel > System > Advanced system settings > Environment Variables...

In Linux, define the TNS_ADMIN variable in the .profile file in your home directory.
Confirm the os is recognizing this environmental variable

From the Windows command line: echo %TNS_ADMIN%

From linux: echo $TNS_ADMIN
Restart SQL Developer
Now in SQL Developer right click on Connections and select New Connection.... Select TNS as connection type in the drop down box. Your entries from tnsnames.ora should now display here.

Font.createFont(..) set color and size (java.awt.Font)

Well, once you have your font, you can invoke deriveFont. For example,

helvetica = helvetica.deriveFont(Font.BOLD, 12f);

Changes the font's style to bold and its size to 12 points.

Make a directory and copy a file

Use the FileSystemObject object, namely, its CreateFolder and CopyFile methods. Basically, this is what your script will look like:

Dim oFSO
Set oFSO = CreateObject("Scripting.FileSystemObject")

' Create a new folder
oFSO.CreateFolder "C:\MyFolder"

' Copy a file into the new folder
' Note that the destination folder path must end with a path separator (\)
oFSO.CopyFile "\\server\folder\file.ext", "C:\MyFolder\"

You may also want to add additional logic, like checking whether the folder you want to create already exists (because CreateFolder raises an error in this case) or specifying whether or not to overwrite the file being copied. So, you can end up with this:

Const strFolder = "C:\MyFolder\", strFile = "\\server\folder\file.ext"
Const Overwrite = True
Dim oFSO

Set oFSO = CreateObject("Scripting.FileSystemObject")

If Not oFSO.FolderExists(strFolder) Then
  oFSO.CreateFolder strFolder
End If

oFSO.CopyFile strFile, strFolder, Overwrite

How to show all shared libraries used by executables in Linux?

Check shared library dependencies of a program executable

To find out what libraries a particular executable depends on, you can use ldd command. This command invokes dynamic linker to find out library dependencies of an executable.

> $ ldd /path/to/program

Note that it is NOT recommended to run ldd with any untrusted third-party executable because some versions of ldd may directly invoke the executable to identify its library dependencies, which can be security risk.

Instead, a safer way to show library dependencies of an unknown application binary is to use the following command.

$ objdump -p /path/to/program | grep NEEDED

for more info

NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver

None of the above helped for me.

I am using Kubernetes on Google Cloud with tesla k-80 gpu.

Follow along this guide to ensure you installed everything correctly: https://cloud.google.com/kubernetes-engine/docs/how-to/gpus

I was missing few important things:

Installing NVIDIA GPU device drivers On your NODES. To do this use:

For COS node:

kubectl apply -f https://raw.githubusercontent.com/GoogleCloudPlatform/container-engine-accelerators/master/nvidia-driver-installer/cos/daemonset-preloaded.yaml

For UBUNTU node:

kubectl apply -f https://raw.githubusercontent.com/GoogleCloudPlatform/container-engine-accelerators/master/nvidia-driver-installer/ubuntu/daemonset-preloaded.yaml

Make sure an update was rolled to your nodes. Restart them if upgrades are off.

I use this image nvidia/cuda:10.1-base-ubuntu16.04 in my docker
You have to set gpu limit! This is the only way the node driver can communicate with the pod. In your yaml configuration add this under your container:
```
resources:
  limits:
    nvidia.com/gpu: 1
```

How do I get 'date-1' formatted as mm-dd-yyyy using PowerShell?

You can use the .tostring() method with datetime format specifiers to format to whatever you need:

http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

(Get-Date).AddDays(-1).ToString('MM-dd-yyyy')
11-01-2013

AngularJS ui router passing data between states without URL

We can use params, new feature of the UI-Router:

API Reference / ui.router.state / $stateProvider

params A map which optionally configures parameters declared in the url, or defines additional non-url parameters. For each parameter being configured, add a configuration object keyed to the name of the parameter.

See the part: "...or defines additional non-url parameters..."

So the state def would be:

$stateProvider
  .state('home', {
    url: "/home",
    templateUrl: 'tpl.html',
    params: { hiddenOne: null, }
  })

Few examples form the doc mentioned above:

// define a parameter's default value
params: {
  param1: { value: "defaultValue" }
}
// shorthand default values
params: {
  param1: "defaultValue",
  param2: "param2Default"
}

// param will be array []
params: {
  param1: { array: true }
}

// handling the default value in url:
params: {
  param1: {
    value: "defaultId",
    squash: true
} }
// squash "defaultValue" to "~"
params: {
  param1: {
    value: "defaultValue",
    squash: "~"
  } }

EXTEND - working example: http://plnkr.co/edit/inFhDmP42AQyeUBmyIVl?p=info

Here is an example of a state definition:

 $stateProvider
  .state('home', {
      url: "/home",
      params : { veryLongParamHome: null, },
      ...
  })
  .state('parent', {
      url: "/parent",
      params : { veryLongParamParent: null, },
      ...
  })
  .state('parent.child', { 
      url: "/child",
      params : { veryLongParamChild: null, },
      ...
  })

This could be a call using ui-sref:

<a ui-sref="home({veryLongParamHome:'Home--f8d218ae-d998-4aa4-94ee-f27144a21238'
  })">home</a>

<a ui-sref="parent({ 
    veryLongParamParent:'Parent--2852f22c-dc85-41af-9064-d365bc4fc822'
  })">parent</a>

<a ui-sref="parent.child({
    veryLongParamParent:'Parent--0b2a585f-fcef-4462-b656-544e4575fca5',  
    veryLongParamChild:'Child--f8d218ae-d998-4aa4-94ee-f27144a61238'
  })">parent.child</a>

Check the example here

When should null values of Boolean be used?

There are many uses for the **null** value in the Boolean wrapper! :)

For example, you may have in a form a field named "newsletter" that indicate if the user want or doesn't want a newsletter from your site. If the user doesn't select a value in this field, you may want to implement a default behaviour to that situation (send? don't send?, question again?, etc) . Clearly, not set (or not selected or **null**), is not the same that true or false.

But, if "not set" doesn't apply to your model, don't change the boolean primitive ;)

PHP checkbox set to check based on database value

Add this code inside your input tag

<?php if ($tag_1 == 'yes') echo "checked='checked'"; ?>

SQL query to select dates between two dates

Try this:

select Date,TotalAllowance from Calculation where EmployeeId=1
             and [Date] between '2011/02/25' and '2011/02/27'

The date values need to be typed as strings.

To ensure future-proofing your query for SQL Server 2008 and higher, Date should be escaped because it's a reserved word in later versions.

Bear in mind that the dates without times take midnight as their defaults, so you may not have the correct value there.

Get attribute name value of <input>

var value_input = $("input[name*='xxxx']").val();

How to add bootstrap in angular 6 project?

using command

npm install bootstrap --save

open .angular.json old (.angular-cli.json ) file find the "styles" add the bootstrap css file

"styles": [
       "src/styles.scss",
       "node_modules/bootstrap/dist/css/bootstrap.min.css"
],

Executing a batch file in a remote machine through PsExec

You have an extra -c you need to get rid of:

psexec -u administrator -p force \\135.20.230.160 -s -d cmd.exe /c "C:\Amitra\bogus.bat"

A monad is just a monoid in the category of endofunctors, what's the problem?

First, the extensions and libraries that we're going to use:

{-# LANGUAGE RankNTypes, TypeOperators #-}

import Control.Monad (join)

Of these, RankNTypes is the only one that's absolutely essential to the below. I once wrote an explanation of RankNTypes that some people seem to have found useful, so I'll refer to that.

Quoting Tom Crockett's excellent answer, we have:

A monad is...

An endofunctor, T : X -> X

A natural transformation, µ : T × T -> T, where × means functor composition

A natural transformation, ? : I -> T, where I is the identity endofunctor on X

...satisfying these laws:

µ(µ(T × T) × T)) = µ(T × µ(T × T))

µ(?(T)) = T = µ(T(?))

How do we translate this to Haskell code? Well, let's start with the notion of a natural transformation:

-- | A natural transformations between two 'Functor' instances.  Law:
--
-- > fmap f . eta g == eta g . fmap f
--
-- Neat fact: the type system actually guarantees this law.
--
newtype f :-> g =
    Natural { eta :: forall x. f x -> g x }

A type of the form f :-> g is analogous to a function type, but instead of thinking of it as a function between two types (of kind *), think of it as a morphism between two functors (each of kind * -> *). Examples:

listToMaybe :: [] :-> Maybe
listToMaybe = Natural go
    where go [] = Nothing
          go (x:_) = Just x

maybeToList :: Maybe :-> []
maybeToList = Natural go
    where go Nothing = []
          go (Just x) = [x]

reverse' :: [] :-> []
reverse' = Natural reverse

Basically, in Haskell, natural transformations are functions from some type f x to another type g x such that the x type variable is "inaccessible" to the caller. So for example, sort :: Ord a => [a] -> [a] cannot be made into a natural transformation, because it's "picky" about which types we may instantiate for a. One intuitive way I often use to think of this is the following:

A functor is a way of operating on the content of something without touching the structure.
A natural transformation is a way of operating on the structure of something without touching or looking at the content.

Now, with that out of the way, let's tackle the clauses of the definition.

The first clause is "an endofunctor, T : X -> X." Well, every Functor in Haskell is an endofunctor in what people call "the Hask category," whose objects are Haskell types (of kind *) and whose morphisms are Haskell functions. This sounds like a complicated statement, but it's actually a very trivial one. All it means is that that a Functor f :: * -> * gives you the means of constructing a type f a :: * for any a :: * and a function fmap f :: f a -> f b out of any f :: a -> b, and that these obey the functor laws.

Second clause: the Identity functor in Haskell (which comes with the Platform, so you can just import it) is defined this way:

newtype Identity a = Identity { runIdentity :: a }

instance Functor Identity where
    fmap f (Identity a) = Identity (f a)

So the natural transformation ? : I -> T from Tom Crockett's definition can be written this way for any Monad instance t:

return' :: Monad t => Identity :-> t
return' = Natural (return . runIdentity)

Third clause: The composition of two functors in Haskell can be defined this way (which also comes with the Platform):

newtype Compose f g a = Compose { getCompose :: f (g a) }

-- | The composition of two 'Functor's is also a 'Functor'.
instance (Functor f, Functor g) => Functor (Compose f g) where
    fmap f (Compose fga) = Compose (fmap (fmap f) fga)

So the natural transformation µ : T × T -> T from Tom Crockett's definition can be written like this:

join' :: Monad t => Compose t t :-> t
join' = Natural (join . getCompose)

The statement that this is a monoid in the category of endofunctors then means that Compose (partially applied to just its first two parameters) is associative, and that Identity is its identity element. I.e., that the following isomorphisms hold:

Compose f (Compose g h) ~= Compose (Compose f g) h
Compose f Identity ~= f
Compose Identity g ~= g

These are very easy to prove because Compose and Identity are both defined as newtype, and the Haskell Reports define the semantics of newtype as an isomorphism between the type being defined and the type of the argument to the newtype's data constructor. So for example, let's prove Compose f Identity ~= f:

Compose f Identity a
    ~= f (Identity a)                 -- newtype Compose f g a = Compose (f (g a))
    ~= f a                            -- newtype Identity a = Identity a
Q.E.D.

How to format a DateTime in PowerShell

For anyone trying to format the current date for use in an HTTP header use the "r" format (short for RFC1123) but beware the caveat...

PS C:\Users\Me> (get-date).toString("r")
Thu, 16 May 2019 09:20:13 GMT
PS C:\Users\Me> get-date -format r
Thu, 16 May 2019 09:21:01 GMT
PS C:\Users\Me> (get-date).ToUniversalTime().toString("r")
Thu, 16 May 2019 16:21:37 GMT

I.e. Don't forget to use "ToUniversalTime()"

push() a two-dimensional array

You have some errors in your code:

Use myArray[i].push( 0 ); to add a new column. Your code (myArray[i][j].push(0);) would work in a 3-dimensional array as it tries to add another element to an array at position [i][j].
You only expand (col-d)-many columns in all rows, even in those, which haven't been initialized yet and thus have no entries so far.

One correct, although kind of verbose version, would be the following:

var r = 3; //start from rows 3

var rows = 8;
var cols = 7;

// expand to have the correct amount or rows
for( var i=r; i<rows; i++ ) {
  myArray.push( [] );
}

// expand all rows to have the correct amount of cols
for (var i = 0; i < rows; i++)
{
    for (var j =  myArray[i].length; j < cols; j++)
    {
        myArray[i].push(0);
    }
}

JavaScript ternary operator example with functions

There is nothing particularly tricky about the example you posted.

In a ternary operator, the first argument (the conditional) is evaluated and if the result is true, the second argument is evaluated and returned, otherwise, the third is evaluated and returned. Each of those arguments can be any valid code block, including function calls.

Think of it this way:

var x = (1 < 2) ? true : false;

Could also be written as:

var x = (1 < 2) ? getTrueValue() : getFalseValue();

This is perfectly valid, and those functions can contain any arbitrary code, whether it is related to returning a value or not. Additionally, the results of the ternary operation don't have to be assigned to anything, just as function results do not have to be assigned to anything:

(1 < 2) ? getTrueValue() : getFalseValue();

Now simply replace those with any arbitrary functions, and you are left with something like your example:

(1 < 2) ? removeItem($this) : addItem($this);

Now your last example really doesn't need a ternary at all, as it can be written like this:

x = (1 < 2);  // x will be set to "true"

How to increment datetime by custom months in python without using library

Similar in ideal to Dave Webb's solution, but without all of that tricky modulo arithmetic:

import datetime, calendar

def increment_month(date):
    # Go to first of this month, and add 32 days to get to the next month
    next_month = date.replace(day=1) + datetime.timedelta(32)
    # Get the day of month that corresponds
    day = min(date.day, calendar.monthrange(next_month.year, next_month.month)[1])
    return next_month.replace(day=day)

String to Dictionary in Python

This data is JSON! You can deserialize it using the built-in json module if you're on Python 2.6+, otherwise you can use the excellent third-party simplejson module.

import json    # or `import simplejson as json` if on Python < 2.6

json_string = u'{ "id":"123456789", ... }'
obj = json.loads(json_string)    # obj now contains a dict of the data

Changing the color of a clicked table row using jQuery

Remove the second id declaration of table:

<table id="data" border="1" cellspacing="1" width="500" **id="table1"**>

CSV with comma or semicolon?

In Windows it is dependent on the "Regional and Language Options" customize screen where you find a List separator. This is the char Windows applications expect to be the CSV separator.

Of course this only has effect in Windows applications, for example Excel will not automatically split data into columns if the file is not using the above mentioned separator. All applications that use Windows regional settings will have this behavior.

If you are writing a program for Windows that will require importing the CSV in other applications and you know that the list separator set for your target machines is ,, then go for it, otherwise I prefer ; since it causes less problems with decimal points, digit grouping and does not appear in much text.

How to send file contents as body entity using cURL

In my case, @ caused some sort of encoding problem, I still prefer my old way:

curl -d "$(cat /path/to/file)" https://example.com

80-characters / right margin line in Sublime Text 3

For this to work, your font also needs to be set to monospace.
If you think about it, lines can't otherwise line up perfectly perfectly.

This answer is detailed at sublime text forum:
http://www.sublimetext.com/forum/viewtopic.php?f=3&p=42052
This answer has links for choosing an appropriate font for your OS,
and gives an answer to an edge case of fonts not lining up.

Another website that lists great monospaced free fonts for programmers. http://hivelogic.com/articles/top-10-programming-fonts

On stackoverflow, see:

Michael Ruth's answer here: How to make ruler always be shown in Sublime text 2?

MattDMo's answer here: What is the default font of Sublime Text?

I have rulers set at the following:
30
50 (git commit message titles should be limited to 50 characters)
72 (git commit message details should be limited to 72 characters)
80 (Windows Command Console Window maxes out at 80 character width)

Other viewing environments that benefit from shorter lines: github: there is no word wrap when viewing a file online
So, I try to keep .js .md and other files at 70-80 characters.
Windows Console: 80 characters.

What are ODEX files in Android?

ART

According to the docs: http://web.archive.org/web/20170909233829/https://source.android.com/devices/tech/dalvik/configure an .odex file:

contains AOT compiled code for methods in the APK.

Furthermore, they appear to be regular shared libraries, since if you get any app, and check:

file /data/app/com.android.appname-*/oat/arm64/base.odex

it says:

base.odex: ELF shared object, 64-bit LSB arm64, stripped

and aarch64-linux-gnu-objdump -d base.odex seems to work and give some meaningful disassembly (but also some rubbish sections).

How to make custom error pages work in ASP.NET MVC 4

There seem to be a number of steps here jumbled together. I'll put forward what I did from scratch.

Create the ErrorPage controller

public class ErrorPageController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult Oops(int id)
    {
        Response.StatusCode = id;
        return View();
    }
}

Add views for these two actions (right click -> Add View). These should appear in a folder called ErrorPage.

Inside App_Start open up FilterConfig.cs and comment out the error handling filter.

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    // Remove this filter because we want to handle errors ourselves via the ErrorPage controller
    //filters.Add(new HandleErrorAttribute());
}

Inside web.config add the following <customerErrors> entries, under System.Web

<customErrors mode="On" defaultRedirect="~/ErrorPage/Oops">
    <error redirect="~/ErrorPage/Oops/404" statusCode="404" />
    <error redirect="~/ErrorPage/Oops/500" statusCode="500" />
</customErrors>

Test (of course). Throw an unhandled exception in your code and see it go to the page with id 500, and then use a URL to a page that does not exist to see 404.

MySQL date format DD/MM/YYYY select query?

SELECT DATE_FORMAT(COLUMN_NAME, "%d/%m/%Y %h:%i %p");

SELECT DATE_FORMAT("2019-05-10 19:30:10", "%d/%m/%Y %h:%i %p");

OUTPUT is 10/05/2019 07:30 PM

How to do an INNER JOIN on multiple columns

something like....

SELECT f.*
      ,a1.city as from
      ,a2.city as to
FROM flights f
INNER JOIN airports a1
ON f.fairport = a1. code
INNER JOIN airports a2
ON f.tairport = a2. code

Bind a function to Twitter Bootstrap Modal Close

I would do it like this:

$('body').on('hidden.bs.modal', '#myModal', function(){ //this call your method });

The rest has already been written by others. I also recommend reading the documentation:jquery - on method

Return outside function error in Python

It basically occours when you return from a loop you can only return from function

How to copy Outlook mail message into excel using VBA or Macros

Since you have not mentioned what needs to be copied, I have left that section empty in the code below.

Also you don't need to move the email to the folder first and then run the macro in that folder. You can run the macro on the incoming mail and then move it to the folder at the same time.

This will get you started. I have commented the code so that you will not face any problem understanding it.

First paste the below mentioned code in the outlook module.

Then

Click on Tools~~>Rules and Alerts
Click on "New Rule"
Click on "start from a blank rule"
Select "Check messages When they arrive"
Under conditions, click on "with specific words in the subject"
Click on "specific words" under rules description.
Type the word that you want to check in the dialog box that pops up and click on "add".
Click "Ok" and click next
Select "move it to specified folder" and also select "run a script" in the same box
In the box below, specify the specific folder and also the script (the macro that you have in module) to run.
Click on finish and you are done.

When the new email arrives not only will the email move to the folder that you specify but data from it will be exported to Excel as well.

UNTESTED

Const xlUp As Long = -4162

Sub ExportToExcel(MyMail As MailItem)
    Dim strID As String, olNS As Outlook.Namespace
    Dim olMail As Outlook.MailItem
    Dim strFileName As String

    '~~> Excel Variables
    Dim oXLApp As Object, oXLwb As Object, oXLws As Object
    Dim lRow As Long

    strID = MyMail.EntryID
    Set olNS = Application.GetNamespace("MAPI")
    Set olMail = olNS.GetItemFromID(strID)

    '~~> Establish an EXCEL application object
    On Error Resume Next
    Set oXLApp = GetObject(, "Excel.Application")

    '~~> If not found then create new instance
    If Err.Number <> 0 Then
        Set oXLApp = CreateObject("Excel.Application")
    End If
    Err.Clear
    On Error GoTo 0

    '~~> Show Excel
    oXLApp.Visible = True

    '~~> Open the relevant file
    Set oXLwb = oXLApp.Workbooks.Open("C:\Sample.xls")

    '~~> Set the relevant output sheet. Change as applicable
    Set oXLws = oXLwb.Sheets("Sheet1")

    lRow = oXLws.Range("A" & oXLApp.Rows.Count).End(xlUp).Row + 1

    '~~> Write to outlook
    With oXLws
        '
        '~~> Code here to output data from email to Excel File
        '~~> For example
        '
        .Range("A" & lRow).Value = olMail.Subject
        .Range("B" & lRow).Value = olMail.SenderName
        '
    End With

    '~~> Close and Clean up Excel
    oXLwb.Close (True)
    oXLApp.Quit
    Set oXLws = Nothing
    Set oXLwb = Nothing
    Set oXLApp = Nothing

    Set olMail = Nothing
    Set olNS = Nothing
End Sub

FOLLOWUP

To extract the contents from your email body, you can split it using SPLIT() and then parsing out the relevant information from it. See this example

Dim MyAr() As String

MyAr = Split(olMail.body, vbCrLf)

For i = LBound(MyAr) To UBound(MyAr)
    '~~> This will give you the contents of your email
    '~~> on separate lines
    Debug.Print MyAr(i)
Next i

MySQL does not start when upgrading OSX to Yosemite or El Capitan

My Mac decided to restart itself randomly; causing a whole slew of errors. One of which, was mysql refusing to start up properly. I went through many SO questions/answers as well as other sites.

Ultimately what ended up resolving MY issue was this:

1) Creating the file (/usr/local/mysql/data/.local.pid

2) chmod 777 on that file

3) executing mysql.server start (mine was located in/usr/local/bin/mysql.server)

How to get SQL from Hibernate Criteria API (not for logging)

This answer is based on user3715338's answer (with a small spelling error corrected) and mixed with Michael's answer for Hibernate 3.6 - based on the accepted answer from Brian Deterling. I then extended it (for PostgreSQL) with a couple more types replacing the questionmarks:

public static String toSql(Criteria criteria)
{
    String sql = "";
    Object[] parameters = null;
    try
    {
        CriteriaImpl criteriaImpl = (CriteriaImpl) criteria;
        SessionImpl sessionImpl = (SessionImpl) criteriaImpl.getSession();
        SessionFactoryImplementor factory = sessionImpl.getSessionFactory();
        String[] implementors = factory.getImplementors(criteriaImpl.getEntityOrClassName());
        OuterJoinLoadable persister = (OuterJoinLoadable) factory.getEntityPersister(implementors[0]);
        LoadQueryInfluencers loadQueryInfluencers = new LoadQueryInfluencers();
        CriteriaLoader loader = new CriteriaLoader(persister, factory,
            criteriaImpl, implementors[0].toString(), loadQueryInfluencers);
        Field f = OuterJoinLoader.class.getDeclaredField("sql");
        f.setAccessible(true);
        sql = (String) f.get(loader);
        Field fp = CriteriaLoader.class.getDeclaredField("translator");
        fp.setAccessible(true);
        CriteriaQueryTranslator translator = (CriteriaQueryTranslator) fp.get(loader);
        parameters = translator.getQueryParameters().getPositionalParameterValues();
    }
    catch (Exception e)
    {
        throw new RuntimeException(e);
    }
    if (sql != null)
    {
        int fromPosition = sql.indexOf(" from ");
        sql = "\nSELECT * " + sql.substring(fromPosition);

        if (parameters != null && parameters.length > 0)
        {
            for (Object val : parameters)
            {
                String value = "%";
                if (val instanceof Boolean)
                {
                    value = ((Boolean) val) ? "1" : "0";
                }
                else if (val instanceof String)
                {
                    value = "'" + val + "'";
                }
                else if (val instanceof Number)
                {
                    value = val.toString();
                }
                else if (val instanceof Class)
                {
                    value = "'" + ((Class) val).getCanonicalName() + "'";
                }
                else if (val instanceof Date)
                {
                    SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd HH:mm:ss.SSS");
                    value = "'" + sdf.format((Date) val) + "'";
                }
                else if (val instanceof Enum)
                {
                    value = "" + ((Enum) val).ordinal();
                }
                else
                {
                    value = val.toString();
                }
                sql = sql.replaceFirst("\\?", value);
            }
        }
    }
    return sql.replaceAll("left outer join", "\nleft outer join").replaceAll(
        " and ", "\nand ").replaceAll(" on ", "\non ").replaceAll("<>",
        "!=").replaceAll("<", " < ").replaceAll(">", " > ");
}

How to remove error about glyphicons-halflings-regular.woff2 not found

This problem happens because IIS does not know about woff and woff2 file mime types.

Solution 1:

Add these lines in your web.config project:

 <system.webServer>
  ...
  </modules>
    <staticContent>
      <remove fileExtension=".woff" />
      <mimeMap fileExtension=".woff" mimeType="application/font-woff" />
      <remove fileExtension=".woff2" />
      <mimeMap fileExtension=".woff2" mimeType="font/woff2" />
    </staticContent>

Solution 2:

On IIS project page:

Step 1: Go to your project IIS home page and double click on MIME Types button:

Step 2: Click on Add button from Actions menu:

Step 3: In the middle of the screen appears a window and in this window you need to add the two lines from solution 1:

ViewPager PagerAdapter not updating the View

I actually use notifyDataSetChanged() on ViewPager and CirclePageIndicator and after that I call destroyDrawingCache() on ViewPager and it works.. None of the other solutions worked for me.

Replace substring with another substring C++

std::string replace(std::string str, const std::string& sub1, const std::string& sub2)
{
    if (sub1.empty())
        return str;

    std::size_t pos;
    while ((pos = str.find(sub1)) != std::string::npos)
        str.replace(pos, sub1.size(), sub2);

    return str;
}

How can I implement prepend and append with regular JavaScript?

Here's an example of using prepend to add a paragraph to the document.

var element = document.createElement("p");
var text = document.createTextNode("Example text");
element.appendChild(text);
document.body.prepend(element);

result:

<p>Example text</p>

Occurrences of substring in a string

How about using StringUtils.countMatches from Apache Commons Lang?

String str = "helloslkhellodjladfjhello";
String findStr = "hello";

System.out.println(StringUtils.countMatches(str, findStr));

That outputs:

MySql : Grant read only options?

If you want the view to be read only after granting the read permission you can use the ALGORITHM = TEMPTABLE in you view DDL definition.

go to character in vim

:goto 21490 will take you to the 21490th byte in the buffer.

Check if a file exists or not in Windows PowerShell?

The standard way to see if a file exists is with the Test-Path cmdlet.

Test-Path -path $filename

Test whether string is a valid integer

For portability to pre-Bash 3.1 (when the =~ test was introduced), use expr.

if expr "$string" : '-\?[0-9]\+$' >/dev/null
then
  echo "String is a valid integer."
else
  echo "String is not a valid integer."
fi

expr STRING : REGEX searches for REGEX anchored at the start of STRING, echoing the first group (or length of match, if none) and returning success/failure. This is old regex syntax, hence the excess \. -\? means "maybe -", [0-9]\+ means "one or more digits", and $ means "end of string".

Bash also supports extended globs, though I don't recall from which version onwards.

shopt -s extglob
case "$string" of
    @(-|)[0-9]*([0-9]))
        echo "String is a valid integer." ;;
    *)
        echo "String is not a valid integer." ;;
esac

# equivalently, [[ $string = @(-|)[0-9]*([0-9])) ]]

@(-|) means "- or nothing", [0-9] means "digit", and *([0-9]) means "zero or more digits".

Disable click outside of angular material dialog area to close the dialog (With Angular Version 4.0+)

Add

[config]="{backdrop: 'static'}"

to the model code.

Maintain the aspect ratio of a div with CSS

As stated in here on w3schools.com and somewhat reiterated in this accepted answer, padding values as percentages (emphasis mine):

Specifies the padding in percent of the width of the containing element

Ergo, a correct example of a responsive DIV that keeps a 16:9 aspect ratio is as follows:

CSS

.parent {
    position: relative;
    width: 100%;
}
.child {
    position: relative;
    padding-bottom: calc(100% * 9 / 16);
}
.child > div {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

HTML

<div class="parent">
    <div class="child">
        <div>Aspect is kept when resizing</div>
    </div>
</div>

Demo on JSFiddle

What is the Java ?: operator called and what does it do?

int count = isHere ? getHereCount(index) : getAwayCount(index);

means :

if (isHere) {
    count = getHereCount(index);
} else {
    count = getAwayCount(index);
}

Using the GET parameter of a URL in JavaScript

You can use this function

function getParmFromUrl(url, parm) {
    var re = new RegExp(".*[?&]" + parm + "=([^&]+)(&|$)");
    var match = url.match(re);
    return(match ? match[1] : "");
}

Download & Install Xcode version without Premium Developer Account

I am able to download it using apple's download website today. https://developer.apple.com/download/

I do not have a paid apple developer account. Before I was only able to see xcode 8.3.3 but somehow today xcode 9 beta also appeared.

A Java collection of value pairs? (tuples?)

First Thing on my mind when talking about key/value pairs is the Properties Class where you can save and load items to a stream/file.

fatal: does not appear to be a git repository

You've got the syntax for the scp-style way of specifying a repository slightly wrong - it has to be:

[user@]host.xz:path/to/repo.git/

... as you can see in the git clone documentation. You should use instead the URL:

[email protected]:/gittest.git

i.e. in the URL you're using, you missed out the : (colon)

To update the URL for origin you could do:

git remote set-url origin [email protected]:/gittest.git

document.createElement("script") synchronously

function include(file){
return new Promise(function(resolve, reject){
        var script = document.createElement('script');
        script.src = file;
        script.type ='text/javascript';
        script.defer = true;
        document.getElementsByTagName('head').item(0).appendChild(script);

        script.onload = function(){
        resolve()
        }
        script.onerror = function(){
          reject()
        }
      })

 /*I HAVE MODIFIED THIS TO  BE PROMISE-BASED 
   HOW TO USE THIS FUNCTION 

  include('js/somefile.js').then(function(){
  console.log('loaded');
  },function(){
  console.log('not loaded');
  })
  */
}

Check if element found in array c++

Using Newton C++

bool exists_linear( INPUT_ITERATOR first, INPUT_ITERATOR last, const T& value )

bool exists_binary( INPUT_ITERATOR first, INPUT_ITERATOR last, const T& value )

the code will be something like this:

if ( newton::exists_linear(arr.begin(), arr.end(), value) )
   std::cout << "found" << std::endl;
else
   std::cout << "not found" << std::endl;

both exists_linear and exists_binary use std implementations. binary use std::binary_search, and linear use std::find, but return directly a bool, not an iterator.

Error Code: 1290. The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

The code above exports data without the heading columns which is weird. Here's how to do it. You have to merge the two files later though using text a editor.

SELECT column_name FROM information_schema.columns WHERE table_schema = 'my_app_db' AND table_name = 'customers' INTO OUTFILE 'C:/ProgramData/MySQL/MySQL Server 5.6/Uploads/customers_heading_cols.csv' FIELDS TERMINATED BY '' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY ',';

No MediaTypeFormatter is available to read an object of type 'String' from content with media type 'text/plain'

Or you can just create your own MediaTypeFormatter. I use this for text/html. If you add text/plain to it, it'll work for you too:

public class TextMediaTypeFormatter : MediaTypeFormatter
{
    public TextMediaTypeFormatter()
    {
        SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
    }

    public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
    {
        return ReadFromStreamAsync(type, readStream, content, formatterLogger, CancellationToken.None);
    }

    public override async Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
    {
        using (var streamReader = new StreamReader(readStream))
        {
            return await streamReader.ReadToEndAsync();
        }
    }

    public override bool CanReadType(Type type)
    {
        return type == typeof(string);
    }

    public override bool CanWriteType(Type type)
    {
        return false;
    }
}

Finally you have to assign this to the HttpMethodContext.ResponseFormatter property.

WHERE Clause to find all records in a specific month

More one tip very simple. You also could use to_char function, look:

For Month:

to_char(happened_at , 'MM') = 01

For Year:

to_char(happened_at , 'YYYY') = 2009

For Day:

to_char(happened_at , 'DD') = 01

to_char funcion is suported by sql language and not by one specific database.

I hope help anybody more...

Abs!

Insert json file into mongodb

Open command prompt separately and check:

C:\mongodb\bin\mongoimport --db db_name --collection collection_name< filename.json

Finding length of char array

You can do len = sizeof(a)/sizeof(*a) for any kind of array. But, you have initialized it as a[7] = {...} meaning its length is 7...

In .NET, which loop runs faster, 'for' or 'foreach'?

The differences in speed in a for- and a foreach-loop are tiny when you're looping through common structures like arrays, lists, etc, and doing a LINQ query over the collection is almost always slightly slower, although it's nicer to write! As the other posters said, go for expressiveness rather than a millisecond of extra performance.

What hasn't been said so far is that when a foreach loop is compiled, it is optimised by the compiler based on the collection it is iterating over. That means that when you're not sure which loop to use, you should use the foreach loop - it will generate the best loop for you when it gets compiled. It's more readable too.

Another key advantage with the foreach loop is that if your collection implementation changes (from an int array to a List<int> for example) then your foreach loop won't require any code changes:

foreach (int i in myCollection)

The above is the same no matter what type your collection is, whereas in your for loop, the following will not build if you changed myCollection from an array to a List:

for (int i = 0; i < myCollection.Length, i++)

How to retry image pull in a kubernetes Pods?

Most probably the issue of ImagePullBackOff is due to either the image not being present or issue with the pod YAML file.

What I will do is this

kubectl get pod -n $namespace $POD_NAME --export > pod.yaml | kubectl -f apply -

I would also see the pod.yaml to see the why the earlier pod didn't work

Ambiguous overload call to abs(double)

Use fabs() instead of abs(), it's the same but for floats instead of integers.

Getting request URL in a servlet

The getRequestURL() omits the port when it is 80 while the scheme is http, or when it is 443 while the scheme is https.

So, just use getRequestURL() if all you want is obtaining the entire URL. This does however not include the GET query string. You may want to construct it as follows then:

StringBuffer requestURL = request.getRequestURL();
if (request.getQueryString() != null) {
    requestURL.append("?").append(request.getQueryString());
}
String completeURL = requestURL.toString();

Create a circular button in BS3

I had the same problem and came up with a very simple solution working for all (xs, sm, normal and lg) buttons more or less:

.btn-circle {
    border-radius: 50%;
    padding: 0.1em;
    width:1.8em;
}

The difference between the btn-xs and -sm are only their padding. And this is not covered with this snippet. This snippet calculates the sizes based on the font-size only.

How to enable mbstring from php.ini?

All XAMPP packages come with Multibyte String (php_mbstring.dll) extension installed.

If you have accidentally removed DLL file from php/ext folder, just add it back (get the copy from XAMPP zip archive - its downloadable).

If you have deleted the accompanying INI configuration line from php.ini file, add it back as well:

extension=php_mbstring.dll

Also, ensure to restart your webserver (Apache) using XAMPP control panel.

Additional Info on Enabling PHP Extensions

install extension (e.g. put php_mbstring.dll into /XAMPP/php/ext directory)
in php.ini, ensure extension directory specified (e.g. extension_dir = "ext")
ensure correct build of DLL file (e.g. 32bit thread-safe VC9 only works with DLL files built using exact same tools and configuration: 32bit thread-safe VC9)
ensure PHP API versions match (If not, once you restart the webserver you will receive related error.)

MongoDB: Combine data from multiple collections into one..how?

Yes you can: Take this utility function that I have written today:

function shangMergeCol() {
  tcol= db.getCollection(arguments[0]);
  for (var i=1; i<arguments.length; i++){
    scol= db.getCollection(arguments[i]);
    scol.find().forEach(
        function (d) {
            tcol.insert(d);
        }
    )
  }
}

You can pass to this function any number of collections, the first one is going to be the target one. All the rest collections are sources to be transferred to the target one.

MessageBox with YesNoCancel - No & Cancel triggers same event

Closing conformation alert:

Private Sub cmd_exit_click()

    ' By clicking on the button the MsgBox will appear
    If MsgBox("Are you sure want to exit now?", MsgBoxStyle.YesNo, "closing warning") = MsgBoxResult.Yes Then ' If you select yes in the MsgBox then it will close the window
               Me.Close() ' Close the window
    Else
        ' Will not close the application
    End If
End Sub

Unable to merge dex

I tried all the above and none of them helps. finally, I find this work for me:

app/build.gradle:

android {
    defaultConfig {
       multiDexEnabled true
    }
}

How to start debug mode from command prompt for apache tomcat server?

A short answer is to add the following options when the JVM is started.

JAVA_OPTS=" $JAVA_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8080"

Recursive sub folder search and return files in a list python

If you don't mind installing an additional light library, you can do this:

pip install plazy

Usage:

import plazy

txt_filter = lambda x : True if x.endswith('.txt') else False
files = plazy.list_files(root='data', filter_func=txt_filter, is_include_root=True)

The result should look something like this:

['data/a.txt', 'data/b.txt', 'data/sub_dir/c.txt']

It works on both Python 2.7 and Python 3.

Github: https://github.com/kyzas/plazy#list-files

Disclaimer: I'm an author of plazy.

How can I parse a string with a comma thousand separator to a number?

Usually you should consider to use input fields which don't allow free text input for numeric values. But there might be cases, when you need to guess the input format. For example 1.234,56 in Germany means 1,234.56 in US. See https://salesforce.stackexchange.com/a/21404 for a list of countries which use comma as decimal.

I use the following function to do a best guess and strip off all non-numeric characters:

function parseNumber(strg) {
    var strg = strg || "";
    var decimal = '.';
    strg = strg.replace(/[^0-9$.,]/g, '');
    if(strg.indexOf(',') > strg.indexOf('.')) decimal = ',';
    if((strg.match(new RegExp("\\" + decimal,"g")) || []).length > 1) decimal="";
    if (decimal != "" && (strg.length - strg.indexOf(decimal) - 1 == 3) && strg.indexOf("0" + decimal)!==0) decimal = "";
    strg = strg.replace(new RegExp("[^0-9$" + decimal + "]","g"), "");
    strg = strg.replace(',', '.');
    return parseFloat(strg);
}

Try it here: https://plnkr.co/edit/9p5Y6H?p=preview

Examples:

1.234,56 € => 1234.56
1,234.56USD => 1234.56
1,234,567€ => 1234567
1.234.567 => 1234567
1,234.567 => 1234.567
1.234 => 1234 // might be wrong - best guess
1,234 => 1234 // might be wrong - best guess
1.2345 => 1.2345
0,123 => 0.123

The function has one weak point: It is not possible to guess the format if you have 1,123 or 1.123 - because depending on the locale format both might be a comma or a thousands-separator. In this special case the function will treat separator as a thousands-separator and return 1123.

Java 8 Filter Array Using Lambda

even simpler, adding up to String[],

use built-in filter filter(StringUtils::isNotEmpty) of org.apache.commons.lang3

import org.apache.commons.lang3.StringUtils;

    String test = "a\nb\n\nc\n";
    String[] lines = test.split("\\n", -1);


    String[]  result = Arrays.stream(lines).filter(StringUtils::isNotEmpty).toArray(String[]::new);
    System.out.println(Arrays.toString(lines));
    System.out.println(Arrays.toString(result));

and output: [a, b, , c, ] [a, b, c]

How to view an HTML file in the browser with Visual Studio Code

Open Extensions Sidebar (Ctrl + Shift + X)
Search for open in browser and install it
Right click on your html file, and select "Open in Browser" (Alt + B)

Linux error while loading shared libraries: cannot open shared object file: No such file or directory

I use Ubuntu 18.04

Installing the corresponding "-dev" package worked for me,

sudo apt install libgconf2-dev

I was getting the below error till I installed the above package,

turtl: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory

hexadecimal string to byte array in python

provided I understood correctly, you should look for binascii.unhexlify

import binascii
a='45222e'
s=binascii.unhexlify(a)
b=[ord(x) for x in s]

GroupBy pandas DataFrame and select most common value

The problem here is the performance, if you have a lot of rows it will be a problem.

If it is your case, please try with this:

import pandas as pd

source = pd.DataFrame({'Country' : ['USA', 'USA', 'Russia','USA'], 
              'City' : ['New-York', 'New-York', 'Sankt-Petersburg', 'New-York'],
              'Short_name' : ['NY','New','Spb','NY']})

source.groupby(['Country','City']).agg(lambda x:x.value_counts().index[0])

source.groupby(['Country','City']).Short_name.value_counts().groupby['Country','City']).first()

Convert date to UTC using moment.js

This moment.utc(stringDate, format).toDate() worked for me.

This ~~moment.utc(date).toDate()~~ not.

Debian 8 (Live-CD) what is the standard login and password?

I am using Debian 8 live off a USB. I was locked out of the system after 10 min of inactivity. The password that was required to log back in to the system for the user was:

login : Debian Live User
password : live

I hope this helps

What exactly is the difference between Web API and REST API in MVC?

I have been there, like so many of us. There are so many confusing words like Web API, REST, RESTful, HTTP, SOAP, WCF, Web Services... and many more around this topic. But I am going to give brief explanation of only those which you have asked.

REST

It is neither an API nor a framework. It is just an architectural concept. You can find more details here.

RESTful

I have not come across any formal definition of RESTful anywhere. I believe it is just another buzzword for APIs to say if they comply with REST specifications.

EDIT: There is another trending open source initiative OpenAPI Specification (OAS) (formerly known as Swagger) to standardise REST APIs.

Web API

It in an open source framework for writing HTTP APIs. These APIs can be RESTful or not. Most HTTP APIs we write are not RESTful. This framework implements HTTP protocol specification and hence you hear terms like URIs, request/response headers, caching, versioning, various content types(formats).

Note: I have not used the term Web Services deliberately because it is a confusing term to use. Some people use this as a generic concept, I preferred to call them HTTP APIs. There is an actual framework named 'Web Services' by Microsoft like Web API. However it implements another protocol called SOAP.

Add row to query result using select

In SQL Server, you would say:

Select name from users
UNION [ALL]
SELECT 'JASON'

In Oracle, you would say

Select name from user
UNION [ALL]
Select 'JASON' from DUAL

How can I create a carriage return in my C# string

~~myString += Environment.NewLine;~~

myString = myString + Environment.NewLine;

Calling a JavaScript function named in a variable

This is kinda ugly, but its the first thing that popped in my head. This also should allow you to pass in arguments:

eval('var myfunc = ' + variable);  myfunc(args, ...);

If you don't need to pass in arguments this might be simpler.

eval(variable + '();');

Standard dry-code warning applies.

Getting Git to work with a proxy server - fails with "Request timed out"

This worked for me, in windows XP behind a corporate firewall.

I didnt have to install any local proxy or any other software besides git v1.771 from http://code.google.com/p/msysgit/downloads/list?can=3

$ git config --global http.proxy http://proxyuser:[email protected]:8080
$ git config --system http.sslcainfo /bin/curl-ca-bundle.crt
$ git remote add origin https://mygithubuser:[email protected]/repoUser/repoName.git
$ git push origin master

proxyuser= the proxy user I was assigned by our IT dept, in my case it is the same windows user I use to log in to my PC, the Active Directory user

proxypwd= the password of my proxy user

proxy.server.com:8080 = the proxy name and port, I got it from Control Panel, Internet Options, Connections, Lan Settings button, Advanced button inside the Proxy Server section, use the servername and port on the first (http) row.

mygithubuser = the user I use to log in to github.com

mygithubpwd = the password for my github.com user

repoUser = the user owner of the repo

repoName = the name of the repo

How can I inject a property value into a Spring Bean which was configured using annotations?

If you are stuck using Spring 2.5 you could define a bean for each of your properties and inject them using qualifiers. Like this:

  <bean id="someFile" class="java.io.File">
    <constructor-arg value="${someFile}"/>
  </bean>

and

@Service
public class Thing
      public Thing(@Qualifier("someFile") File someFile) {
...

Its not super readable but it gets the job done.

how to get the value of a textarea in jquery?

You should check the textarea is null before you use val() otherwise, you will get undefined error.

if ($('textarea#message') != undefined) {
   var message = $('textarea#message').val();
}

Then, you could do whatever with message.

Common elements in two lists

    // Create two collections:
    LinkedList<String> listA =  new LinkedList<String>();
    ArrayList<String> listB =  new ArrayList<String>();

    // Add some elements to listA:
    listA.add("A");
    listA.add("B");
    listA.add("C");
    listA.add("D");

    // Add some elements to listB:
    listB.add("A");
    listB.add("B");
    listB.add("C");

    // use 

    List<String> common = new ArrayList<String>(listA);
    // use common.retainAll

    common.retainAll(listB);

    System.out.println("The common collection is : " + common);

Can you change what a symlink points to after it is created?

Yes, you can!

$ ln -sfn source_file_or_directory_name softlink_name

Convert AM/PM time to 24 hours format?

Go through following code to convert the DateTime from 12 hrs to 24 hours.

string currentDateString = DateTime.Now.ToString("dd-MMM-yyyy h:mm tt");
DateTime currentDate = Convert.ToDateTime(currentDateString);
Console.WriteLine("String Current Date: " + currentDateString);
Console.WriteLine("Converted Date: " + currentDate.ToString("dd-MMM-yyyy HH:mm"));

Whenever you want the time should be displayed in24 hours use format "HH"

You can refer following link for further details: Custom Date and Time Format Strings

How do you do natural logs (e.g. "ln()") with numpy in Python?

Correct, np.log(x) is the Natural Log (base e log) of x.

For other bases, remember this law of logs: log-b(x) = log-k(x) / log-k(b) where log-b is the log in some arbitrary base b, and log-k is the log in base k, e.g.

here k = e

l = np.log(x) / np.log(100)

and l is the log-base-100 of x

cocoapods - 'pod install' takes forever

As of 15th August 2016, the repo is a massive 2.39GB file. I opened the Activity Monitor to look at what the terminal was doing. It was downloading this huge file.

Brew doctor says: "Warning: /usr/local/include isn't writable."

You can alias the command to fix this problem in your .bash_profile and run it every time you encounter it:

At the end of the file ~/.bash_profile, add:

alias fix_brew='sudo chown -R $USER /usr/local/'

And now inside your terminal you can run:

$ fix_brew

In VBA get rid of the case sensitivity when comparing words?

There is a statement you can issue at the module level:

Option Compare Text

This makes all "text comparisons" case insensitive. This means the following code will show the message "this is true":

Option Compare Text

Sub testCase()
  If "UPPERcase" = "upperCASE" Then
    MsgBox "this is true: option Compare Text has been set!"
  End If
End Sub

See for example http://www.ozgrid.com/VBA/vba-case-sensitive.htm . I'm not sure it will completely solve the problem for all instances (such as the Application.Match function) but it will take care of all the if a=b statements. As for Application.Match - you may want to convert the arguments to either upper case or lower case using the LCase function.

Have border wrap around text

This is because h1 is a block element, so it will extend across the line (or the width you give).

You can make the border go only around the text by setting display:inline on the h1

Example: http://jsfiddle.net/jonathon/XGRwy/1/

How can I make a checkbox readonly? not disabled?

None of the above worked for me. Here's my vanilla.js solution:

(function() {
    function handleSubmit(event) {
        var form = event.target;
        var nodes = form.querySelectorAll("input[disabled]");
        for (var node of nodes) {
            node.disabled = false;
        }
    }

    function init() {
        var submit_form_tag = document.getElementById('new_whatever');
        submit_form_tag.addEventListener('submit', handleSubmit, true);
    }

    window.onload = init_beworst;

})();

Be sure to provide an appropriate replacement for the form id.

My application has a bit of context, where some boxes are pre-checked, and others you have a limit of how many of the other boxes you can check. When you hit that limit, all the non-pre-checked boxes are disabled, and if you uncheck one all the non-pre-checked boxes are enabled again. When the user presses submit all the checked boxes are submitted to the user, regardless of whether they're pre-checked or not.

how to access parent window object using jquery?

Here is a more literal answer (parent window as opposed to opener) to the original question that can be used within an iframe, assuming the domain name in the iframe matches that of the parent window:

window.parent.$("#serverMsg")

How can I echo a newline in a batch file?

Ken and Jeb solutions works well.

But the new lines are generated with only an LF character and I need CRLF characters (Windows version).

To this, at the end of the script, I have converted LF to CRLF.

Example:

TYPE file.txt | FIND "" /V > file_win.txt
del file.txt
rename file_win.txt file.txt

How to Find App Pool Recycles in Event Log

IIS version 8.5 +

To enable Event Tracing for Windows for your website/application

Go to Logging and ensure either ETW event only or Both log file and ETW event ...is selected.

Enable the desired Recycle logs in the Advanced Settings for the Application Pool:

Go to the default Custom View: WebServer filters IIS logs:

Custom Views > ServerRoles > Web Server

... or System logs:

Windows Logs > System

What's the difference between xsd:include and xsd:import?

The fundamental difference between include and import is that you must use import to refer to declarations or definitions that are in a different target namespace and you must use include to refer to declarations or definitions that are (or will be) in the same target namespace.

Source: https://web.archive.org/web/20070804031046/http://xsd.stylusstudio.com/2002Jun/post08016.htm

How to create a property for a List<T>

You could do this but the T generic parameter needs to be declared at the containing class:

public class Foo<T>
{
    public List<T> NewList { get; set; }
}

Left Join without duplicate rows from left table

You can do this using generic SQL with group by:

SELECT C.Content_ID, C.Content_Title, MAX(M.Media_Id)
FROM tbl_Contents C LEFT JOIN
     tbl_Media M
     ON M.Content_Id = C.Content_Id 
GROUP BY C.Content_ID, C.Content_Title
ORDER BY MAX(C.Content_DatePublished) ASC;

Or with a correlated subquery:

SELECT C.Content_ID, C.Contt_Title,
       (SELECT M.Media_Id
        FROM tbl_Media M
        WHERE M.Content_Id = C.Content_Id
        ORDER BY M.MEDIA_ID DESC
        LIMIT 1
       ) as Media_Id
FROM tbl_Contents C 
ORDER BY C.Content_DatePublished ASC;

Of course, the syntax for limit 1 varies between databases. Could be top. Or rownum = 1. Or fetch first 1 rows. Or something like that.

C: convert double to float, preserving decimal point precision

float and double don't store decimal places. They store binary places: float is (assuming IEEE 754) 24 significant bits (7.22 decimal digits) and double is 53 significant bits (15.95 significant digits).

Converting from double to float will give you the closest possible float, so rounding won't help you. Goining the other way may give you "noise" digits in the decimal representation.

#include <stdio.h>

int main(void) {
    double orig = 12345.67;
    float f = (float) orig;
    printf("%.17g\n", f); // prints 12345.669921875
    return 0;
}

To get a double approximation to the nice decimal value you intended, you can write something like:

double round_to_decimal(float f) {
    char buf[42];
    sprintf(buf, "%.7g", f); // round to 7 decimal digits
    return atof(buf);
}

CSS background-image-opacity?

You can put a second element inside the element you wish to have a transparent background on.

<div class="container">
    <div class="container-background"></div>
    <div class="content">
         Yay, happy content!
    </div>
</div>

Then make the '.container-background' positioned absolutely to cover the parent element. At this point you'll be able to adjust the opacity of it without affecting the opacity of the content inside '.container'.

.container {
    position: relative;
}
.container .container-background {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(background.png);
    opacity: 0.5;
}
.container .content {
    position: relative;
    z-index: 1;
}

Best way to do Version Control for MS Excel

I use git, and today I ported this (git-xlsx-textconv) to Python, since my project is based on Python code, and it interacts with Excel files. This works for at least .xlsx files, but I think it will work for .xls too. Here's the github link. I wrote two versions, one with each row on its own line, and another where each cell is on its own line (the latter was written because git diff doesn't like to wrap long lines by default, at least here on Windows).

This is my .gitconfig file (this allows the differ script to reside in my project's repo):

[diff "xlsx"]
    binary = true
    textconv = python `git rev-parse --show-toplevel`/src/util/git-xlsx-textconv.py

if you want the script to be available for many different repos, then use something like this:

[diff "xlsx"]
    binary = true
    textconv = python C:/Python27/Scripts/git-xlsx-textconv.py

my .gitattributes file:

*.xlsx diff=xlsx

MySQL join with where clause

You need to put it in the join clause, not the where:

SELECT *
FROM categories
LEFT JOIN user_category_subscriptions ON 
    user_category_subscriptions.category_id = categories.category_id
    and user_category_subscriptions.user_id =1

See, with an inner join, putting a clause in the join or the where is equivalent. However, with an outer join, they are vastly different.

As a join condition, you specify the rowset that you will be joining to the table. This means that it evaluates user_id = 1 first, and takes the subset of user_category_subscriptions with a user_id of 1 to join to all of the rows in categories. This will give you all of the rows in categories, while only the categories that this particular user has subscribed to will have any information in the user_category_subscriptions columns. Of course, all other categories will be populated with null in the user_category_subscriptions columns.

Conversely, a where clause does the join, and then reduces the rowset. So, this does all of the joins and then eliminates all rows where user_id doesn't equal 1. You're left with an inefficient way to get an inner join.

Hopefully this helps!

Spring data JPA query with parameter properties

You can try something like this:

public interface PersonRepository extends CrudRepository<Person, Long> {
       @Query("select p from Person AS p"
       + " ,Name AS n"  
       + " where p.forename = n.forename "
       + " and p.surname = n.surname"
       + " and n = :name")
       Set<Person>findByName(@Param("name") Name name);
    }

Creating a custom JButton in Java

You could always try the Synth look & feel. You provide an xml file that acts as a sort of stylesheet, along with any images you want to use. The code might look like this:

try {
    SynthLookAndFeel synth = new SynthLookAndFeel();
    Class aClass = MainFrame.class;
    InputStream stream = aClass.getResourceAsStream("\\default.xml");

    if (stream == null) {
        System.err.println("Missing configuration file");
        System.exit(-1);                
    }

    synth.load(stream, aClass);

    UIManager.setLookAndFeel(synth);
} catch (ParseException pe) {
    System.err.println("Bad configuration file");
    pe.printStackTrace();
    System.exit(-2);
} catch (UnsupportedLookAndFeelException ulfe) {
    System.err.println("Old JRE in use. Get a new one");
    System.exit(-3);
}

From there, go on and add your JButton like you normally would. The only change is that you use the setName(string) method to identify what the button should map to in the xml file.

The xml file might look like this:

<synth>
    <style id="button">
        <font name="DIALOG" size="12" style="BOLD"/>
        <state value="MOUSE_OVER">
            <imagePainter method="buttonBackground" path="dirt.png" sourceInsets="2 2 2 2"/>
            <insets top="2" botton="2" right="2" left="2"/>
        </state>
        <state value="ENABLED">
            <imagePainter method="buttonBackground" path="dirt.png" sourceInsets="2 2 2 2"/>
            <insets top="2" botton="2" right="2" left="2"/>
        </state>
    </style>
    <bind style="button" type="name" key="dirt"/>
</synth>

The bind element there specifies what to map to (in this example, it will apply that styling to any buttons whose name property has been set to "dirt").

And a couple of useful links:

http://javadesktop.org/articles/synth/

http://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/synth.html

Google Maps V3 - How to calculate the zoom level for a given bounds

Thanks to Giles Gardam for his answer, but it addresses only longitude and not latitude. A complete solution should calculate the zoom level needed for latitude and the zoom level needed for longitude, and then take the smaller (further out) of the two.

Here is a function that uses both latitude and longitude:

function getBoundsZoomLevel(bounds, mapDim) {
    var WORLD_DIM = { height: 256, width: 256 };
    var ZOOM_MAX = 21;

    function latRad(lat) {
        var sin = Math.sin(lat * Math.PI / 180);
        var radX2 = Math.log((1 + sin) / (1 - sin)) / 2;
        return Math.max(Math.min(radX2, Math.PI), -Math.PI) / 2;
    }

    function zoom(mapPx, worldPx, fraction) {
        return Math.floor(Math.log(mapPx / worldPx / fraction) / Math.LN2);
    }

    var ne = bounds.getNorthEast();
    var sw = bounds.getSouthWest();

    var latFraction = (latRad(ne.lat()) - latRad(sw.lat())) / Math.PI;

    var lngDiff = ne.lng() - sw.lng();
    var lngFraction = ((lngDiff < 0) ? (lngDiff + 360) : lngDiff) / 360;

    var latZoom = zoom(mapDim.height, WORLD_DIM.height, latFraction);
    var lngZoom = zoom(mapDim.width, WORLD_DIM.width, lngFraction);

    return Math.min(latZoom, lngZoom, ZOOM_MAX);
}

Demo on jsfiddle

Parameters:

The "bounds" parameter value should be a google.maps.LatLngBounds object.

The "mapDim" parameter value should be an object with "height" and "width" properties that represent the height and width of the DOM element that displays the map. You may want to decrease these values if you want to ensure padding. That is, you may not want map markers within the bounds to be too close to the edge of the map.

If you are using the jQuery library, the mapDim value can be obtained as follows:

var $mapDiv = $('#mapElementId');
var mapDim = { height: $mapDiv.height(), width: $mapDiv.width() };

If you are using the Prototype library, the mapDim value can be obtained as follows:

var mapDim = $('mapElementId').getDimensions();

Return Value:

The return value is the maximum zoom level that will still display the entire bounds. This value will be between 0 and the maximum zoom level, inclusive.

The maximum zoom level is 21. (I believe it was only 19 for Google Maps API v2.)

Explanation:

Google Maps uses a Mercator projection. In a Mercator projection the lines of longitude are equally spaced, but the lines of latitude are not. The distance between lines of latitude increase as they go from the equator to the poles. In fact the distance tends towards infinity as it reaches the poles. A Google Maps map, however, does not show latitudes above approximately 85 degrees North or below approximately -85 degrees South. (reference) (I calculate the actual cutoff at +/-85.05112877980658 degrees.)

This makes the calculation of the fractions for the bounds more complicated for latitude than for longitude. I used a formula from Wikipedia to calculate the latitude fraction. I am assuming this matches the projection used by Google Maps. After all, the Google Maps documentation page I link to above contains a link to the same Wikipedia page.

Other Notes:

Zoom levels range from 0 to the maximum zoom level. Zoom level 0 is the map fully zoomed out. Higher levels zoom the map in further. (reference)
At zoom level 0 the entire world can be displayed in an area that is 256 x 256 pixels. (reference)
For each higher zoom level the number of pixels needed to display the same area doubles in both width and height. (reference)
Maps wrap in the longitudinal direction, but not in the latitudinal direction.

What's the difference between a null pointer and a void pointer?

A Null pointer has the value 0. void pointer is a generic pointer introduced by ANSI. Generic pointer can hold the address of any data type.

How to use jQuery with Angular?

Global Library Installation as Official documentation here

Install from npm:

npm install jquery --save
Add needed script files to scripts:

"scripts": [ "node_modules/jquery/dist/jquery.slim.js" ],

Restart server if you're running it, and it should be working on your app.

If you want to use inside single component use import $ from 'jquery'; inside your component

Spring Boot @Value Properties

Make sure your application.properties file is under src/main/resources/application.properties. Is one way to go. Then add @PostConstruct as follows

Sample Application.properties

file.directory = somePlaceOverHere

Sample Java Class

@ComponentScan
public class PrintProperty {

  @Value("${file.directory}")
  private String fileDirectory;

  @PostConstruct
  public void print() {
    System.out.println(fileDirectory);
  }
}

Code above will print out "somePlaceOverhere"

Creating a BAT file for python script

You can use python code directly in batch file, https://gist.github.com/jadient/9849314.

@echo off & python -x "%~f0" %* & goto :eof
import sys
print("Hello World!")

See explanation, Python command line -x option.

Creating InetAddress object in Java

From the API for InetAddress

The host name can either be a machine name, such as "java.sun.com", or a textual representation of its IP address. If a literal IP address is supplied, only the validity of the address format is checked.

Spring MVC 4: "application/json" Content Type is not being set correctly

As other people have commented, because the return type of your method is String Spring won't feel need to do anything with the result.

If you change your signature so that the return type is something that needs marshalling, that should help:

@RequestMapping(value = "/json", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public Map<String, Object> bar() {
    HashMap<String, Object> map = new HashMap<String, Object>();
    map.put("test", "jsonRestExample");
    return map;
}

Select records from NOW() -1 Day

Sure you can:

SELECT * FROM table
WHERE DateStamp > DATE_ADD(NOW(), INTERVAL -1 DAY)

Combining node.js and Python

I'd consider also Apache Thrift http://thrift.apache.org/

It can bridge between several programming languages, is highly efficient and has support for async or sync calls. See full features here http://thrift.apache.org/docs/features/

The multi language can be useful for future plans, for example if you later want to do part of the computational task in C++ it's very easy to do add it to the mix using Thrift.

How do I find and replace all occurrences (in all files) in Visual Studio Code?

Visual Studio Code: Version: 1.53.2

If you are looking for the answer in 2021 (like I was), the answer is here on the Microsoft website but honestly hard to follow.

Go to Edit > Replace in Files

From there it is similar to the search funtionality for a single file.

I changed the name of a class I was using across files and this worked perfectly.

Note: If you cannot find the Replace in Files option, first click on the Search icon (magnifying glass) and then it will appear.

Using relative URL in CSS file, what location is it relative to?

In order to create modular style sheets that are not dependent on the absolute location of a resource, authors may use relative URIs. Relative URIs (as defined in [RFC3986]) are resolved to full URIs using a base URI. RFC 3986, section 5, defines the normative algorithm for this process. For CSS style sheets, the base URI is that of the style sheet, not that of the source document.

For example, suppose the following rule:
body { background: url("yellow") }
is located in a style sheet designated by the URI:
http://www.example.org/style/basic.css
The background of the source document's BODY will be tiled with whatever image is described by the resource designated by the URI
http://www.example.org/style/yellow
User agents may vary in how they handle invalid URIs or URIs that designate unavailable or inapplicable resources.

Taken from the CSS 2.1 spec.

Sorting arrays in NumPy by column

I had a similar problem.

My Problem:

I want to calculate an SVD and need to sort my eigenvalues in descending order. But I want to keep the mapping between eigenvalues and eigenvectors. My eigenvalues were in the first row and the corresponding eigenvector below it in the same column.

So I want to sort a two-dimensional array column-wise by the first row in descending order.

My Solution

a = a[::, a[0,].argsort()[::-1]]

So how does this work?

a[0,] is just the first row I want to sort by.

Now I use argsort to get the order of indices.

I use [::-1] because I need descending order.

Lastly I use a[::, ...] to get a view with the columns in the right order.

How can I simulate mobile devices and debug in Firefox Browser?

I would use the "Responsive Design View" available under Tools -> Web Developer -> Responsive Design View. It will let you test your CSS against different screen sizes.

Difference between $(window).load() and $(document).ready() functions

$(document).ready happens when all the elements are present in the DOM, but not necessarily all content.

$(document).ready(function() {
    alert("document is ready");
});

window.onload or $(window).load() happens after all the content resources (images, etc) have been loaded.

$(window).load(function() {
    alert("window is loaded");
});

How to fix "Root element is missing." when doing a Visual Studio (VS) Build?

This error can sometimes occur when you edit some Project Toolchain settings Atmel Studio 6.1.2730 SP2.

In my case I tried to edit Project Properties > Toolchain > Linker > General settings with 'All Configurations' selected in the Configuration. When I checked or unchecked a setting, a dialog with the error popped up. However, I found that I could make the same edits if I made them to only one build configuration at a time; i.e. with only 'Debug' or 'Release' selected instead of 'All Configurations'.

Interestingly, I later was able to edit the same Linker settings even with 'All Configurations' selected. I don't know what changed in my project that made this possible.

Regular Expressions- Match Anything

(.*?) matches anything - I've been using it for years.

Hidden Features of Xcode

Get Colin Wheeler's Complete Xcode Keyboard Shortcut List (available as PDF or PNG). Print it and keep it somewhere visible (I've got it on the wall next to my screen).

edit: Updated versions for Xcode 3.2

edit 2: Updated versions for Xcode 4

How to create the most compact mapping n ? isprime(n) up to a limit N?

You could try something like this.

def main():
    try:
        user_in = int(input("Enter a number to determine whether the number is prime or not: "))
    except ValueError:
        print()
        print("You must enter a number!")
        print()
        return
    list_range = list(range(2,user_in+1))
    divisor_list = []
    for number in list_range:
        if user_in%number==0:
            divisor_list.append(number)
    if len(divisor_list) < 2:
        print(user_in, "is a prime number!")
        return
    else:
        print(user_in, "is not a prime number!")
        return
main()

One line if/else condition in linux shell scripting

It's not a direct answer to the question but you could just use the OR-operator

( grep "#SystemMaxUse=" journald.conf > /dev/null && sed -i 's/\#SystemMaxUse=/SystemMaxUse=50M/g' journald.conf ) || echo "This file has been edited. You'll need to do it manually."

Can't find AVD or SDK manager in Eclipse

I would suggest you to install the ADT plugin compatable with your Android SDK tools and try to install all the required plugins compatable with your Android SDK LIKE Android SDK tools Rev 20.0.3 Android SDK tools Rev 20.0.3 Android SDK Platform-tools Rev 14 Android 2.3.3(API 10) sdk platform rev 2 samples for sdk api 10 rev 1 ADT Plugin 20.0.3

Jquery- Get the value of first td in table

In the specific case above, you could do parent/child juggling.

$(this).parents("tr").children("td:first").text()

How to scroll to top of a div using jQuery?

This is my solution to scroll to the top on a button click.

$(".btn").click(function () {
if ($(this).text() == "Show options") {
$(".tabs").animate(
  {
    scrollTop: $(window).scrollTop(0)
  },
  "slow"
 );
 }
});

How can I find the version of php that is running on a distinct domain name?

You can’t. One reason is that not every web site uses PHP. And another reason is: Even if there are some signs that PHP might be used (e.g. .php file name extension, some “PHPSESSID” parameter, X-Powered-By header field containing “PHP”, etc.) those information might be spoofed to let you think PHP is used.

How to find out the username and password for mysql database

Assuming that the user you are using in phpmyadmin has the necessary privileges, you can run this query to change the root password:

UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root';
FLUSH PRIVILEGES;

How to delete an object by id with entity framework

What difference is there between WebClient and HTTPWebRequest classes in .NET?

I know its too longtime to reply but just as an information purpose for future readers:

WebRequest

System.Object
    System.MarshalByRefObject
        System.Net.WebRequest

The WebRequest is an abstract base class. So you actually don't use it directly. You use it through it derived classes - HttpWebRequest and FileWebRequest.

You use Create method of WebRequest to create an instance of WebRequest. GetResponseStream returns data stream.

There are also FileWebRequest and FtpWebRequest classes that inherit from WebRequest. Normally, you would use WebRequest to, well, make a request and convert the return to either HttpWebRequest, FileWebRequest or FtpWebRequest, depend on your request. Below is an example:

Example:

var _request = (HttpWebRequest)WebRequest.Create("http://stackverflow.com");
var _response = (HttpWebResponse)_request.GetResponse();

WebClient

System.Object
        System.MarshalByRefObject
            System.ComponentModel.Component
                System.Net.WebClient

WebClient provides common operations to sending and receiving data from a resource identified by a URI. Simply, it’s a higher-level abstraction of HttpWebRequest. This ‘common operations’ is what differentiate WebClient from HttpWebRequest, as also shown in the sample below:

Example:

var _client = new WebClient();
var _stackContent = _client.DownloadString("http://stackverflow.com");

There are also DownloadData and DownloadFile operations under WebClient instance. These common operations also simplify code of what we would normally do with HttpWebRequest. Using HttpWebRequest, we have to get the response of our request, instantiate StreamReader to read the response and finally, convert the result to whatever type we expect. With WebClient, we just simply call DownloadData, DownloadFile or DownloadString.

However, keep in mind that WebClient.DownloadString doesn’t consider the encoding of the resource you requesting. So, you would probably end up receiving weird characters if you don’t specify and encoding.

NOTE: Basically "WebClient takes few lines of code as compared to Webrequest"

How do I delete multiple rows with different IDs?

Disclaim: the following suggestion could be an overhead depending on the situation. The function is only tested with MSSQL 2008 R2 but seams be compatible to other versions

if you wane do this with many Id's you may could use a function which creates a temp table where you will be able to DELETE FROM the selection

how the query could look like:

-- not tested
-- @ids will contain a varchar with your ids e.g.'9 12 27 37'
DELETE FROM table WHERE id IN (SELECT i.number FROM iter_intlist_to_tbl(@ids))

here is the function:

ALTER FUNCTION iter_intlist_to_tbl (@list nvarchar(MAX))
   RETURNS @tbl TABLE (listpos int IDENTITY(1, 1) NOT NULL,
                       number  int NOT NULL) AS

   -- funktion gefunden auf http://www.sommarskog.se/arrays-in-sql-2005.html
   -- dient zum übergeben einer liste von elementen

BEGIN
    -- Deklaration der Variablen
    DECLARE @startpos int,
            @endpos   int,
            @textpos  int,
            @chunklen smallint,
            @str      nvarchar(4000),
            @tmpstr   nvarchar(4000),
            @leftover nvarchar(4000)

    -- Startwerte festlegen
   SET @textpos = 1
   SET @leftover = ''

   -- Loop 1
    WHILE @textpos <= datalength(@list) / 2
    BEGIN

        --
        SET @chunklen = 4000 - datalength(@leftover) / 2 --datalength() gibt die anzahl der bytes zurück (mit Leerzeichen)

        --
        SET @tmpstr = ltrim(@leftover + substring(@list, @textpos, @chunklen))--SUBSTRING ( @string ,start , length ) | ltrim(@string) abschneiden aller Leerzeichen am Begin des Strings

        --hochzählen der TestPosition
        SET @textpos = @textpos + @chunklen

        --start position 0 setzen
        SET @startpos = 0

        -- end position bekommt den charindex wo ein [LEERZEICHEN] gefunden wird
        SET @endpos = charindex(' ' COLLATE Slovenian_BIN2, @tmpstr)--charindex(searchChar,Wo,Startposition)

        -- Loop 2
        WHILE @endpos > 0
        BEGIN
            --str ist der string welcher zwischen den [LEERZEICHEN] steht
            SET @str = substring(@tmpstr, @startpos + 1, @endpos - @startpos - 1) 

            --wenn @str nicht leer ist wird er zu int Convertiert und @tbl unter der Spalte 'number' hinzugefügt
            IF @str <> ''
                INSERT @tbl (number) VALUES(convert(int, @str))-- convert(Ziel-Type,Value)

            -- start wird auf das letzte bekannte end gesetzt
            SET @startpos = @endpos

            -- end position bekommt den charindex wo ein [LEERZEICHEN] gefunden wird
            SET @endpos = charindex(' ' COLLATE Slovenian_BIN2, @tmpstr, @startpos + 1)
        END
        -- Loop 2

        -- dient dafür den letzten teil des strings zu selektieren
        SET @leftover = right(@tmpstr, datalength(@tmpstr) / 2 - @startpos)--right(@string,anzahl der Zeichen) bsp.: right("abcdef",3) => "def"
    END
    -- Loop 1

    --wenn @leftover nach dem entfernen aller [LEERZEICHEN] nicht leer ist wird er zu int Convertiert und @tbl unter der Spalte 'number' hinzugefügt
    IF ltrim(rtrim(@leftover)) <> ''
        INSERT @tbl (number) VALUES(convert(int, @leftover))

    RETURN
END


    -- ############################ WICHTIG ############################
    -- das is ein Beispiel wie man die Funktion benutzt
    --
    --CREATE    PROCEDURE get_product_names_iter 
    --      @ids varchar(50) AS
    --SELECT    P.ProductName, P.ProductID
    --FROM      Northwind.Products P
    --JOIN      iter_intlist_to_tbl(@ids) i ON P.ProductID = i.number
    --go
    --EXEC get_product_names_iter '9 12 27 37'
    --
    -- Funktion gefunden auf http://www.sommarskog.se/arrays-in-sql-2005.html
    -- dient zum übergeben einer Liste von Id's
    -- ############################ WICHTIG ############################

PHP Converting Integer to Date, reverse of strtotime

Can you try this,

echo date("Y-m-d H:i:s", 1388516401);

As noted by theGame,

This means that you pass in a string value for the time, and optionally a value for the current time, which is a UNIX timestamp. The value that is returned is an integer which is a UNIX timestamp.

echo strtotime("2014-01-01 00:00:01");

This will return into the value 1388516401, which is the UNIX timestamp for the date 2014-01-01. This can be confirmed using the date() function as like below:

echo date('Y-m-d', 1198148400); // echos 2014-01-01

How to check if an element exists in the xml using xpath?

The Saxon documentation, though a little unclear, seems to suggest that the JAXP XPath API will return false when evaluating an XPath expression if no matching nodes are found.

This IBM article mentions a return value of null when no nodes are matched.

You might need to play around with the return types a bit based on this API, but the basic idea is that you just run a normal XPath and check whether the result is a node / false / null / etc.

XPathFactory xpathFactory = XPathFactory.newInstance(NamespaceConstant.OBJECT_MODEL_SAXON);
XPath xpath = xpathFactory.newXPath();
XPathExpression expr = xpath.compile("/Consumers/Consumer/DataSources/Credit/CreditReport/AttachedXml");
Object result = expr.evaluate(doc, XPathConstants.NODE);

if ( result == null ) {
    // do something
}

How do I enumerate through a JObject?

If you look at the documentation for JObject, you will see that it implements IEnumerable<KeyValuePair<string, JToken>>. So, you can iterate over it simply using a foreach:

foreach (var x in obj)
{
    string name = x.Key;
    JToken value = x.Value;
    …
}

How to check if array element is null to avoid NullPointerException in Java

The given code works for me. Notice that someArray[i] is always null since you have not initialized the second dimension of the array.

How to send json data in the Http request using NSURLRequest

Since my edit to Mike G's answer to modernize the code was rejected 3 to 2 as

This edit was intended to address the author of the post and makes no sense as an edit. It should have been written as a comment or an answer

I'm reposting my edit as a separate answer here. This edit removes the JSONRepresentation dependency with NSJSONSerialization as Rob's comment with 15 upvotes suggests.

    NSArray *objects = [NSArray arrayWithObjects:[[NSUserDefaults standardUserDefaults]valueForKey:@"StoreNickName"],
      [[UIDevice currentDevice] uniqueIdentifier], [dict objectForKey:@"user_question"],     nil];
    NSArray *keys = [NSArray arrayWithObjects:@"nick_name", @"UDID", @"user_question", nil];
    NSDictionary *questionDict = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

    NSDictionary *jsonDict = [NSDictionary dictionaryWithObject:questionDict forKey:@"question"];

    NSLog(@"jsonRequest is %@", jsonRequest);

    NSURL *url = [NSURL URLWithString:@"https://xxxxxxx.com/questions"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                 cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];


    NSData *requestData = [NSJSONSerialization dataWithJSONObject:dict options:0 error:nil]; //TODO handle error

    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody: requestData];

    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    if (connection) {
     receivedData = [[NSMutableData data] retain];
    }

The receivedData is then handled by:

NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSDictionary *question = [jsonDict objectForKey:@"question"];

how to delete the content of text file without deleting itself

Just print an empty string into the file:

PrintWriter writer = new PrintWriter(file);
writer.print("");
writer.close();

How to store and retrieve a dictionary with redis

The redis SET command stores a string, not arbitrary data. You could try using the redis HSET command to store the dict as a redis hash with something like

for k,v in my_dict.iteritems():
    r.hset('my_dict', k, v)

but the redis datatypes and python datatypes don't quite line up. Python dicts can be arbitrarily nested, but a redis hash is going to require that your value is a string. Another approach you can take is to convert your python data to string and store that in redis, something like

r.set('this_dict', str(my_dict))

and then when you get the string out you will need to parse it to recreate the python object.

Pass multiple optional parameters to a C# function

Use a parameter array with the params modifier:

public static int AddUp(params int[] values)
{
    int sum = 0;
    foreach (int value in values)
    {
        sum += value;
    }
    return sum;
}

If you want to make sure there's at least one value (rather than a possibly empty array) then specify that separately:

public static int AddUp(int firstValue, params int[] values)

(Set sum to firstValue to start with in the implementation.)

Note that you should also check the array reference for nullity in the normal way. Within the method, the parameter is a perfectly ordinary array. The parameter array modifier only makes a difference when you call the method. Basically the compiler turns:

int x = AddUp(4, 5, 6);

into something like:

int[] tmp = new int[] { 4, 5, 6 };
int x = AddUp(tmp);

You can call it with a perfectly normal array though - so the latter syntax is valid in source code as well.

How can javascript upload a blob?

Try this

var fd = new FormData();
fd.append('fname', 'test.wav');
fd.append('data', soundBlob);
$.ajax({
    type: 'POST',
    url: '/upload.php',
    data: fd,
    processData: false,
    contentType: false
}).done(function(data) {
       console.log(data);
});

You need to use the FormData API and set the jQuery.ajax's processData and contentType to false.

Error: the entity type requires a primary key

Make sure you have the following condition:

Use [key] if your primary key name is not Id or ID.
Use the public keyword.
Primary key should have getter and setter.

Example:

public class MyEntity {
   [key]
   public Guid Id {get; set;}
}

Set the maximum character length of a UITextField in Swift

This answer is for Swift 4, and is pretty straight forward with the ability to let backspace through.

func textField(_ textField: UITextField, 
               shouldChangeCharactersIn range: NSRange, 
               replacementString string: String) -> Bool {
    return textField.text!.count < 10 || string == ""
}

Get the cartesian product of a series of lists?

I would use list comprehension :

somelists = [
   [1, 2, 3],
   ['a', 'b'],
   [4, 5]
]

cart_prod = [(a,b,c) for a in somelists[0] for b in somelists[1] for c in somelists[2]]

How can I change text color via keyboard shortcut in MS word 2010

Press Alt+H(h) and then you'll see the shortcuts on the toolbar, press FC to operate color menu and press A(Automatic) for black or browse through other colors using arrow keys.

Allowing Java to use an untrusted certificate for SSL/HTTPS connection

Another option is to get a ".pem" (public key) file for that particular server, and install it locally into the heart of your JRE's "cacerts" file (use the keytool helper application), then it will be able to download from that server without complaint, without compromising the entire SSL structure of your running JVM and enabling download from other unknown cert servers...

Warning: push.default is unset; its implicit value is changing in Git 2.0

It's explained in great detail in the docs, but I'll try to summarize:

matching means git push will push all your local branches to the ones with the same name on the remote. This makes it easy to accidentally push a branch you didn't intend to.
simple means git push will push only the current branch to the one that git pull would pull from, and also checks that their names match. This is a more intuitive behavior, which is why the default is getting changed to this.

This setting only affects the behavior of your local client, and can be overridden by explicitly specifying which branches you want to push on the command line. Other clients can have different settings, it only affects what happens when you don't specify which branches you want to push.

Why can't I see the "Report Data" window when creating reports?

After I accidentally closed this window, I took an hour to find how to bring it back up.

The right answer is indeed: View-->Report Data (ctrl+alt+D)

The tricky part: the 'Report Data' entry does not always appear in the 'View' dropdown. Make sure that you have a report open, and some element of the report selected.

If you're not 'in the report', the entry disappears from the menu.

Java HttpRequest JSON & Response Handling

The simplest way is using libraries like google-http-java-client but if you want parse the JSON response by yourself you can do that in a multiple ways, you can use org.json, json-simple, Gson, minimal-json, jackson-mapper-asl (from 1.x)... etc

A set of simple examples:

Using Gson:

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class Gson {

    public static void main(String[] args) {
    }

    public HttpResponse http(String url, String body) {

        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            HttpPost request = new HttpPost(url);
            StringEntity params = new StringEntity(body);
            request.addHeader("content-type", "application/json");
            request.setEntity(params);
            HttpResponse result = httpClient.execute(request);
            String json = EntityUtils.toString(result.getEntity(), "UTF-8");

            com.google.gson.Gson gson = new com.google.gson.Gson();
            Response respuesta = gson.fromJson(json, Response.class);

            System.out.println(respuesta.getExample());
            System.out.println(respuesta.getFr());

        } catch (IOException ex) {
        }
        return null;
    }

    public class Response{

        private String example;
        private String fr;

        public String getExample() {
            return example;
        }
        public void setExample(String example) {
            this.example = example;
        }
        public String getFr() {
            return fr;
        }
        public void setFr(String fr) {
            this.fr = fr;
        }
    }
}

Using json-simple:

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class JsonSimple {

    public static void main(String[] args) {

    }

    public HttpResponse http(String url, String body) {

        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            HttpPost request = new HttpPost(url);
            StringEntity params = new StringEntity(body);
            request.addHeader("content-type", "application/json");
            request.setEntity(params);
            HttpResponse result = httpClient.execute(request);

            String json = EntityUtils.toString(result.getEntity(), "UTF-8");
            try {
                JSONParser parser = new JSONParser();
                Object resultObject = parser.parse(json);

                if (resultObject instanceof JSONArray) {
                    JSONArray array=(JSONArray)resultObject;
                    for (Object object : array) {
                        JSONObject obj =(JSONObject)object;
                        System.out.println(obj.get("example"));
                        System.out.println(obj.get("fr"));
                    }

                }else if (resultObject instanceof JSONObject) {
                    JSONObject obj =(JSONObject)resultObject;
                    System.out.println(obj.get("example"));
                    System.out.println(obj.get("fr"));
                }

            } catch (Exception e) {
                // TODO: handle exception
            }

        } catch (IOException ex) {
        }
        return null;
    }
}

etc...

How do I check if an HTML element is empty using jQuery?

!elt.hasChildNodes()

Yes, I know, this is not jQuery, so you could use this:

!$(elt)[0].hasChildNodes()

Happy now?

Should I put input elements inside a label element?

I usually go with the first two options. I've seen a scenario when the third option was used, when radio choices where embedded in labels and the css contained something like

label input {
    vertical-align: bottom;
}

in order to ensure proper vertical alignment for the radios.

How are zlib, gzip and zip related? What do they have in common and how are they different?

ZIP is a file format used for storing an arbitrary number of files and folders together with lossless compression. It makes no strict assumptions about the compression methods used, but is most frequently used with DEFLATE.

Gzip is both a compression algorithm based on DEFLATE but less encumbered with potential patents et al, and a file format for storing a single compressed file. It supports compressing an arbitrary number of files and folders when combined with tar. The resulting file has an extension of .tgz or .tar.gz and is commonly called a tarball.

zlib is a library of functions encapsulating DEFLATE in its most common LZ77 incarnation.

How do I create a pause/wait function using Qt?

we can use following method QT_Delay:

QTimer::singleShot(2000,this,SLOT(print_lcd()));

This will wait for 2 seconds before calling print_lcd().

How to delete stuff printed to console by System.out.println()?

The easiest ways to do this would be:

System.out.println("\f");

System.out.println("\u000c");

Calculate last day of month in JavaScript

var month = 0; // January
var d = new Date(2008, month + 1, 0);
alert(d); // last day in January

IE 6:                     Thu Jan 31 00:00:00 CST 2008
IE 7:                     Thu Jan 31 00:00:00 CST 2008
IE 8: Beta 2:             Thu Jan 31 00:00:00 CST 2008
Opera 8.54:               Thu, 31 Jan 2008 00:00:00 GMT-0600
Opera 9.27:               Thu, 31 Jan 2008 00:00:00 GMT-0600
Opera 9.60:               Thu Jan 31 2008 00:00:00 GMT-0600
Firefox 2.0.0.17:         Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Firefox 3.0.3:            Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Google Chrome 0.2.149.30: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Safari for Windows 3.1.2: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)

Output differences are due to differences in the toString() implementation, not because the dates are different.

Of course, just because the browsers identified above use 0 as the last day of the previous month does not mean they will continue to do so, or that browsers not listed will do so, but it lends credibility to the belief that it should work the same way in every browser.

How I can get and use the header file <graphics.h> in my C++ program?

<graphics.h> is very old library. It's better to use something that is new

Here are some 2D libraries (platform independent) for C/C++

SDL

GTK+

Also there is a free very powerful 3D open source graphics library for C++

OGRE

Error in MySQL when setting default value for DATE or DATETIME

First select current session sql_mode:

SELECT @@SESSION.sql_mode;

Then you will get something like that default value:

'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'

and then set sql_mode without 'NO_ZERO_DATE':

SET SESSION sql_mode = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

If you have grants, you can do it also for GLOBAL:

SELECT @@GLOBAL.sql_mode;
SET GLOBAL sql_mode = '...';

How to update primary key

You could use this recursive function for generate necessary T-SQL script.

CREATE FUNCTION dbo.Update_Delete_PrimaryKey
(
    @TableName      NVARCHAR(255),
    @ColumnName     NVARCHAR(255),
    @OldValue       NVARCHAR(MAX),
    @NewValue       NVARCHAR(MAX),
    @Del            BIT
)
RETURNS NVARCHAR 
(
    MAX
)
AS
BEGIN
    DECLARE @fks TABLE 
            (
                constraint_name NVARCHAR(255),
                table_name NVARCHAR(255),
                col NVARCHAR(255)
            );
    DECLARE @Sql                  NVARCHAR(MAX),
            @EnableConstraints     NVARCHAR(MAX);

    SET @Sql = '';
    SET @EnableConstraints = '';

    INSERT INTO @fks
      (
        constraint_name,
        table_name,
        col
      )
    SELECT oConstraint.name     constraint_name,
           oParent.name         table_name,
           oParentCol.name      col
    FROM   sys.foreign_key_columns sfkc
           --INNER JOIN sys.foreign_keys sfk
           --     ON  sfk.[object_id] = sfkc.constraint_object_id

           INNER JOIN sys.sysobjects oConstraint
                ON  sfkc.constraint_object_id = oConstraint.id
           INNER JOIN sys.sysobjects oParent
                ON  sfkc.parent_object_id = oParent.id
           INNER JOIN sys.all_columns oParentCol
                ON  sfkc.parent_object_id = oParentCol.object_id
                AND sfkc.parent_column_id = oParentCol.column_id
           INNER JOIN sys.sysobjects oReference
                ON  sfkc.referenced_object_id = oReference.id
           INNER JOIN sys.all_columns oReferenceCol
                ON  sfkc.referenced_object_id = oReferenceCol.object_id
                AND sfkc.referenced_column_id = oReferenceCol.column_id
    WHERE  oReference.name = @TableName
           AND oReferenceCol.name = @ColumnName
    --AND (@Del <> 1 OR sfk.delete_referential_action = 0)
    --AND (@Del = 1 OR sfk.update_referential_action = 0)

    IF EXISTS(
           SELECT 1
           FROM   @fks
       )
    BEGIN
        DECLARE @Constraint     NVARCHAR(255),
                @Table          NVARCHAR(255),
                @Col            NVARCHAR(255)  

        DECLARE Table_Cursor CURSOR LOCAL 
        FOR
            SELECT f.constraint_name,
                   f.table_name,
                   f.col
            FROM   @fks AS f

        OPEN Table_Cursor FETCH NEXT FROM Table_Cursor INTO @Constraint, @Table,@Col  
        WHILE (@@FETCH_STATUS = 0)
        BEGIN
            IF @Del <> 1
            BEGIN
                SET @Sql = @Sql + 'ALTER TABLE ' + @Table + ' NOCHECK CONSTRAINT ' + @Constraint + CHAR(13) + CHAR(10);
                SET @EnableConstraints = @EnableConstraints + 'ALTER TABLE ' + @Table + ' CHECK CONSTRAINT ' + @Constraint 
                    + CHAR(13) + CHAR(10);
            END

            SET @Sql = @Sql + dbo.Update_Delete_PrimaryKey(@Table, @Col, @OldValue, @NewValue, @Del);
            FETCH NEXT FROM Table_Cursor INTO @Constraint, @Table,@Col
        END

        CLOSE Table_Cursor DEALLOCATE Table_Cursor
    END

    DECLARE @DataType NVARCHAR(30);
    SELECT @DataType = t.name +
           CASE 
                WHEN t.name IN ('char', 'varchar', 'nchar', 'nvarchar') THEN '(' +
                     CASE 
                          WHEN c.max_length = -1 THEN 'MAX'
                          ELSE CONVERT(
                                   VARCHAR(4),
                                   CASE 
                                        WHEN t.name IN ('nchar', 'nvarchar') THEN c.max_length / 2
                                        ELSE c.max_length
                                   END
                               )
                     END + ')'
                WHEN t.name IN ('decimal', 'numeric') THEN '(' + CONVERT(VARCHAR(4), c.precision) + ',' 
                     + CONVERT(VARCHAR(4), c.Scale) + ')'
                ELSE ''
           END
    FROM   sys.columns c
           INNER JOIN sys.types t
                ON  c.user_type_id = t.user_type_id
    WHERE  c.object_id = OBJECT_ID(@TableName)
           AND c.name = @ColumnName

    IF @Del <> 1
    BEGIN
        SET @Sql = @Sql + 'UPDATE [' + @TableName + '] SET [' + @ColumnName + '] = CONVERT(' + @DataType + ', ' + ISNULL('N''' + @NewValue + '''', 'NULL') 
            + ') WHERE [' + @ColumnName + '] = CONVERT(' + @DataType + ', ' + ISNULL('N''' + @OldValue + '''', 'NULL') +
            ');' + CHAR(13) + CHAR(10);
        SET @Sql = @Sql + @EnableConstraints;
    END
    ELSE
        SET @Sql = @Sql + 'DELETE [' + @TableName + '] WHERE [' + @ColumnName + '] = CONVERT(' + @DataType + ', N''' + @OldValue 
            + ''');' + CHAR(13) + CHAR(10);
    RETURN @Sql;
END
GO

DECLARE @Result NVARCHAR(MAX);
SET @Result = dbo.Update_Delete_PrimaryKey('@TableName', '@ColumnName', '@OldValue', '@NewValue', 0);/*Update*/
EXEC (@Result)
SET @Result = dbo.Update_Delete_PrimaryKey('@TableName', '@ColumnName', '@OldValue', NULL, 1);/*Delete*/
EXEC (@Result)
GO

DROP FUNCTION Update_Delete_PrimaryKey;

runOnUiThread in fragment

For Kotlin on fragment just do this

activity?.runOnUiThread(Runnable {
        //on main thread
    })

How to increase font size in NeatBeans IDE?

Go to Tools|options|keymap. Search for 'zoom in text' and set your preferred key. I've set alt+plus and alt+minus.

how to open popup window using jsp or jquery?

<a href="javaScript:{openPopUp();}"></a>
<form action="actionName">
<div id="divId" style="display:none;">
UsreName:<input type="text" name="userName"/>
</div>
</form>

function openPopUp()
{
  $('#divId').css('display','block');
$('#divId').dialog();
}

What does .class mean in Java?

This <?> is a beast. It often leads to confusion and errors, because, when you see it first, then you start believing, <?> is a wildcard for any java type. Which is .. not true. <?> is the unknown type, a slight and nasty difference.

It's not a problem when you use it with Class. Both lines work and compile:

Class anyType = String.class;
Class <?> theUnknownType = String.class;

But - if we start using it with collections, then we see strange compiletime errors:

List<?> list = new ArrayList<Object>();  // ArrayList<?> is not allowed
list.add("a String");                    // doesn't compile ...

Our List<?> is not a collection, that is suitable for just any type of object. It can only store one type: the mystic "unkown type". Which is not a real type, for sure.

How to use the pass statement?

Pass refers to ignore....as simple as it is ....if the given condition is true and the next statement is pass it ignores that value or iteration and proceed to the next line ..... Example

For i in range (1,100):
    If i%2==0:
                  Pass 
    Else:
                  Print(i)

Output: Prints all the odd numbers from 1-100

This is because modulus of even number is equal to zero ,hence it ignores the number and proceeds to next number ,since odd numbers modulus is not equal to zero the Else part of the loop is executed and its printed

How can I ping a server port with PHP?

socket_create needs to be run as root on a UNIX system with;

$socket = socket_create(AF_UNIX, SOCK_STREAM, 0);

Understanding PIVOT function in T-SQL

FOR XML PATH might not work on Microsoft Azure Synapse Serve. A possible alternative, following @Taryn dynamic generated cols approach, same results is obtained by using STRING_AGG.

DECLARE @cols AS NVARCHAR(MAX), @query AS NVARCHAR(MAX)

SELECT @cols = STRING_AGG(QUOTENAME(c.phaseid),', ')
/*OPTIONAL: within group (order by cast(t1.[FLOW_SP_SLPM] as INT) asc)*/
FROM (SELECT phaseid FROM temp
GROUP BY phaseid) c

set @query = 'SELECT elementid,' + @cols + ' from 
             (
                select elementid,
                phaseid,
                effort
                from temp
            ) x
            PIVOT 
            (
                max(effort)
                for phaseid in (' + @cols + ')
            ) p '

execute(@query)

What is the cleanest way to ssh and run multiple commands in Bash?

This can also be done as follows. Put your commands in a script, let's name it commands-inc.sh

#!/bin/bash
ls some_folder
./someaction.sh
pwd

Save the file

Now run it on the remote server.

ssh user@remote 'bash -s' < /path/to/commands-inc.sh

Never failed for me.

How do I get multiple subplots in matplotlib?

You might be interested in the fact that as of matplotlib version 2.1 the second code from the question works fine as well.

From the change log:

Figure class now has subplots method The Figure class now has a subplots() method which behaves the same as pyplot.subplots() but on an existing figure.

Example:

import matplotlib.pyplot as plt

fig = plt.figure()
axes = fig.subplots(nrows=2, ncols=2)

plt.show()

if, elif, else statement issues in Bash

You have some syntax issues with your script. Here is a fixed version:

#!/bin/bash

if [ "$seconds" -eq 0 ]; then
   timezone_string="Z"
elif [ "$seconds" -gt 0 ]; then
   timezone_string=$(printf "%02d:%02d" $((seconds/3600)) $(((seconds / 60) % 60)))
else
   echo "Unknown parameter"
fi

ssh: check if a tunnel is alive

If you are using ssh in background, use this:

sudo lsof -i -n | egrep '\<ssh\>'

How to check if a file is a valid image file?

In addition to what Brian is suggesting you could use PIL's verify method to check if the file is broken.

im.verify()

Attempts to determine if the file is broken, without actually decoding the image data. If this method finds any problems, it raises suitable exceptions. This method only works on a newly opened image; if the image has already been loaded, the result is undefined. Also, if you need to load the image after using this method, you must reopen the image file. Attributes

What is polymorphism, what is it for, and how is it used?

Polymorphism is the ability of the programmer to write methods of the same name that do different things for different types of objects, depending on the needs of those objects. For example, if you were developing a class called Fraction and a class called ComplexNumber, both of these might include a method called display(), but each of them would implement that method differently. In PHP, for example, you might implement it like this:

//  Class definitions

class Fraction
{
    public $numerator;
    public $denominator;

    public function __construct($n, $d)
    {
        //  In real life, you'd do some type checking, making sure $d != 0, etc.
        $this->numerator = $n;
        $this->denominator = $d;
    }

    public function display()
    {
        echo $this->numerator . '/' . $this->denominator;
    }
}

class ComplexNumber
{
    public $real;
    public $imaginary;

    public function __construct($a, $b)
    {
        $this->real = $a;
        $this->imaginary = $b;
    }

    public function display()
    {
        echo $this->real . '+' . $this->imaginary . 'i';
    }
}


//  Main program

$fraction = new Fraction(1, 2);
$complex = new ComplexNumber(1, 2);

echo 'This is a fraction: '
$fraction->display();
echo "\n";

echo 'This is a complex number: '
$complex->display();
echo "\n";

Outputs:

This is a fraction: 1/2
This is a complex number: 1 + 2i

Some of the other answers seem to imply that polymorphism is used only in conjunction with inheritance; for example, maybe Fraction and ComplexNumber both implement an abstract class called Number that has a method display(), which Fraction and ComplexNumber are then both obligated to implement. But you don't need inheritance to take advantage of polymorphism.

At least in dynamically-typed languages like PHP (I don't know about C++ or Java), polymorphism allows the developer to call a method without necessarily knowing the type of object ahead of time, and trusting that the correct implementation of the method will be called. For example, say the user chooses the type of Number created:

$userNumberChoice = $_GET['userNumberChoice'];

switch ($userNumberChoice) {
    case 'fraction':
        $userNumber = new Fraction(1, 2);
        break;
    case 'complex':
        $userNumber = new ComplexNumber(1, 2);
        break;
}

echo "The user's number is: ";
$userNumber->display();
echo "\n";

In this case, the appropriate display() method will be called, even though the developer can't know ahead of time whether the user will choose a fraction or a complex number.

Filter dict to contain only certain keys?

Based on the accepted answer by delnan.

What if one of your wanted keys aren't in the old_dict? The delnan solution will throw a KeyError exception that you can catch. If that's not what you need maybe you want to:

only include keys that excists both in the old_dict and your set of wanted_keys.

old_dict = {'name':"Foobar", 'baz':42}
wanted_keys = ['name', 'age']
new_dict = {k: old_dict[k] for k in set(wanted_keys) & set(old_dict.keys())}

>>> new_dict
{'name': 'Foobar'}

have a default value for keys that's not set in old_dict.

default = None
new_dict = {k: old_dict[k] if k in old_dict else default for k in wanted_keys}

>>> new_dict
{'age': None, 'name': 'Foobar'}

How to remove the hash from window.location (URL) with JavaScript without page refresh?

This will remove the trailing hash as well. eg: http://test.com/123#abc -> http://test.com/123

if(window.history.pushState) {
    window.history.pushState('', '/', window.location.pathname)
} else {
    window.location.hash = '';
}

How to create a oracle sql script spool file

In order to execute a spool file in plsql Go to File->New->command window -> paste your code-> execute. Got to the directory and u will find the file.

How to use Microsoft.Office.Interop.Excel on a machine without installed MS Office?

Look for GSpread.NET. You can work with Google Spreadsheets by using API from Microsoft Excel. You don't need to rewrite old code with the new Google API usage. Just add a few row:

Set objExcel = CreateObject("GSpreadCOM.Application");

app.MailLogon(Name, ClientIdAndSecret, ScriptId);

It's an OpenSource project and it doesn't require Office to be installed.

The documentation available over here http://scand.com/products/gspread/index.html

Selecting and manipulating CSS pseudo-elements such as ::before and ::after using javascript (or jQuery)

This is not practical as i did not write this for real world uses, just to give you a example of what can be achieved.

css = {
before: function(elem,attr){ 

if($("#cust_style") !== undefined){ 
$("body").append("<style> " + elem + ":before {"  + attr +  "} </style>"); 
} else {
 $("#cust_style").remove();
$("body").append("<style> " + elem + ":before {"  + attr +  "} </style>"); 
}

}, after: function(elem,attr){
if($("#cust_style") !== undefined){ 
$("body").append("<style> " + elem + ":after {"  + attr +  "} </style>"); 

} else { $("#cust_style").remove();
$("body").append("<style> " + elem + ":after {"  + attr +  "} </style>"); 
}
}
}

this currently add's a / or appends a Style element which contains your necessary attribute's which will take affect on the target element's after Pseudo element.

this can be used as

css.after("someElement"," content: 'Test'; position: 'absolute'; ") // editing / adding styles to :after

and

css.before( ... ); // to affect the before pseudo element.

as after: and before: pseudo elements are not directly accessible through DOM it is currently not possible to edit the Specific values of the css freely.

my way was just a example and its not good for practice, you can modify it try some of your own tricks and make it correct for real world usage.

so do your own experimentation's with this and others!

regards - Adarsh Hegde.

What is JavaScript's highest integer value that a number can go to without losing precision?

Scato wrotes:

anything you want to use for bitwise operations must be between 0x80000000 (-2147483648 or -2^31) and 0x7fffffff (2147483647 or 2^31 - 1).

the console will tell you that 0x80000000 equals +2147483648, but 0x80000000 & 0x80000000 equals -2147483648

Hex-Decimals are unsigned positive values, so 0x80000000 = 2147483648 - thats mathematically correct. If you want to make it a signed value you have to right shift: 0x80000000 >> 0 = -2147483648. You can write 1 << 31 instead, too.

Why does Git treat this text file as a binary file?

We had this case where an .html file was seen as binary whenever we tried to make changes in it. Very uncool to not see diffs. To be honest, I didn't checked all the solutions here but what worked for us was the following:

Removed the file (actually moved it to my Desktop) and commited the git deletion. Git says Deleted file with mode 100644 (Regular) Binary file differs
Re-added the file (actually moved it from my Desktop back into the project). Git says New file with mode 100644 (Regular) 1 chunk, 135 insertions, 0 deletions The file is now added as a regular text file

From now on, any changes I made in the file is seen as a regular text diff. You could also squash these commits (1, 2, and 3 being the actual change you make) but I prefer to be able to see in the future what I did. Squashing 1 & 2 will show a binary change.

how to get the selected index of a drop down

<select name="CCards" id="ccards">
    <option value="0">Select Saved Payment Method:</option>
    <option value="1846">test  xxxx1234</option>
    <option value="1962">test2  xxxx3456</option>
</select>

<script type="text/javascript">

    /** Jquery **/
    var selectedValue = $('#ccards').val();

    //** Regular Javascript **/
    var selectedValue2 = document.getElementById('ccards').value;


</script>

Retrieve all values from HashMap keys in an ArrayList Java

Suppose I have Hashmap with key datatype as KeyDataType and value datatype as ValueDataType

HashMap<KeyDataType,ValueDataType> list;

Add all items you needed to it. Now you can retrive all hashmap keys to a list by.

KeyDataType[] mKeys;
mKeys=list.keySet().toArray(new KeyDataType[list.size()]);

So, now you got your all keys in an array mkeys[]

you can now retrieve any value by calling

 list.get(mkeys[position]);

Echo a blank (empty) line to the console from a Windows batch file

There is often the tip to use 'echo.'

But that is slow, and it could fail with an error message, as cmd.exe will search first for a file named 'echo' (without extension) and only when the file doesn't exists it outputs an empty line.

You could use echo(. This is approximately 20 times faster, and it works always. The only drawback could be that it looks odd.

More about the different ECHO:/\ variants is at DOS tips: ECHO. FAILS to give text or blank line.

BeautifulSoup getting href

You can use find_all in the following way to find every a element that has an href attribute, and print each one:

from BeautifulSoup import BeautifulSoup

html = '''<a href="some_url">next</a>
<span class="class"><a href="another_url">later</a></span>'''

soup = BeautifulSoup(html)

for a in soup.find_all('a', href=True):
    print "Found the URL:", a['href']

The output would be:

Found the URL: some_url
Found the URL: another_url

Note that if you're using an older version of BeautifulSoup (before version 4) the name of this method is findAll. In version 4, BeautifulSoup's method names were changed to be PEP 8 compliant, so you should use find_all instead.

If you want all tags with an href, you can omit the name parameter:

href_tags = soup.find_all(href=True)

How to use mongoimport to import csv

Strangely no one mentioned --uri flag:

mongoimport --uri connectionString -c questions --type csv --file questions.csv --headerline

How to use jQuery in AngularJS

The best option is create a directive and wrap the slider features there. The secret is use $timeout, the jquery code will be called only when DOM is ready.

angular.module('app')
.directive('my-slider', 
    ['$timeout', function($timeout) {
        return {
            restrict:'E',
            scope: true,
            template: '<div id="{{ id }}"></div>',
            link: function($scope) {
                $scope.id = String(Math.random()).substr(2, 8);

                $timeout(function() {
                    angular.element('#'+$scope.id).slider();                    
                });
            }
        };
    }]
);

How can I share Jupyter notebooks with non-programmers?

A great way of doing this on WordPress consists of the following steps:

Step 1: Open your Jupyter notebook in a text editor and copy the content which may look like so: Your .ipynb file may look like this when opened in a text editor

Step 2: Ctrl + A and Ctrl + C this content. Then Ctrl + V this to a GitHub Gist that you should create.

Step 3: Create a public gist and embed the gist like you always embed gists on WordPress, viz., go to the HTML editor and add like so:

[gist gist_url]

I have actually implemented this on my blog. You can find the post here

Entity Framework - "An error occurred while updating the entries. See the inner exception for details"

It could be caused by a data conversion from .NET to SQL, for instance a datetime conversion error. For me it was a null reference to a datetime column.

Also, that is not an exact error message. You can see the exact error in watch at exception.InnerException.InnerException -> ResultView.

Routing for custom ASP.NET MVC 404 Error page

This solution doesn't need web.config file changes or catch-all routes.

First, create a controller like this;

public class ErrorController : Controller
{
    public ActionResult Index()
    {
        ViewBag.Title = "Regular Error";
        return View();
    }

    public ActionResult NotFound404()
    {
        ViewBag.Title = "Error 404 - File not Found";
        return View("Index");
    }
}

Then create the view under "Views/Error/Index.cshtml" as;

 @{
      Layout = "~/Views/Shared/_Layout.cshtml";
  }                     
  <p>We're sorry, page you're looking for is, sadly, not here.</p>

Then add the following in the Global asax file as below:

protected void Application_Error(object sender, EventArgs e)
{
        // Do whatever you want to do with the error

        //Show the custom error page...
        Server.ClearError(); 
        var routeData = new RouteData();
        routeData.Values["controller"] = "Error";

        if ((Context.Server.GetLastError() is HttpException) && ((Context.Server.GetLastError() as HttpException).GetHttpCode() != 404))
        {
            routeData.Values["action"] = "Index";
        }
        else
        {
            // Handle 404 error and response code
            Response.StatusCode = 404;
            routeData.Values["action"] = "NotFound404";
        } 
        Response.TrySkipIisCustomErrors = true; // If you are using IIS7, have this line
        IController errorsController = new ErrorController();
        HttpContextWrapper wrapper = new HttpContextWrapper(Context);
        var rc = new System.Web.Routing.RequestContext(wrapper, routeData);
        errorsController.Execute(rc);

        Response.End();
}

If you still get the custom IIS error page after doing this, make sure the following sections are commented out(or empty) in the web config file:

<system.web>
   <customErrors mode="Off" />
</system.web>
<system.webServer>   
   <httpErrors>     
   </httpErrors>
</system.webServer>

Inserting multiple rows in a single SQL query?

If you are inserting into a single table, you can write your query like this (maybe only in MySQL):

INSERT INTO table1 (First, Last)
VALUES
    ('Fred', 'Smith'),
    ('John', 'Smith'),
    ('Michael', 'Smith'),
    ('Robert', 'Smith');

Why use Gradle instead of Ant or Maven?

Gradle put the fun back into building/assembling software. I used ant to build software my entire career and I have always considered the actual "buildit" part of the dev work being a necessary evil. A few months back our company grew tired of not using a binary repo (aka checking in jars into the vcs) and I was given the task to investigate this. Started with ivy since it could be bolted on top of ant, didn't have much luck getting my built artifacts published like I wanted. I went for maven and hacked away with xml, worked splendid for some simple helper libs but I ran into serious problems trying to bundle applications ready for deploy. Hassled quite a while googling plugins and reading forums and wound up downloading trillions of support jars for various plugins which I had a hard time using. Finally I went for gradle (getting quite bitter at this point, and annoyed that "It shouldn't be THIS hard!")

But from day one my mood started to improve. I was getting somewhere. Took me like two hours to migrate my first ant module and the build file was basically nothing. Easily fitted one screen. The big "wow" was: build scripts in xml, how stupid is that? the fact that declaring one dependency takes ONE row is very appealing to me -> you can easily see all dependencies for a certain project on one page. From then on I been on a constant roll, for every problem I faced so far there is a simple and elegant solution. I think these are the reasons:

groovy is very intuitive for java developers
documentation is great to awesome
the flexibility is endless

Now I spend my days trying to think up new features to add to our build process. How sick is that?

Matplotlib discrete colorbar

I have been investigating these ideas and here is my five cents worth. It avoids calling BoundaryNorm as well as specifying norm as an argument to scatter and colorbar. However I have found no way of eliminating the rather long-winded call to matplotlib.colors.LinearSegmentedColormap.from_list.

Some background is that matplotlib provides so-called qualitative colormaps, intended to use with discrete data. Set1, e.g., has 9 easily distinguishable colors, and tab20 could be used for 20 colors. With these maps it could be natural to use their first n colors to color scatter plots with n categories, as the following example does. The example also produces a colorbar with n discrete colors approprately labelled.

import matplotlib, numpy as np, matplotlib.pyplot as plt
n = 5
from_list = matplotlib.colors.LinearSegmentedColormap.from_list
cm = from_list(None, plt.cm.Set1(range(0,n)), n)
x = np.arange(99)
y = x % 11
z = x % n
plt.scatter(x, y, c=z, cmap=cm)
plt.clim(-0.5, n-0.5)
cb = plt.colorbar(ticks=range(0,n), label='Group')
cb.ax.tick_params(length=0)

which produces the image below. The n in the call to Set1 specifies the first n colors of that colormap, and the last n in the call to from_list specifies to construct a map with n colors (the default being 256). In order to set cm as the default colormap with plt.set_cmap, I found it to be necessary to give it a name and register it, viz:

cm = from_list('Set15', plt.cm.Set1(range(0,n)), n)
plt.cm.register_cmap(None, cm)
plt.set_cmap(cm)
...
plt.scatter(x, y, c=z)

Rails 4 - passing variable to partial

ou are able to create local variables once you call the render function on a partial, therefore if you want to customize a partial you can for example render the partial _form.html.erb by:

<%= render 'form', button_label: "Create New Event", url: new_event_url %>
<%= render 'form', button_label: "Update Event", url: edit_event_url %>

this way you can access in the partial to the label for the button and the URL, those are different if you try to create or update a record. finally, for accessing to this local variables you have to put in your code local_assigns[:button_label] (local_assigns[:name_of_your_variable])

<%=form_for(@event, url: local_assigns[:url]) do |f|  %>
<%= render 'shared/error_messages_events' %>
<%= f.label :title ,"Title"%>
  <%= f.text_field :title, class: 'form-control'%>
  <%=f.label :date, "Date"%>
  <%=f.date_field :date, class: 'form-control'  %>
  <%=f.label :description, "Description"%>
  <%=f.text_area :description, class: 'form-control'  %>
  <%= f.submit local_assigns[:button_label], class:"btn btn-primary"%>
<%end%>

Using WGET to run a cronjob PHP

you can just use this code to hit the script using cron job using cpanel:

wget https://www.example.co.uk/unique-code

Where are logs located?

In Laravel 6, by default the logs are in:

storage/logs/laravel.log

Permanently hide Navigation Bar in an activity

You can hide navigation bar, just call this method on your onCreate(),

 public void FullScreencall() {
    if(Build.VERSION.SDK_INT < 19){ 
        View v = this.getWindow().getDecorView();
        v.setSystemUiVisibility(View.GONE);
    } else {
            //for higher api versions.    
        View decorView = getWindow().getDecorView(); 
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        decorView.setSystemUiVisibility(uiOptions);
    }
}

This will hide whole nagiation panel.hope it helps you

Convert JsonObject to String

There is an inbuilt method to convert a JSONObject to a String. Why don't you use that:

JSONObject json = new JSONObject();

json.toString();

Anaconda Installed but Cannot Launch Navigator

How I solved this issue: 1. Be connected to the internet. 2. Open the Anaconda Prompt (looks like a regular command window). If you installed the .exe in your /name/user/ location you should be fine, if not navigate to it. Then start an environment.

conda info --envs

Then run

conda install -c anaconda anaconda-navigator

Press y when prompted (if prompted). It will being downloading the packages needed.

Then run your newly installed Anaconda Navigator

anaconda-navigator

It should start, and also appear in your regular windows 10 apps list.

How do I set an absolute include path in PHP?

What I do is put a config.php file in my root directory. This file is included by all PHP files in my project. In that config.php file, I then do the following;

define( 'ROOT_DIR', dirname(__FILE__) );

Then in all files, I know what the root of my project is and can do stuff like this

require_once( ROOT_DIR.'/include/functions.php' );

Sorry, no bonus points for getting outside of the public directory ;) This also has the unfortunate side affect that you still need a relative path for finding config.php, but it makes the rest of your includes much easier.

How does autowiring work in Spring?

How does @Autowired work internally?

Example:

class EnglishGreeting {
   private Greeting greeting;
   //setter and getter
}

class Greeting {
   private String message;
   //setter and getter
}

.xml file it will look alike if not using @Autowired:

<bean id="englishGreeting" class="com.bean.EnglishGreeting">
   <property name="greeting" ref="greeting"/>
</bean>

<bean id="greeting" class="com.bean.Greeting">
   <property name="message" value="Hello World"/>
</bean>

If you are using @Autowired then:

class EnglishGreeting {
   @Autowired //so automatically based on the name it will identify the bean and inject.
   private Greeting greeting;
   //setter and getter
}

.xml file it will look alike if not using @Autowired:

<bean id="englishGreeting" class="com.bean.EnglishGreeting"></bean>

<bean id="greeting" class="com.bean.Greeting">
   <property name="message" value="Hello World"/>
</bean>

If still have some doubt then go through below live demo

How does @Autowired work internally ?

Generating UML from C++ code?

Whoever wants UML deserves Rational Rose :)

Programs & Examples On #Ray

I am receiving warning in Facebook Application using PHP SDK

PHP array value passes to next row

Adding a UISegmentedControl to UITableView

How to use a global array in C#?

Pass PDO prepared statement to variables

C# - insert values from file into two arrays

Parameter binding on left joins with array in Laravel Query Builder

Use NSInteger as array index

I need to know how to get my program to output the word i typed in and also the new rearranged word using a 2D array

strange error in my Animation Drawable

Hadoop MapReduce: Strange Result when Storing Previous Value in Memory in a Reduce Class (Java)

javascript, for loop defines a dynamic variable name

Got a NumberFormatException while trying to parse a text file for objects

Querying date field in MongoDB with Mongoose

Real time face detection OpenCV, Python

Are these methods thread safe?

Laravel 4 with Sentry 2 add user to a group on Registration

How do I show a message in the foreach loop?

Message: Trying to access array offset on value of type null

Array and string offset access syntax with curly braces is deprecated

Unable to allocate array with shape and data type

Element implicitly has an 'any' type because expression of type 'string' can't be used to index

Adding Git-Bash to the new Windows Terminal

Steps

Notes

Typescript: No index signature with a parameter of type 'string' was found on type '{ "A": string; }

Alternative syntax

How to fix 'Object arrays cannot be loaded when allow_pickle=False' for imdb.load_data() function?

How to fix missing dependency warning when using useEffect React Hook?

How to set value to form control in Reactive Forms in Angular

Push method in React Hooks (useState)?

Typescript: Type X is missing the following properties from type Y length, pop, push, concat, and 26 more. [2740]

OpenCV TypeError: Expected cv::UMat for argument 'src' - What is this?

useState set method not reflecting change immediately

React hooks useState Array

Why do I keep getting Delete 'cr' [prettier/prettier]?

Numpy, multiply array with scalar

Objects are not valid as a React child. If you meant to render a collection of children, use an array instead

Iterating over arrays in Python 3

Find the smallest positive integer that does not occur in a given sequence

Angular: How to download a file from HttpClient?

Best way to "push" into C# array

Sort Array of object by object field in Angular 6

Uncaught SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>)

TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array

Pytorch tensor to numpy array

Checking for duplicate strings in JavaScript array

After Spring Boot 2.0 migration: jdbcUrl is required with driverClassName

Failed linking file resources

PackagesNotFoundError: The following packages are not available from current channels:

scikit-learn on Anaconda-Jupyter Notebook.

Run the following commands in the terminal:

Note: Don't use pip command if you are using Anaconda or Miniconda

ReferenceError: fetch is not defined

Numpy Resize/Rescale Image

phpmyadmin - count(): Parameter must be an array or an object that implements Countable

JS map return object

forEach() in React JSX does not output any HTML

what does numpy ndarray shape do?

Angular Material: mat-select not selecting default

Add items in array angular 4

How to round a numpy array?

How to import JSON File into a TypeScript file?

numpy array TypeError: only integer scalar arrays can be converted to a scalar index

Merge two array of objects based on a key

How to update an "array of objects" with Firestore?

Use Async/Await with Axios in React.js

Convert np.array of type float64 to type uint8 scaling values

Please add a @Pipe/@Directive/@Component annotation. Error

Laravel 5.5 ajax call 419 (unknown status)

Angular HttpClient "Http failure during parsing"

LabelEncoder: TypeError: '>' not supported between instances of 'float' and 'str'

How to add an item to an ArrayList in Kotlin?

Iterate over array of objects in Typescript

"The page has expired due to inactivity" - Laravel 5.5

How to increment a letter N times per iteration and store in an array?

Property 'json' does not exist on type 'Object'

Counting unique values in a column in pandas dataframe like in Qlik?

Edit to add condition

`json.dumps()` is used to decode JSON data

`json.loads()` is used to convert JSON data into Python data.