How do I create my own URL protocol? (e.g. so://...)

Here's a list of the registered URI schemes. Each one has an RFC - a document defining it, which is almost a standard. The RFC tells the developers of new applications (such as browsers, ftp clients, etc.) what they need to support. If you need a new base-level protocol, you can use an unregistered one. The other answers tell you how. Please keep in mind you can do lots of things with the existing protocols, thus gaining their existing implementations.

Difference between array_push() and $array[] =

I know this is an old answer but it might be helpful for others to know that another difference between the two is that if you have to add more than 2/3 values per loop to an array it's faster to use:

     for($i = 0; $i < 10; $i++){
          array_push($arr, $i, $i*2, $i*3, $i*4, ...)
     }

instead of:

     for($i = 0; $i < 10; $i++){
         $arr[] = $i;
         $arr[] = $i*2;
         $arr[] = $i*3;
         $arr[] = $i*4;
         ...
     }

edit- Forgot to close the bracket for the for conditional

The server encountered an internal error or misconfiguration and was unable to complete your request

You should look for the error in the file error_log in the log directory. Maybe there are differences between your local and server configuration (db user/password etc.etc.)

usually the log file is in

/var/log/apache2/error.log

/var/log/httpd/error.log

How to create a video from images with FFmpeg?

cat *.png | ffmpeg -f image2pipe -i - output.mp4

from wiki

How to modify existing XML file with XmlDocument and XmlNode in C#

You need to do something like this:

// instantiate XmlDocument and load XML from file
XmlDocument doc = new XmlDocument();
doc.Load(@"D:\test.xml");

// get a list of nodes - in this case, I'm selecting all <AID> nodes under
// the <GroupAIDs> node - change to suit your needs
XmlNodeList aNodes = doc.SelectNodes("/Equipment/DataCollections/GroupAIDs/AID");

// loop through all AID nodes
foreach (XmlNode aNode in aNodes)
{
   // grab the "id" attribute
   XmlAttribute idAttribute = aNode.Attributes["id"];

   // check if that attribute even exists...
   if (idAttribute != null)
   {
      // if yes - read its current value
      string currentValue = idAttribute.Value;

      // here, you can now decide what to do - for demo purposes,
      // I just set the ID value to a fixed value if it was empty before
      if (string.IsNullOrEmpty(currentValue))
      {
         idAttribute.Value = "515";
      }
   }
}

// save the XmlDocument back to disk
doc.Save(@"D:\test2.xml");

assigning column names to a pandas series

If you have a pd.Series object x with index named 'Gene', you can use reset_index and supply the name argument:

df = x.reset_index(name='count')

Here's a demo:

x = pd.Series([2, 7, 1], index=['Ezh2', 'Hmgb', 'Irf1'])
x.index.name = 'Gene'

df = x.reset_index(name='count')

print(df)

   Gene  count
0  Ezh2      2
1  Hmgb      7
2  Irf1      1

How to display special characters in PHP

Try This

Input:

<!DOCTYPE html>
<html>
<body>

<?php
$str = "This is some <b>bold</b> text.";
echo htmlspecialchars($str);
?>

<p>Converting &lt; and &gt; into entities are often used to prevent browsers from using it as an HTML element. <br />This can be especially useful to prevent code from running when users have access to display input on your homepage.</p>

</body>
</html>

Output:

This is some <b>bold</b> text.

Converting < and > into entities are often used to prevent browsers from using it as an HTML element. This can be especially useful to prevent code from running when users have access to display input on your homepage.

How to make a simple image upload using Javascript/HTML

<li class="list-group-item active"><h5>Feaured Image</h5></li>
            <li class="list-group-item">
                <div class="input-group mb-3">
                    <div class="custom-file ">
                        <input type="file"  class="custom-file-input" name="thumbnail" id="thumbnail">
                        <label class="custom-file-label" for="thumbnail">Choose file</label>
                    </div>
                </div>
                <div class="img-thumbnail  text-center">
                    <img src="@if(isset($product)) {{asset('storage/'.$product->thumbnail)}} @else {{asset('images/no-thumbnail.jpeg')}} @endif" id="imgthumbnail" class="img-fluid" alt="">
                </div>
            </li>
<script>
$(function(){
$('#thumbnail').on('change', function() {
    var file = $(this).get(0).files;
    var reader = new FileReader();
    reader.readAsDataURL(file[0]);
    reader.addEventListener("load", function(e) {
    var image = e.target.result;
$("#imgthumbnail").attr('src', image);
});
});
}
</script>

Call and receive output from Python script in Java?

You can include the Jython library in your Java Project. You can download the source code from the Jython project itself.

Jython does offers support for JSR-223 which basically lets you run a Python script from Java.

You can use a ScriptContext to configure where you want to send your output of the execution.

For instance, let's suppose you have the following Python script in a file named numbers.py:

for i in range(1,10):
    print(i)

So, you can run it from Java as follows:

public static void main(String[] args) throws ScriptException, IOException {

    StringWriter writer = new StringWriter(); //ouput will be stored here

    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptContext context = new SimpleScriptContext();

    context.setWriter(writer); //configures output redirection
    ScriptEngine engine = manager.getEngineByName("python");
    engine.eval(new FileReader("numbers.py"), context);
    System.out.println(writer.toString()); 
}

And the output will be:

As long as your Python script is compatible with Python 2.5 you will not have any problems running this with Jython.

Get all child views inside LinearLayout at once

Get all views from any type of layout

public List<View> getAllViews(ViewGroup layout){
        List<View> views = new ArrayList<>();
        for(int i =0; i< layout.getChildCount(); i++){
            views.add(layout.getChildAt(i));
        }
        return views;
}

Get all TextView from any type of layout

public List<TextView> getAllTextViews(ViewGroup layout){
        List<TextView> views = new ArrayList<>();
        for(int i =0; i< layout.getChildCount(); i++){
            View v =layout.getChildAt(i);
            if(v instanceof TextView){
                views.add((TextView)v);
            }
        }
        return views;
}

Bigger Glyphicons

In my case, I had an input-group-btn with a button, and this button was a little bigger than its container. So I just gave font-size:95% for my glyphicon and it was solved.

<div class="input-group">
    <input type="text" class="form-control" id="pesquisarinbox" placeholder="Pesquisar na Caixa de Entrada">
    <div class="input-group-btn">
        <button class="btn btn-default" type="button">
            <span class="glyphicon glyphicon-search" style="font-size:95%;"></span>
        </button>
    </div>  
</div>

How can I select item with class within a DIV?

If you want to select every element that has class attribute "myclass" use

$('#mydiv .myclass');

If you want to select only div elements that has class attribute "myclass" use

$("div#mydiv div.myclass");

find more about jquery selectors refer these articles

window.onload vs <body onload=""/>

There is no difference, but you should not use either.

In many browsers, the window.onload event is not triggered until all images have loaded, which is not what you want. Standards based browsers have an event called DOMContentLoaded which fires earlier, but it is not supported by IE (at the time of writing this answer). I'd recommend using a javascript library which supports a cross browser DOMContentLoaded feature, or finding a well written function you can use. jQuery's $(document).ready(), is a good example.

Row count with PDO

As it often happens, this question is confusing as hell. People are coming here having two different tasks in mind:

They need to know how many rows in the table
They need to know whether a query returned any rows

That's two absolutely different tasks that have nothing in common and cannot be solved by the same function. Ironically, for neither of them the actual PDOStatement::rowCount() function has to be used.

Let's see why

Counting rows in the table

Before using PDO I just simply used mysql_num_rows().

Means you already did it wrong. Using mysql_num_rows() or rowCount() to count the number of rows in the table is a real disaster in terms of consuming the server resources. A database has to read all the rows from the disk, consume the memory on the database server, then send all this heap of data to PHP, consuming PHP process' memory as well, burdening your server with absolute no reason.
Besides, selecting rows only to count them simply makes no sense. A count(*) query has to be run instead. The database will count the records out of the index, without reading the actual rows and then only one row returned.

For this purpose the code suggested in the accepted answer is fair, save for the fact it won't be an "extra" query but the only query to run.

Counting the number rows returned.

The second use case is not as disastrous as rather pointless: in case you need to know whether your query returned any data, you always have the data itself!

Say, if you are selecting only one row. All right, you can use the fetched row as a flag:

$stmt->execute();
$row = $stmt->fetch();
if (!$row) { // here! as simple as that
    echo 'No data found';
}

In case you need to get many rows, then you can use fetchAll().

fetchAll() is something I won't want as I may sometimes be dealing with large datasets

Yes of course, for the first use case it would be twice as bad. But as we learned already, just don't select the rows only to count them, neither with rowCount() nor fetchAll().

But in case you are going to actually use the rows selected, there is nothing wrong in using fetchAll(). Remember that in a web application you should never select a huge amount of rows. Only rows that will be actually used on a web page should be selected, hence you've got to use LIMIT, WHERE or a similar clause in your SQL. And for such a moderate amount of data it's all right to use fetchAll(). And again, just use this function's result in the condition:

$stmt->execute();
$data = $stmt->fetchAll();
if (!$data) { // again, no rowCount() is needed!
    echo 'No data found';
}

And of course it will be absolute madness to run an extra query only to tell whether your other query returned any rows, as it suggested in the two top answers.

Counting the number of rows in a large resultset

In such a rare case when you need to select a real huge amount of rows (in a console application for example), you have to use an unbuffered query, in order to reduce the amount of memory used. But this is the actual case when rowCount() won't be available, thus there is no use for this function as well.

Hence, that's the only use case when you may possibly need to run an extra query, in case you'd need to know a close estimate for the number of rows selected.

SQL Server loop - how do I loop through a set of records

By using cursor you can easily iterate through records individually and print records separately or as a single message including all the records.

DECLARE @CustomerID as INT;
declare @msg varchar(max)
DECLARE @BusinessCursor as CURSOR;

SET @BusinessCursor = CURSOR FOR
SELECT CustomerID FROM Customer WHERE CustomerID IN ('3908745','3911122','3911128','3911421')

OPEN @BusinessCursor;
    FETCH NEXT FROM @BusinessCursor INTO @CustomerID;
    WHILE @@FETCH_STATUS = 0
        BEGIN
            SET @msg = '{
              "CustomerID": "'+CONVERT(varchar(10), @CustomerID)+'",
              "Customer": {
                "LastName": "LastName-'+CONVERT(varchar(10), @CustomerID) +'",
                "FirstName": "FirstName-'+CONVERT(varchar(10), @CustomerID)+'",    
              }
            }|'
        print @msg
    FETCH NEXT FROM @BusinessCursor INTO @CustomerID;
END

Python locale error: unsupported locale setting

One of the above answer provides the solution:

export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"
sudo dpkg-reconfigure locales

The problem with above solution is that it has to be done on the linux shell. However, if you are providing your code to work on the client machine then this is a bad approach. I also tried executing the above commands using os.system(), but still it doesn't work.

Solution that worked for me is

locale.setlocale(locale.LC_ALL,'en_US.UTF-8')

Check if any type of files exist in a directory using BATCH script

To check if a folder contains at least one file

>nul 2>nul dir /a-d "folderName\*" && (echo Files exist) || (echo No file found)

To check if a folder or any of its descendents contain at least one file

>nul 2>nul dir /a-d /s "folderName\*" && (echo Files exist) || (echo No file found)

To check if a folder contains at least one file or folder.
Note addition of /a option to enable finding of hidden and system files/folders.

dir /b /a "folderName\*" | >nul findstr "^" && (echo Files and/or Folders exist) || (echo No File or Folder found)

To check if a folder contains at least one folder

dir /b /ad "folderName\*" | >nul findstr "^" && (echo Folders exist) || (echo No folder found)

How to get client IP address in Laravel 5+

There are two things to take care of:

Get a helper function that returns a Illuminate\Http\Request and call the ->ip() method:
```
request()->ip();
```
Think of your server configuration, it may use a proxy or load-balancer, especially in an AWS ELB configuration.

If this is your case you need to follow "Configuring Trusted Proxies" or maybe even set a "Trusting All Proxies" option.

Why? Because being your server will be getting your proxy/load-balancer IP instead.

If you are on the AWS balance-loader, go to App\Http\Middleware\TrustProxies and make $proxies declaration look like this:

protected $proxies = '*';

Now test it and celebrate because you just saved yourself from having trouble with throttle middleware. It also relies on request()->ip() and without setting "TrustProxies" up, you could have all your users blocked from logging in instead of blocking only the culprit's IP.

And because throttle middleware is not explained properly in the documentation, I recommend watching "laravel 5.2 tutorial for beginner, API Rate Limiting"

Tested in Laravel 5.7

Center image in table td in CSS

Center a div inside td using margin, the trick is to make the div width same as image width.

<td>
    <div style="margin: 0 auto; width: 130px">
          <img src="me.jpg" alt="me" style="width: 130px" />
    </div>
</td>

Removing double quotes from a string in Java

You can just go for String replace method.-

line1 = line1.replace("\"", "");

How to change the order of DataFrame columns?

Simply do,

df = df[['mean'] + df.columns[:-1].tolist()]

Is it possible to include one CSS file in another?

sing the CSS @import Rule here

@import url('/css/header.css') screen;
@import url('/css/content.css') screen;
@import url('/css/sidebar.css') screen;
@import url('/css/print.css') print;

Find out where MySQL is installed on Mac OS X

Or use good old "find". For example in order to look for old mysql v5.7:

cd /
find . type -d -name "[email protected]"

How to convert image to byte array

To be convert the image to byte array.The code is give below.

public byte[] ImageToByteArray(System.Drawing.Image images)
{
   using (var _memorystream = new MemoryStream())
   {
      images.Save(_memorystream ,images.RawFormat);
      return  _memorystream .ToArray();
   }
}

To be convert the Byte array to Image.The code is given below.The code is handle A Generic error occurred in GDI+ in Image Save.

public void SaveImage(string base64String, string filepath)
{
    // image convert to base64string is base64String 
    //File path is which path to save the image.
    var bytess = Convert.FromBase64String(base64String);
    using (var imageFile = new FileStream(filepath, FileMode.Create))
    {
        imageFile.Write(bytess, 0, bytess.Length);
        imageFile.Flush();
    }
}

LINQ order by null column where order is ascending and nulls should be last

my decision:

Array = _context.Products.OrderByDescending(p => p.Val ?? float.MinValue)

Passing multiple variables in @RequestBody to a Spring MVC controller using Ajax

You are correct, @RequestBody annotated parameter is expected to hold the entire body of the request and bind to one object, so you essentially will have to go with your options.

If you absolutely want your approach, there is a custom implementation that you can do though:

Say this is your json:

{
    "str1": "test one",
    "str2": "two test"
}

and you want to bind it to the two params here:

@RequestMapping(value = "/Test", method = RequestMethod.POST)
public boolean getTest(String str1, String str2)

First define a custom annotation, say @JsonArg, with the JSON path like path to the information that you want:

public boolean getTest(@JsonArg("/str1") String str1, @JsonArg("/str2") String str2)

Now write a Custom HandlerMethodArgumentResolver which uses the JsonPath defined above to resolve the actual argument:

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.IOUtils;
import org.springframework.core.MethodParameter;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import com.jayway.jsonpath.JsonPath;

public class JsonPathArgumentResolver implements HandlerMethodArgumentResolver{

    private static final String JSONBODYATTRIBUTE = "JSON_REQUEST_BODY";
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.hasParameterAnnotation(JsonArg.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        String body = getRequestBody(webRequest);
        String val = JsonPath.read(body, parameter.getMethodAnnotation(JsonArg.class).value());
        return val;
    }

    private String getRequestBody(NativeWebRequest webRequest){
        HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
        String jsonBody = (String) servletRequest.getAttribute(JSONBODYATTRIBUTE);
        if (jsonBody==null){
            try {
                String body = IOUtils.toString(servletRequest.getInputStream());
                servletRequest.setAttribute(JSONBODYATTRIBUTE, body);
                return body;
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return "";

    }
}

Now just register this with Spring MVC. A bit involved, but this should work cleanly.

Variable's memory size in Python

Use sys.getsizeof to get the size of an object, in bytes.

>>> from sys import getsizeof
>>> a = 42
>>> getsizeof(a)
12
>>> a = 2**1000
>>> getsizeof(a)
146
>>>

Note that the size and layout of an object is purely implementation-specific. CPython, for example, may use totally different internal data structures than IronPython. So the size of an object may vary from implementation to implementation.

How to pass a value from one Activity to another in Android?

in the first Activity:

Intent i=new Intent(getApplicationContext,secondActivity.class);

i.putExtra("key",value);

startActivity(i);

and in the SecondActivity:

String value=getIntent.getStringExtra("Key");

How to write a Unit Test?

Like @CoolBeans mentioned, take a look at jUnit. Here is a short tutorial to get you started as well with jUnit 4.x

Finally, if you really want to learn more about testing and test-driven development (TDD) I recommend you take a look at the following book by Kent Beck: Test-Driven Development By Example.

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

I have the same connection error: The problem I have is I used MySQL 8.0.15 but the Java Connector is 5.x.x.

Below is how I fixed it. 1. download the 8.0.15. from Maven repository: https://search.maven.org/search?q=g:mysql%20AND%20a:mysql-connector-java

In the Eclipse IDE, select the "Referenced Libraries" in Explorer Right Mouse Button > Build Path > Configure Build Path a. remove the "mysql-connector-5.x.jar" b. Click "Add External JARs..." and select mysql-connector-java-8.0.15.jar.

Re-run it, the problem went away.

Return sql rows where field contains ONLY non-alphanumeric characters

SQL Server doesn't have regular expressions. It uses the LIKE pattern matching syntax which isn't the same.

As it happens, you are close. Just need leading+trailing wildcards and move the NOT

 WHERE whatever NOT LIKE '%[a-z0-9]%'

Check if string is in a pandas dataframe

I bumped into the same problem, I used:

if "Mel" in a["Names"].values:
    print("Yep")

But this solution may be slower since internally pandas create a list from a Series.

How do I find which rpm package supplies a file I'm looking for?

This is an old question, but the current answers are incorrect :)

Use yum whatprovides, with the absolute path to the file you want (which may be wildcarded). For example:

yum whatprovides '*bin/grep'

Returns

grep-2.5.1-55.el5.x86_64 : The GNU versions of grep pattern matching utilities.
Repo        : base
Matched from:
Filename    : /bin/grep

You may prefer the output and speed of the repoquery tool, available in the yum-utils package.

sudo yum install yum-utils
repoquery --whatprovides '*bin/grep'
grep-0:2.5.1-55.el5.x86_64
grep-0:2.5.1-55.el5.x86_64

repoquery can do other queries such as listing package contents, dependencies, reverse-dependencies, etc.

How to check if an Object is a Collection Type in Java?

if (x instanceof Collection<?>){
}

if (x instanceof Map<?,?>){
}

How to empty (clear) the logcat buffer in Android

adb logcat -c

Logcat options are documented here: http://developer.android.com/tools/help/logcat.html

Inverse of a matrix using numpy

What about inv?

e.g.: my_inverse_array = inv(my_array)

CSS Resize/Zoom-In effect on Image while keeping Dimensions

You could achieve that simply by wrapping the image by a <div> and adding overflow: hidden to that element:

<div class="img-wrapper">
    <img src="..." />
</div>

.img-wrapper {
    display: inline-block; /* change the default display type to inline-block */
    overflow: hidden;      /* hide the overflow */
}

WORKING DEMO.

Also it's worth noting that <img> element (like the other inline elements) sits on its baseline by default. And there would be a 4~5px gap at the bottom of the image.

That vertical gap belongs to the reserved space of descenders like: g j p q y. You could fix the alignment issue by adding vertical-align property to the image with a value other than baseline.

Additionally for a better user experience, you could add transition to the images.

Thus we'll end up with the following:

.img-wrapper img {
    transition: all .2s ease;
    vertical-align: middle;
}

UPDATED DEMO.

How can I get the root domain URI in ASP.NET?

string hostUrl = Request.Url.Scheme + "://" + Request.Url.Host; //should be "http://hostnamehere.com"

How to use System.Net.HttpClient to post a complex type?

Note that if you are using a Portable Class Library, HttpClient will not have PostAsJsonAsync method. To post a content as JSON using a Portable Class Library, you will have to do this:

HttpClient client = new HttpClient();
HttpContent contentPost = new StringContent(argsAsJson, Encoding.UTF8, 
"application/json");

await client.PostAsync(new Uri(wsUrl), contentPost).ContinueWith(
(postTask) => postTask.Result.EnsureSuccessStatusCode());

What is the most efficient way to create HTML elements using jQuery?

personally i'd suggest (for readability):

$('<div>');

some numbers on the suggestions so far (safari 3.2.1 / mac os x):

var it = 50000;

var start = new Date().getTime();
for (i = 0; i < it; ++i)  {
  // test creation of an element 
  // see below statements
}
var end = new Date().getTime();
alert( end - start );                

var e = $( document.createElement('div') );  // ~300ms
var e = $('<div>');                          // ~3100ms
var e = $('<div></div>');                    // ~3200ms
var e = $('<div/>');                         // ~3500ms

WARNING: Can't verify CSRF token authenticity rails

If I remember correctly, you have to add the following code to your form, to get rid of this problem:

<%= token_tag(nil) %>

Don't forget the parameter.

Why am I getting this redefinition of class error?

If you are having issues with templates or you are calling the class from another .cpp file

try using '#pragma once' in your header file.

Git - push current branch shortcut

If you are using git 1.7.x, you can run the following command to set the remote tracking branch.

git branch --set-upstream feature/123-sandbox-tests origin/feature/123-sandbox-tests

Then you can simply use git push to push all the changes. For a more complete answer, please see the accepted answer to a similar question here.

If you only want to push the current branch with the push command, then you can change the push behaviour to upstream:

git config --global push.default upstream

How to extract a single value from JSON response?

Extract single value from JSON response Python

Try this

import json
import sys

#load the data into an element
data={"test1" : "1", "test2" : "2", "test3" : "3"}

#dumps the json object into an element
json_str = json.dumps(data)

#load the json to a string
resp = json.loads(json_str)

#print the resp
print (resp)

#extract an element in the response
print (resp['test1'])

How can I make content appear beneath a fixed DIV element?

I liked grdevphl's Javascript answer best, but in my own use case, I found that using height() in the calculation still left a little overlap since it didn't take padding into account. If you run into the same issue, try outerHeight() instead to compensate for padding and border.

$(document).ready(function() {
    var contentPlacement = $('#header').position().top + $('#header').outerHeight();
    $('#content').css('margin-top',contentPlacement);
});

jQuery: keyPress Backspace won't fire?

I came across this myself. I used .on so it looks a bit different but I did this:

 $('#element').on('keypress', function() {
   //code to be executed
 }).on('keydown', function(e) {
   if (e.keyCode==8)
     $('element').trigger('keypress');
 });

Adding my Work Around here. I needed to delete ssn typed by user so i did this in jQuery

  $(this).bind("keydown", function (event) {
        // Allow: backspace, delete
        if (event.keyCode == 46 || event.keyCode == 8) 
        {
            var tempField = $(this).attr('name');
            var hiddenID = tempField.substr(tempField.indexOf('_') + 1);
            $('#' + hiddenID).val('');
            $(this).val('')
            return;
        }  // Allow: tab, escape, and enter
        else if (event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 ||
        // Allow: Ctrl+A
        (event.keyCode == 65 && event.ctrlKey === true) ||
        // Allow: home, end, left, right
        (event.keyCode >= 35 && event.keyCode <= 39)) {
            // let it happen, don't do anything
            return;
        }
        else 
        {
            // Ensure that it is a number and stop the keypress
            if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) &&       (event.keyCode < 96 || event.keyCode > 105)) 
            {
                event.preventDefault();
            }
        }
    });

Why doesn't git recognize that my file has been changed, therefore git add not working

I had a problem where once upon a time I set the git index to 'assume unchanged' on my file.

You can tell git to stop ignoring changes to the file with:

git update-index --no-assume-unchanged path/to/file

If that doesn't help a reset may be enough for other weird cases.

In practice I found removing the cached file and resetting it to work:

git rm --cached path/to/file
git reset path/to/file

The git rm --cached means to only remove the file from the index, and reset tells git to reload the git index from the last commit.

PostgreSQL JOIN data from 3 tables

Something like:

select t1.name, t2.image_id, t3.path
from table1 t1 inner join table2 t2 on t1.person_id = t2.person_id
inner join table3 t3 on t2.image_id=t3.image_id

Open web in new tab Selenium + Python

I tried for a very long time to duplicate tabs in Chrome running using action_keys and send_keys on body. The only thing that worked for me was an answer here. This is what my duplicate tabs def ended up looking like, probably not the best but it works fine for me.

def duplicate_tabs(number, chromewebdriver):
#Once on the page we want to open a bunch of tabs
url = chromewebdriver.current_url
for i in range(number):
    print('opened tab: '+str(i))
    chromewebdriver.execute_script("window.open('"+url+"', 'new_window"+str(i)+"')")

It basically runs some java from inside of python, it's incredibly useful. Hope this helps somebody.

Note: I am using Ubuntu, it shouldn't make a difference but if it doesn't work for you this could be the reason.

Regex allow a string to only contain numbers 0 - 9 and limit length to 45

Rails doesnt like the using of ^ and $ for some security reasons , probably its better to use \A and \z to set the beginning and the end of the string

IOS: verify if a point is inside a rect

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
            UITouch *touch = [[event allTouches] anyObject];
            CGPoint touchLocation = [touch locationInView:self.view];
            CGRect rect1 = CGRectMake(vwTable.frame.origin.x, 
            vwTable.frame.origin.y, vwTable.frame.size.width, 
            vwTable.frame.size.height);
            if (CGRectContainsPoint(rect1,touchLocation))
            NSLog(@"Inside");
            else
            NSLog(@"Outside");
    }

ImportError in importing from sklearn: cannot import name check_build

I had the same issue on Windows. Solved it by installing Numpy+MKL from http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy (there it's recommended to install numpy+mkl before other packages that depend on it) as suggested by this answer.

What is polymorphism, what is it for, and how is it used?

What is polymorphism?

Polymorphism is the ability to:

Invoke an operation on an instance of a specialized type by only knowing its generalized type while calling the method of the specialized type and not that of the generalized type: it is dynamic polymorphism.
Define several methods having the save name but having differents parameters: it is static polymorphism.

The first if the historical definition and the most important.

What is polymorphism used for?

It allows to create strongly-typed consistency of the class hierarchy and to do some magical things like managing lists of objects of differents types without knowing their types but only one of their parent type, as well as data bindings.

Strong and weak typing

Sample

Here are some Shapes like Point, Line, Rectangle and Circle having the operation Draw() taking either nothing or either a parameter to set a timeout to erase it.

public class Shape
{
 public virtual void Draw()
 {
   DoNothing();
 }
 public virtual void Draw(int timeout)
 {
   DoNothing();
 }
}

public class Point : Shape
{
 int X, Y;
 public override void Draw()
 {
   DrawThePoint();
 }
}

public class Line : Point
{
 int Xend, Yend;
 public override Draw()
 {
   DrawTheLine();
 }
}

public class Rectangle : Line
{
 public override Draw()
 {
   DrawTheRectangle();
 }
}

var shapes = new List<Shape> { new Point(0,0), new Line(0,0,10,10), new rectangle(50,50,100,100) };

foreach ( var shape in shapes )
  shape.Draw();

Here the Shape class and the Shape.Draw() methods should be marked as abstract.

They are not for to make understand.

Explaination

Without polymorphism, using abstract-virtual-override, while parsing the shapes, it is only the Spahe.Draw() method that is called as the CLR don't know what method to call. So it call the method of the type we act on, and here the type is Shape because of the list declaration. So the code do nothing at all.

With polymorphism, the CLR is able to infer the real type of the object we act on using what is called a virtual table. So it call the good method, and here calling Shape.Draw() if Shape is Point calls the Point.Draw(). So the code draws the shapes.

Mysql password expired. Can't connect

Just download MySQL workbench to log in. It will prompt you to change the password immediately and automatically.

Return the most recent record from ElasticSearch index

I used @timestamp instead of _timestamp

{
    'size' : 1,
    'query': {
        'match_all' : {}
            },
    "sort" : [{"@timestamp":{"order": "desc"}}]
}

How to access SVG elements with Javascript

In case you use jQuery you need to wait for $(window).load, because the embedded SVG document might not be yet loaded at $(document).ready

$(window).load(function () {

    //alert("Document loaded, including graphics and embedded documents (like SVG)");
    var a = document.getElementById("alphasvg");

    //get the inner DOM of alpha.svg
    var svgDoc = a.contentDocument;

    //get the inner element by id
    var delta = svgDoc.getElementById("delta");
    delta.addEventListener("mousedown", function(){ alert('hello world!')}, false);
});

Material Design not styling alert dialogs

You can consider this project: https://github.com/fengdai/AlertDialogPro

It can provide you material theme alert dialogs almost the same as lollipop's. Compatible with Android 2.1.

XAMPP Start automatically on Windows 7 startup

Go to the Config button (up right) and select the Autostart for Apache. enter image description here

Open CSV file via VBA (performance)

Sometimes all the solutions with Workbooks.open is not working no matter how many parameters are set. For me, the fastest solution was to change the List separator in Region & language settings. Region window / Additional settings... / List separator.

If csv is not opening in proper way You probly have set ',' as a list separator. Just change it to ';' and everything is solved. Just the easiest way when "everything is against You" :P

How to run cron once, daily at 10pm

Here is what I look at everytime I am writing a new crontab entry:

To start editing from terminal -type:

 zee$ crontab -e

what you will add to crontab file:

0 22 * * 0  some-user /opt/somescript/to/run.sh

What it means:

[ 
+ user => 'some-user',      
+ minute => ‘0’,             <<= on top of the hour.
+ hour => '22',              <<= at 10 PM. Military time.
+ monthday => '*',           <<= Every day of the month*
+ month => '*',              <<= Every month*
+ weekday => ‘0’,            <<= Everyday (0 thru 6) = sunday thru saturday
]

Also, check what shell your machine is running and name the the file accordingly OR it wont execute.

Check the shell with either echo $SHELL or echo $0

It can be "Bourne shell (sh) , Bourne again shell (bash),Korn shell (ksh)..etc"

How to only find files in a given directory, and ignore subdirectories using bash

This may do what you want:

find /dev \( ! -name /dev -prune \) -type f -print

How to Batch Rename Files in a macOS Terminal?

You could use sed:

ls * | sed -e 'p;s@_.*_@_@g' | xargs -n2 mv

result:

prefix_567.png prefix_efg.png

*to do a dry-run first, replace mv at the end with echo

Explanation:

e: optional for only 1 sed command.
p: to print the input to sed, in this case it will be the original file name before any renaming
@: is a replacement of / character to make sed more readable. That is, instead of using sed s/search/replace/g, use s@search@replace@g
_.* : the underscore is an escape character to refer to the actual '.' character zero or more times (as opposed to ANY character in regex)
-n2: indicates that there are 2 outputs that need to be passed on to mv as parameters. for each input from ls, this sed command will generate 2 output, which will then supplied to mv.

How to convert this var string to URL in Swift

in swift 4 to convert to url use URL

let fileUrl = URL.init(fileURLWithPath: filePath)

let fileUrl = URL(fileURLWithPath: filePath)

How can I make a div not larger than its contents?

You can try fit-content (CSS3):

div {
  width: fit-content; 
  /* To adjust the height as well */ 
  height: fit-content;
}

Two Radio Buttons ASP.NET C#

I can see it's an old question, if you want to put other HTML inside could use the radiobutton with GroupName propery same in all radiobuttons and in the Text property set something like an image or the html you need.

   <asp:RadioButton GroupName="group1" runat="server" ID="paypalrb" Text="<img src='https://www.paypalobjects.com/webstatic/mktg/logo/bdg_secured_by_pp_2line.png' border='0' alt='Secured by PayPal' style='width: 103px; height: 61px; padding:10px;'>" />

How to properly make a http web GET request

Servers sometimes compress their responses to save on bandwidth, when this happens, you need to decompress the response before attempting to read it. Fortunately, the .NET framework can do this automatically, however, we have to turn the setting on.

Here's an example of how you could achieve that.

string html = string.Empty;
string url = @"https://api.stackexchange.com/2.2/answers?order=desc&sort=activity&site=stackoverflow";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.AutomaticDecompression = DecompressionMethods.GZip;

using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(stream))
{
    html = reader.ReadToEnd();
}

Console.WriteLine(html);

GET

public string Get(string uri)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

    using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    using(Stream stream = response.GetResponseStream())
    using(StreamReader reader = new StreamReader(stream))
    {
        return reader.ReadToEnd();
    }
}

GET async

public async Task<string> GetAsync(string uri)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

    using(HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
    using(Stream stream = response.GetResponseStream())
    using(StreamReader reader = new StreamReader(stream))
    {
        return await reader.ReadToEndAsync();
    }
}

POST
Contains the parameter method in the event you wish to use other HTTP methods such as PUT, DELETE, ETC

public string Post(string uri, string data, string contentType, string method = "POST")
{
    byte[] dataBytes = Encoding.UTF8.GetBytes(data);

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    request.ContentLength = dataBytes.Length;
    request.ContentType = contentType;
    request.Method = method;

    using(Stream requestBody = request.GetRequestStream())
    {
        requestBody.Write(dataBytes, 0, dataBytes.Length);
    }

    using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    using(Stream stream = response.GetResponseStream())
    using(StreamReader reader = new StreamReader(stream))
    {
        return reader.ReadToEnd();
    }
}

POST async
Contains the parameter method in the event you wish to use other HTTP methods such as PUT, DELETE, ETC

public async Task<string> PostAsync(string uri, string data, string contentType, string method = "POST")
{
    byte[] dataBytes = Encoding.UTF8.GetBytes(data);

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    request.ContentLength = dataBytes.Length;
    request.ContentType = contentType;
    request.Method = method;

    using(Stream requestBody = request.GetRequestStream())
    {
        await requestBody.WriteAsync(dataBytes, 0, dataBytes.Length);
    }

    using(HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
    using(Stream stream = response.GetResponseStream())
    using(StreamReader reader = new StreamReader(stream))
    {
        return await reader.ReadToEndAsync();
    }
}

How to search for an element in an stl list?

Besides using std::find (from algorithm), you can also use std::find_if (which is, IMO, better than std::find), or other find algorithm from this list

#include <list>
#include <algorithm>
#include <iostream>

int main()
{
    std::list<int> myList{ 5, 19, 34, 3, 33 };
    

    auto it = std::find_if( std::begin( myList ),
                            std::end( myList ),
                            [&]( const int v ){ return 0 == ( v % 17 ); } );
        
    if ( myList.end() == it )
    {
        std::cout << "item not found" << std::endl;
    }
    else
    {
        const int pos = std::distance( myList.begin(), it ) + 1;
        std::cout << "item divisible by 17 found at position " << pos << std::endl;
    }
}

How do I import a CSV file in R?

You would use the read.csv function; for example:

dat = read.csv("spam.csv", header = TRUE)

You can also reference this tutorial for more details.

Note: make sure the .csv file to read is in your working directory (using getwd()) or specify the right path to file. If you want, you can set the current directory using setwd.

How do I center a Bootstrap div with a 'spanX' class?

Twitter's bootstrap .span classes are floated to the left so they won't center by usual means. So, if you want it to center your span simply add float:none to your #main rule.

CSS

#main {
 margin:0 auto;
 float:none;
}

pandas how to check dtype for all columns in a dataframe?

The singular form dtype is used to check the data type for a single column. And the plural form dtypes is for data frame which returns data types for all columns. Essentially:

For a single column:

dataframe.column.dtype

For all columns:

dataframe.dtypes

Example:

import pandas as pd
df = pd.DataFrame({'A': [1,2,3], 'B': [True, False, False], 'C': ['a', 'b', 'c']})

df.A.dtype
# dtype('int64')
df.B.dtype
# dtype('bool')
df.C.dtype
# dtype('O')

df.dtypes
#A     int64
#B      bool
#C    object
#dtype: object

Replace \n with actual new line in Sublime Text

For Windows line endings:

(Turn on regex - Alt+R)

Find: \\r\\n

Replace: \r\n

How do I create a ListView with rounded corners in Android?

Yet another solution to selection highlight problems with first, and last items in the list:

Add padding to the top and bottom of your list background equal to or greater than the radius. This ensures the selection highlighting doesn't overlap with your corner curves.

This is the easiest solution when you need non-transparent selection highlighting.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="@color/listbg" />
    <stroke
        android:width="2dip"
        android:color="#D5D5D5" />
    <corners android:radius="10dip" />

    <!-- Make sure bottom and top padding match corner radius -->
    <padding
        android:bottom="10dip"
        android:left="2dip"
        android:right="2dip"
        android:top="10dip" />
</shape>

Apache shows PHP code instead of executing it

In my case with PHP7.3 Apache2.4 Ubuntu 18.04 I had to execute:

$ a2enmod actions fastcgi alias proxy_fcgi

Excel compare two columns and highlight duplicates

The easiest way to do it, at least for me, is:

Conditional format-> Add new rule->Set your own formula:

=ISNA(MATCH(A2;$B:$B;0))

Where A2 is the first element in column A to be compared and B is the column where A's element will be searched.

Once you have set the formula and picked the format, apply this rule to all elements in the column.

Hope this helps

Why this line xmlns:android="http://schemas.android.com/apk/res/android" must be the first in the layout xml file?

I think it makes clear with the namespace, as we can create our own attributes and if the user specified attribute is the same as the Android one it avoid the conflict of the namespace.

"You have mail" message in terminal, os X

As inspiredlife explained, you can figure out whats happening using mail command.

If you don't want to delete bunch of unrelated / auto-generated messages one by one (like me), simply run the command below to get rid of all messages:

echo -n > /var/mail/yourusername

Removing all script tags from html with JS Regular Expression

If you want to remove all JavaScript code from some HTML text, then removing <script> tags isn't enough, because JavaScript can still live in "onclick", "onerror", "href" and other attributes.

Try out this npm module which handles all of this: https://www.npmjs.com/package/strip-js

How to get a List<string> collection of values from app.config in WPF?

You could have them semi-colon delimited in a single value, e.g.

App.config

<add key="paths" value="C:\test1;C:\test2;C:\test3" />

var paths = new List<string>(ConfigurationManager.AppSettings["paths"].Split(new char[] { ';' }));

Call php function from JavaScript

I recently published a jQuery plugin which allows you to make PHP function calls in various ways: https://github.com/Xaxis/jquery.php

Simple example usage:

// Both .end() and .data() return data to variables
var strLenA = P.strlen('some string').end();
var strLenB = P.strlen('another string').end();
var totalStrLen = strLenA + strLenB;
console.log( totalStrLen ); // 25

// .data Returns data in an array
var data1 = P.crypt("Some Crypt String").data();
console.log( data1 ); // ["$1$Tk1b01rk$shTKSqDslatUSRV3WdlnI/"]

Updating a java map entry

If key is present table.put(key, val) will just overwrite the value else it'll create a new entry. Poof! and you are done. :)

you can get the value from a map by using key is table.get(key); That's about it

Can an AJAX response set a cookie?

According to the w3 spec section 4.6.3 for XMLHttpRequest a user agent should honor the Set-Cookie header. So the answer is yes you should be able to.

Quotation:

If the user agent supports HTTP State Management it should persist, discard and send cookies (as received in the Set-Cookie response header, and sent in the Cookie header) as applicable.

How to reload a page using JavaScript

This works for me:

function refresh() {    
    setTimeout(function () {
        location.reload()
    }, 100);
}

http://jsfiddle.net/umerqureshi/znruyzop/

Most efficient conversion of ResultSet to JSON?

the other way , here I have used ArrayList and Map, so its not call json object row by row but after iteration of resultset finished :

 List<Map<String, String>> list = new ArrayList<Map<String, String>>();

  ResultSetMetaData rsMetaData = rs.getMetaData();  


      while(rs.next()){

              Map map = new HashMap();
              for (int i = 1; i <= rsMetaData.getColumnCount(); i++) {
                 String key = rsMetaData.getColumnName(i);

                  String value = null;

               if (rsmd.getColumnType(i) == java.sql.Types.VARCHAR) {
                           value = rs.getString(key);
               } else if(rsmd.getColumnType(i)==java.sql.Types.BIGINT)                         
                             value = rs.getLong(key);
               }                  


                    map.put(key, value);
              }
              list.add(map);


    }


     json.put(list);

View HTTP headers in Google Chrome?

I'm not sure about your exact version, but Chrome has a tab "Network" with several items and when I click on them I can see the headers on the right in a tab.

Press F12 on windows or ??I on a mac to bring up the Chrome developer tools.

WPF MVVM ComboBox SelectedItem or SelectedValue not working

I solved the problem by adding dispatcher in UserControl_Loaded event

 Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() =>
 {
     combobox.SelectedIndex = 0;
 }));

Programmatically add custom event in the iPhone Calendar

Working code in Swift-4.2

import UIKit
import EventKit
import EventKitUI

class yourViewController: UIViewController{

    let eventStore = EKEventStore()

    func addEventToCalendar() {

    eventStore.requestAccess( to: EKEntityType.event, completion:{(granted, error) in
        DispatchQueue.main.async {
            if (granted) && (error == nil) {
                let event = EKEvent(eventStore: self.eventStore)
                event.title = self.headerDescription
                event.startDate = self.parse(self.requestDetails.value(forKey: "session_time") as? String ?? "")
                event.endDate = self.parse(self.requestDetails.value(forKey: "session_end_time") as? String ?? "")
                let eventController = EKEventEditViewController()
                eventController.event = event
                eventController.eventStore = self.eventStore
                eventController.editViewDelegate = self
                self.present(eventController, animated: true, completion: nil)

            }
        }


       })
    }

}

Now we will get the event screen and here you can also modify your settings:

Now add delegate method to handle Cancel and add the event button action of event screen:

    extension viewController: EKEventEditViewDelegate {

    func eventEditViewController(_ controller: EKEventEditViewController, didCompleteWith action: EKEventEditViewAction) {
        controller.dismiss(animated: true, completion: nil)

    }
}

Note: Don't forget to add NSCalendarsUsageDescription key into info plist.

sql ORDER BY multiple values in specific order?

The CASE and ORDER BY suggestions should all work, but I'm going to suggest a horse of a different color. Assuming that there are only a reasonable number of values for x_field and you already know what they are, create an enumerated type with F, P, A, and I as the values (plus whatever other possible values apply). Enums will sort in the order implied by their CREATE statement. Also, you can use meaninful value names—your real application probably does and you have just masked them for confidentiality—without wasted space, since only the ordinal position is stored.

Automatically set appsettings.json for dev and release environments in asp.net core?

You may use conditional compilation:

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
    .SetBasePath(env.ContentRootPath)
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
#if SOME_BUILD_FLAG_A
    .AddJsonFile($"appsettings.flag_a.json", optional: true)
#else
    .AddJsonFile($"appsettings.no_flag_a.json", optional: true)
#endif
    .AddEnvironmentVariables();
    this.configuration = builder.Build();
}

Accessing an array out of bounds gives no error, why?

Hint

If you want to have fast constraint size arrays with range error check, try using boost::array, (also std::tr1::array from <tr1/array> it will be standard container in next C++ specification). It's much faster then std::vector. It reserve memory on heap or inside class instance, just like int array[].
This is simple sample code:

#include <iostream>
#include <boost/array.hpp>
int main()
{
    boost::array<int,2> array;
    array.at(0) = 1; // checking index is inside range
    array[1] = 2;    // no error check, as fast as int array[2];
    try
    {
       // index is inside range
       std::cout << "array.at(0) = " << array.at(0) << std::endl;

       // index is outside range, throwing exception
       std::cout << "array.at(2) = " << array.at(2) << std::endl; 

       // never comes here
       std::cout << "array.at(1) = " << array.at(1) << std::endl;  
    }
    catch(const std::out_of_range& r)
    {
        std::cout << "Something goes wrong: " << r.what() << std::endl;
    }
    return 0;
}

This program will print:

array.at(0) = 1
Something goes wrong: array<>: index out of range

Difference between no-cache and must-revalidate

With Jeffrey Fox's interpretation about no-cache, i've tested under chrome 52.0.2743.116 m, the result shows that no-cache has the same behavior as must-revalidate, they all will NOT use local cache when server is unreachable, and, they all will use cache while tap browser's Back/Forward button when server is unreachable. As above, i think max-age=0, must-revalidate is identical to no-cache, at least in implementation.

CSS override rules and specificity

The specificity is calculated based on the amount of id, class and tag selectors in your rule. Id has the highest specificity, then class, then tag. Your first rule is now more specific than the second one, since they both have a class selector, but the first one also has two tag selectors.

To make the second one override the first one, you can make more specific by adding information of it's parents:

table.rule1 tr td.rule2 {
    background-color: #ffff00;
}

Here is a nice article for more information on selector precedence.

Exception.Message vs Exception.ToString()

Exception.Message contains only the message (doh) associated with the exception. Example:

Object reference not set to an instance of an object

The Exception.ToString() method will give a much more verbose output, containing the exception type, the message (from before), a stack trace, and all of these things again for nested/inner exceptions. More precisely, the method returns the following:

ToString returns a representation of the current exception that is intended to be understood by humans. Where the exception contains culture-sensitive data, the string representation returned by ToString is required to take into account the current system culture. Although there are no exact requirements for the format of the returned string, it should attempt to reflect the value of the object as perceived by the user.

The default implementation of ToString obtains the name of the class that threw the current exception, the message, the result of calling ToString on the inner exception, and the result of calling Environment.StackTrace. If any of these members is a null reference (Nothing in Visual Basic), its value is not included in the returned string.

If there is no error message or if it is an empty string (""), then no error message is returned. The name of the inner exception and the stack trace are returned only if they are not a null reference (Nothing in Visual Basic).

Using Excel OleDb to get sheet names IN SHEET ORDER

Can't find this in actual MSDN documentation, but a moderator in the forums said

I am afraid that OLEDB does not preserve the sheet order as they were in Excel

Excel Sheet Names in Sheet Order

Seems like this would be a common enough requirement that there would be a decent workaround.

Add legend to ggplot2 line plot

Since @Etienne asked how to do this without melting the data (which in general is the preferred method, but I recognize there may be some cases where that is not possible), I present the following alternative.

Start with a subset of the original data:

datos <-
structure(list(fecha = structure(c(1317452400, 1317538800, 1317625200, 
1317711600, 1317798000, 1317884400, 1317970800, 1318057200, 1318143600, 
1318230000, 1318316400, 1318402800, 1318489200, 1318575600, 1318662000, 
1318748400, 1318834800, 1318921200, 1319007600, 1319094000), class = c("POSIXct", 
"POSIXt"), tzone = ""), TempMax = c(26.58, 27.78, 27.9, 27.44, 
30.9, 30.44, 27.57, 25.71, 25.98, 26.84, 33.58, 30.7, 31.3, 27.18, 
26.58, 26.18, 25.19, 24.19, 27.65, 23.92), TempMedia = c(22.88, 
22.87, 22.41, 21.63, 22.43, 22.29, 21.89, 20.52, 19.71, 20.73, 
23.51, 23.13, 22.95, 21.95, 21.91, 20.72, 20.45, 19.42, 19.97, 
19.61), TempMin = c(19.34, 19.14, 18.34, 17.49, 16.75, 16.75, 
16.88, 16.82, 14.82, 16.01, 16.88, 17.55, 16.75, 17.22, 19.01, 
16.95, 17.55, 15.21, 14.22, 16.42)), .Names = c("fecha", "TempMax", 
"TempMedia", "TempMin"), row.names = c(NA, 20L), class = "data.frame")

You can get the desired effect by (and this also cleans up the original plotting code):

ggplot(data = datos, aes(x = fecha)) +
  geom_line(aes(y = TempMax, colour = "TempMax")) +
  geom_line(aes(y = TempMedia, colour = "TempMedia")) +
  geom_line(aes(y = TempMin, colour = "TempMin")) +
  scale_colour_manual("", 
                      breaks = c("TempMax", "TempMedia", "TempMin"),
                      values = c("red", "green", "blue")) +
  xlab(" ") +
  scale_y_continuous("Temperatura (C)", limits = c(-10,40)) + 
  labs(title="TITULO")

The idea is that each line is given a color by mapping the colour aesthetic to a constant string. Choosing the string which is what you want to appear in the legend is the easiest. The fact that in this case it is the same as the name of the y variable being plotted is not significant; it could be any set of strings. It is very important that this is inside the aes call; you are creating a mapping to this "variable".

scale_colour_manual can now map these strings to the appropriate colors. The result is enter image description here

In some cases, the mapping between the levels and colors needs to be made explicit by naming the values in the manual scale (thanks to @DaveRGP for pointing this out):

ggplot(data = datos, aes(x = fecha)) +
  geom_line(aes(y = TempMax, colour = "TempMax")) +
  geom_line(aes(y = TempMedia, colour = "TempMedia")) +
  geom_line(aes(y = TempMin, colour = "TempMin")) +
  scale_colour_manual("", 
                      values = c("TempMedia"="green", "TempMax"="red", 
                                 "TempMin"="blue")) +
  xlab(" ") +
  scale_y_continuous("Temperatura (C)", limits = c(-10,40)) + 
  labs(title="TITULO")

(giving the same figure as before). With named values, the breaks can be used to set the order in the legend and any order can be used in the values.

ggplot(data = datos, aes(x = fecha)) +
  geom_line(aes(y = TempMax, colour = "TempMax")) +
  geom_line(aes(y = TempMedia, colour = "TempMedia")) +
  geom_line(aes(y = TempMin, colour = "TempMin")) +
  scale_colour_manual("", 
                      breaks = c("TempMedia", "TempMax", "TempMin"),
                      values = c("TempMedia"="green", "TempMax"="red", 
                                 "TempMin"="blue")) +
  xlab(" ") +
  scale_y_continuous("Temperatura (C)", limits = c(-10,40)) + 
  labs(title="TITULO")

What is the best way to compare 2 folder trees on windows?

Like the OP, I was looking for a Windows folder diff tool, in particular one that could handle very large trees (100s of Gigabytes of data). Thanks Lieven Keersmaekers for the pointer to BeyondCompare, which I found to be VERY fast (roughly 10-100 times faster) than my previous old school tool windiff.

BTW, BeyondCompare does have a command line mode in addition to the GUI.

How to write to file in Ruby?

To destroy the previous contents of the file, then write a new string to the file:

open('myfile.txt', 'w') { |f| f << "some text or data structures..." }

To append to a file without overwriting its old contents:

open('myfile.txt', "a") { |f| f << 'I am appended string' }

Load jQuery with Javascript and use jQuery

You need to run your code AFTER jQuery finished loading

var script = document.createElement('script'); 
document.head.appendChild(script);    
script.type = 'text/javascript';
script.src = "//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js";
script.onload = function(){
    // your jQuery code here
}

or if you're running it in an async function you could use await in the above code

var script = document.createElement('script'); 
document.head.appendChild(script);    
script.type = 'text/javascript';
script.src = "//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js";
await script.onload
// your jQuery code here

If you want to check first if jQuery already exists in the page, try this

How to Configure SSL for Amazon S3 bucket

You can access your files via SSL like this:

https://s3.amazonaws.com/bucket_name/images/logo.gif

If you use a custom domain for your bucket, you can use S3 and CloudFront together with your own SSL certificate (or generate a free one via Amazon Certificate Manager): http://aws.amazon.com/cloudfront/custom-ssl-domains/

Registering for Push Notifications in Xcode 8/Swift 3.0?

The answer from ast1 is very simple and useful. It works for me, thank you so much. I just want to poin it out here, so people who need this answer can find it easily. So, here is my code from registering local and remote (push) notification.

    //1. In Appdelegate: didFinishLaunchingWithOptions add these line of codes
    let mynotif = UNUserNotificationCenter.current()
    mynotif.requestAuthorization(options: [.alert, .sound, .badge]) {(granted, error) in }//register and ask user's permission for local notification

    //2. Add these functions at the bottom of your AppDelegate before the last "}"
    func application(_ application: UIApplication, didRegister notificationSettings: UNNotificationSettings) {
        application.registerForRemoteNotifications()//register for push notif after users granted their permission for showing notification
}
    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let tokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
    print("Device Token: \(tokenString)")//print device token in debugger console
}
    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("Failed to register: \(error)")//print error in debugger console
}

Composer: The requested PHP extension ext-intl * is missing from your system

To enable intl extension follow the instructions below.

You need enable extension by uncommenting the following line extension=php_intl.dll in the C:\xampp\php\php.ini file. Once you uncomment the extension=php_intl.dll, then you must restart apache server using XAMPP control panel.

//about line 998
;extension=php_intl.dll 
change as
extension=php_intl.dll

(Note: php.ini file mostly in the following directory C:\xampp\php)

Restart xampp

RecyclerView inside ScrollView is not working

For ScrollView, you could use fillViewport=true and make layout_height="match_parent" as below and put recycler view inside:

<ScrollView
    android:fillViewport="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/llOptions">
          <android.support.v7.widget.RecyclerView
            android:id="@+id/rvList"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
</ScrollView>

No further height adjustment needed through code.

Return value in a Bash function

Another way to achive this is name references (requires Bash 4.3+).

function example {
  local -n VAR=$1
  VAR=foo
}

example RESULT
echo $RESULT

How to set combobox default value?

Suppose you bound your combobox to a List<Person>

List<Person> pp = new List<Person>();
pp.Add(new Person() {id = 1, name="Steve"});
pp.Add(new Person() {id = 2, name="Mark"});
pp.Add(new Person() {id = 3, name="Charles"});

cbo1.DisplayMember = "name";
cbo1.ValueMember = "id";
cbo1.DataSource = pp;

At this point you cannot set the Text property as you like, but instead you need to add an item to your list before setting the datasource

pp.Insert(0, new Person() {id=-1, name="--SELECT--"});
cbo1.DisplayMember = "name";
cbo1.ValueMember = "id";
cbo1.DataSource = pp;
cbo1.SelectedIndex = 0;

Of course this means that you need to add a checking code when you try to use the info from the combobox

if(cbo1.SelectedValue != null && Convert.ToInt32(cbo1.SelectedValue) == -1)
    MessageBox.Show("Please select a person name");
else
    ......

The code is the same if you use a DataTable instead of a list. You need to add a fake row at the first position of the Rows collection of the datatable and set the initial index of the combobox to make things clear. The only thing you need to look at are the name of the datatable columns and which columns should contain a non null value before adding the row to the collection

In a table with three columns like ID, FirstName, LastName with ID,FirstName and LastName required you need to

DataRow row = datatable.NewRow();
row["ID"] = -1;
row["FirstName"] = "--Select--";    
row["LastName"] = "FakeAddress";
dataTable.Rows.InsertAt(row, 0);

Why doesn't Git ignore my specified file?

What I did it to ignore the settings.php file successfully:

git rm --cached sites/default/settings.php
commit (up to here didn't work)
manually deleted sites/default/settings.php (this did the trick)
git add .
commit (ignored successfully)

I think if there's the committed file on Git then ignore doesn't work as expected. Just delete the file and commit. Afterwards it'll ignore.

Find unused npm packages in package.json

If you're using a Unix like OS (Linux, OSX, etc) then you can use a combination of find and egrep to search for require statements containing your package name:

find . -path ./node_modules -prune -o -name "*.js" -exec egrep -ni 'name-of-package' {} \;

If you search for the entire require('name-of-package') statement, remember to use the correct type of quotation marks:

find . -path ./node_modules -prune -o -name "*.js" -exec egrep -ni 'require("name-of-package")' {} \;

find . -path ./node_modules -prune -o -name "*.js" -exec egrep -ni "require('name-of-package')" {} \;

The downside is that it's not fully automatic, i.e. it doesn't extract package names from package.json and check them. You need to do this for each package yourself. Since package.json is just JSON this could be remedied by writing a small script that uses child_process.exec to run this command for each dependency. And make it a module. And add it to the NPM repo...

init() got an unexpected keyword argument 'user'

Check your imports. There could be two classes with the same name. Either from your code or from a library you are using. Personally that was the issue.

CKEditor instance already exists

Its pretty simple. In my case, I ran the below jquery method that will destroy ckeditor instances during a page load. This did the trick and resolved the issue -

JQuery method -

function resetCkEditorsOnLoad(){

    for(var i in CKEDITOR.instances) {
        editor = CKEDITOR.instances[i];
            editor.destroy();
            editor = null;
    }
}

$(function() {

            $(".form-button").button();
    $(".button").button();

    resetCkEditorsOnLoad(); // CALLING THE METHOD DURING THE PAGE LOAD

            .... blah.. blah.. blah.... // REST OF YOUR BUSINESS LOGIC GOES HERE

       });

That's it. I hope it helps you.

Cheers, Sirish.

How to make GREP select only numeric values?

If you try:

 echo "99%" |grep -o '[0-9]*'

It returns:

Here's the details on the -o (or --only-matching flag) works from the grep manual page.

Print only the matched (non-empty) parts of matching lines, with each such part on a separate output line. Output lines use the same delimiters as input, and delimiters are null bytes if -z (--null-data) is also used (see Other Options).

Use string.Contains() with switch()

Some custom swtich can be created like this. Allows multiple case execution as well

public class ContainsSwitch
{

    List<ContainsSwitch> actionList = new List<ContainsSwitch>();
    public string Value { get; set; }
    public Action Action { get; set; }
    public bool SingleCaseExecution { get; set; }
    public void Perform( string target)
    {
        foreach (ContainsSwitch act in actionList)
        {
            if (target.Contains(act.Value))
            {
                act.Action();
                if(SingleCaseExecution)
                    break;
            }
        }
    }
    public void AddCase(string value, Action act)
    {
        actionList.Add(new ContainsSwitch() { Action = act, Value = value });
    }
}

Call like this

string m = "abc";
ContainsSwitch switchAction = new ContainsSwitch();
switchAction.SingleCaseExecution = true;
switchAction.AddCase("a", delegate() { Console.WriteLine("matched a"); });
switchAction.AddCase("d", delegate() { Console.WriteLine("matched d"); });
switchAction.AddCase("a", delegate() { Console.WriteLine("matched a"); });

switchAction.Perform(m);

AWS Lambda import module error in python

I ran into the same issue, this was an exercise as part of a tutorial on lynda.com if I'm not wrong. The mistake I made was not selecting the runtime as Python 3.6 which is an option in the lamda function console.

Using ExcelDataReader to read Excel data starting from a particular cell

If you are using ExcelDataReader 3+ you will find that there isn't any method for AsDataSet() for your reader object, You need to also install another package for ExcelDataReader.DataSet, then you can use the AsDataSet() method.
Also there is not a property for IsFirstRowAsColumnNames instead you need to set it inside of ExcelDataSetConfiguration.

Example:

using (var stream = File.Open(originalFileName, FileMode.Open, FileAccess.Read))
{
    IExcelDataReader reader;

    // Create Reader - old until 3.4+
    ////var file = new FileInfo(originalFileName);
    ////if (file.Extension.Equals(".xls"))
    ////    reader = ExcelDataReader.ExcelReaderFactory.CreateBinaryReader(stream);
    ////else if (file.Extension.Equals(".xlsx"))
    ////    reader = ExcelDataReader.ExcelReaderFactory.CreateOpenXmlReader(stream);
    ////else
    ////    throw new Exception("Invalid FileName");
    // Or in 3.4+ you can only call this:
    reader = ExcelDataReader.ExcelReaderFactory.CreateReader(stream)

    //// reader.IsFirstRowAsColumnNames
    var conf = new ExcelDataSetConfiguration
    {
        ConfigureDataTable = _ => new ExcelDataTableConfiguration
        {
            UseHeaderRow = true 
        }
    };

    var dataSet = reader.AsDataSet(conf);

    // Now you can get data from each sheet by its index or its "name"
    var dataTable = dataSet.Tables[0];

    //...
}

You can find row number and column number of a cell reference like this:

var cellStr = "AB2"; // var cellStr = "A1";
var match = Regex.Match(cellStr, @"(?<col>[A-Z]+)(?<row>\d+)");
var colStr = match.Groups["col"].ToString();
var col = colStr.Select((t, i) => (colStr[i] - 64) * Math.Pow(26, colStr.Length - i - 1)).Sum();
var row = int.Parse(match.Groups["row"].ToString());

Now you can use some loops to read data from that cell like this:

for (var i = row; i < dataTable.Rows.Count; i++)
{
    for (var j = col; j < dataTable.Columns.Count; j++)
    {
        var data = dataTable.Rows[i][j];
    }
}

Update:

You can filter rows and columns of your Excel sheet at read time with this config:

var i = 0;
var conf = new ExcelDataSetConfiguration
{
    UseColumnDataType = true,
    ConfigureDataTable = _ => new ExcelDataTableConfiguration
    {
        FilterRow = rowReader => fromRow <= ++i - 1,
        FilterColumn = (rowReader, colIndex) => fromCol <= colIndex,
        UseHeaderRow = true
    }
};

Angular JS Uncaught Error: [$injector:modulerr]

Try adding this:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.7/angular-resource.min.js"></script>

What's the shebang/hashbang (#!) in Facebook and new Twitter URLs for?

This technique is now deprecated.

This used to tell Google how to index the page.

https://developers.google.com/webmasters/ajax-crawling/

This technique has mostly been supplanted by the ability to use the JavaScript History API that was introduced alongside HTML5. For a URL like www.example.com/ajax.html#!key=value, Google will check the URL www.example.com/ajax.html?_escaped_fragment_=key=value to fetch a non-AJAX version of the contents.

add controls vertically instead of horizontally using flow layout

I used a BoxLayout and set its second parameter as BoxLayout.Y_AXIS and it worked for me:

panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

jQuery animated number counter from zero to value

IMPORTANT: It seems like a small difference but you should really use a data attribute to hold the original number to count up to. Altering the original number can have un-intended consequences. For instance, I'm having this animation run everytime an element enters the screen. But if the element enters, exits, and then enters the screen a second time before the first animation finishes, it will count up to the wrong number.

HTML:

<p class="count" data-value="200" >200</p>
<p class="count" data-value="70" >70</p>
<p class="count" data-value="32" >32</p>

JQuery:

$('.count').each(function () {
    $(this).prop('Counter', 0).animate({
            Counter: $(this).data('value')
        }, {
        duration: 1000,
        easing: 'swing',
        step: function (now) {                      
            $(this).text(this.Counter.toFixed(2));
        }
    });
});

How to convert md5 string to normal text?

The idea of MD5 is that is a one-way hashing, so it can't be once the original value has been passed through the hashing algorithm (if at all).

You could (potentially) create a database table with a pairing of the original and the MD5 values but I guess that's highly impractical and poses a major security risk.

How to convert a string to lower or upper case in Ruby

Since Ruby 2.4 there is a built in full Unicode case mapping. Source: https://stackoverflow.com/a/38016153/888294. See Ruby 2.4.0 documentation for details: https://ruby-doc.org/core-2.4.0/String.html#method-i-downcase

Check if at least two out of three booleans are true

It should be:

(a || b && c) && (b || c && a)

Also, if true is automatically converted to 1 and false to 0:

(a + b*c) * (b + c*a) > 0

T-SQL split string based on delimiter

For those looking for answers for SQL Server 2016+. Use the built-in STRING_SPLIT function

Eg:

DECLARE @tags NVARCHAR(400) = 'clothing,road,,touring,bike'  

SELECT value  
FROM STRING_SPLIT(@tags, ',')  
WHERE RTRIM(value) <> '';

Reference: https://msdn.microsoft.com/en-nz/library/mt684588.aspx

Delete all records in a table of MYSQL in phpMyAdmin

Visit phpmyadmin
Select your database and click on structure
In front of your table, you can see Empty, click on it to clear all the entries from the selected table.

Or you can do the same using sql query:

Click on SQL present along side Structure

TRUNCATE tablename; //offers better performance, but used only when all entries need to be cleared
or
DELETE FROM tablename; //returns the number of rows deleted

Refer to DELETE and TRUNCATE for detailed documentaion

Trying Gradle build - "Task 'build' not found in root project"

Check your file: settings.gradle for presence lines with included subprojects (for example: include chapter1-bookstore )

How to call a JavaScript function within an HTML body

Just to clarify things, you don't/can't "execute it within the HTML body".

You can modify the contents of the HTML using javascript.

You decide at what point you want the javascript to be executed.

For example, here is the contents of a html file, including javascript, that does what you want.

<html>
  <head>
    <script>
    // The next line document.addEventListener....
    // tells the browser to execute the javascript in the function after
    // the DOMContentLoaded event is complete, i.e. the browser has
    // finished loading the full webpage
    document.addEventListener("DOMContentLoaded", function(event) { 
      var col1 = ["Full time student checking (Age 22 and under) ", "Customers over age 65", "Below  $500.00" ];
      var col2 = ["None", "None", "$8.00"];
      var TheInnerHTML ="";
      for (var j = 0; j < col1.length; j++) {
        TheInnerHTML += "<tr><td>"+col1[j]+"</td><td>"+col2[j]+"</td></tr>";
    }
    document.getElementById("TheBody").innerHTML = TheInnerHTML;});
    </script>
  </head>
  <body>
    <table>
    <thead>
      <tr>
        <th>Balance</th>
        <th>Fee</th>        
      </tr>
    </thead>
    <tbody id="TheBody">
    </tbody>
  </table>
</body>

Enjoy !

How can I display a pdf document into a Webview?

Here load with progressDialog. Need to give WebClient otherwise it force to open in browser:

final ProgressDialog pDialog = new ProgressDialog(context);
    pDialog.setTitle(context.getString(R.string.app_name));
    pDialog.setMessage("Loading...");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(false);
    WebView webView = (WebView) rootView.findViewById(R.id.web_view);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            pDialog.show();
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            pDialog.dismiss();
        }
    });
    String pdf = "http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf";
    webView.loadUrl("https://drive.google.com/viewerng/viewer?embedded=true&url=" + pdf);

Meaning of numbers in "col-md-4"," col-xs-1", "col-lg-2" in Bootstrap

Here you go

col-lg-2 : if the screen is large (lg) then this component will take space of 2 elements considering entire row can fit 12 elements ( so you will see that on large screen this component takes 16% space of a row)

col-lg-6 : if the screen is large (lg) then this component will take space of 6 elements considering entire row can fit 12 elements -- when applied you will see that the component has taken half the available space in the row.

Above rule is only applied when the screen is large. when the screen is small this rule is discarded and only one component per row is shown.

Below image shows various screen size widths :

String format currency

Personally i'm against using culture specific code, i suggest doing:

@String.Format(CultureInfo.CurrentCulture, "{0:C}", @price)

and in your web.config do:

<system.web>
    <globalization culture="en-GB" uiCulture="en-US" />
</system.web>

Additional info: https://msdn.microsoft.com/en-us/library/syy068tk(v=vs.90).aspx

Using C# to read/write Excel files (.xls/.xlsx)

I'm a big fan of using EPPlus to perform these types of actions. EPPlus is a library you can reference in your project and easily create/modify spreadsheets on a server. I use it for any project that requires an export function.

Here's a nice blog entry that shows how to use the library, though the library itself should come with some samples that explain how to use it.

Third party libraries are a lot easier to use than Microsoft COM objects, in my opinion. I would suggest giving it a try.

printf format specifiers for uint32_t and size_t

All that's needed is that the format specifiers and the types agree, and you can always cast to make that true. long is at least 32 bits, so %lu together with (unsigned long)k is always correct:

uint32_t k;
printf("%lu\n", (unsigned long)k);

size_t is trickier, which is why %zu was added in C99. If you can't use that, then treat it just like k (long is the biggest type in C89, size_t is very unlikely to be larger).

size_t sz;
printf("%zu\n", sz);  /* C99 version */
printf("%lu\n", (unsigned long)sz);  /* common C89 version */

If you don't get the format specifiers correct for the type you are passing, then printf will do the equivalent of reading too much or too little memory out of the array. As long as you use explicit casts to match up types, it's portable.

Programmatically set left drawable in a TextView

static private Drawable **scaleDrawable**(Drawable drawable, int width, int height) {

    int wi = drawable.getIntrinsicWidth();
    int hi = drawable.getIntrinsicHeight();
    int dimDiff = Math.abs(wi - width) - Math.abs(hi - height);
    float scale = (dimDiff > 0) ? width / (float)wi : height /
            (float)hi;
    Rect bounds = new Rect(0, 0, (int)(scale * wi), (int)(scale * hi));
    drawable.setBounds(bounds);
    return drawable;
}

Android Studio don't generate R.java for my import project

I managed to regenerate R: File->Settings->Compiler

then UNCHECK "Use in-process build"

Rebuild Project

Find Facebook user (url to profile page) by known email address

Maybe this is a little bit late but I found a web site which gives social media account details by know email addreess. It is https://www.fullcontact.com

You can use Person Api there and get the info.

This is a type of get : https://api.fullcontact.com/v2/person.xml?email=someone@****&apiKey=********

Also there is xml or json choice.

Convert HTML to PDF in .NET

PDFmyURL recently released a .NET component for web page / HTML to PDF conversion as well. This has a very user friendly interface, for example:

PDFmyURL pdf = new PDFmyURL("yourlicensekey");
pdf.ConvertURL("http://www.example.com", Application.StartupPath + @"\example.pdf");

Documentation: PDFmyURL .NET component documentation

Disclaimer: I work for the company that owns PDFmyURL

Changing the position of Bootstrap popovers based on the popover's X position in relation to window edge?

You can use auto in data placement like data-placement="auto left". It will automatic adjust according to your screen size and default placement will be left.

Disable vertical scroll bar on div overflow: auto

How about a shorthand notation?

{overflow: auto hidden;}

How to detect tableView cell touched or clicked in swift

This worked good for me:

_x000D_

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {_x000D_
        print("section: \(indexPath.section)")_x000D_
        print("row: \(indexPath.row)")_x000D_
    }

_x000D_

The output should be:

section: 0
row: 0

Resolving IP Address from hostname with PowerShell

You can use this code if you have a bunch of hosts in text file

$a = get-content "C:\Users\host.txt"(file path) 

foreach ($i in $a )
    {
$i + "`n" + "==========================";[System.Net.Dns]::GetHostAddresses($i) 

}

What is the default database path for MongoDB?

For a Windows machine start the mongod process by specifying the dbpath:

mongod --dbpath \mongodb\data

Reference: Manage mongod Processes

CMD what does /im (taskkill)?

If you type the executable name and a /? switch at the command line, there is typically help information available. Doing so with taskkill /? provides the following, for instance:

TASKKILL [/S system [/U username [/P [password]]]]
         { [/FI filter] [/PID processid | /IM imagename] } [/T] [/F]

Description:
    This tool is used to terminate tasks by process id (PID) or image name.

Parameter List:
    /S    system           Specifies the remote system to connect to.

    /U    [domain\]user    Specifies the user context under which the
                           command should execute.

    /P    [password]       Specifies the password for the given user
                           context. Prompts for input if omitted.

    /FI   filter           Applies a filter to select a set of tasks.
                           Allows "*" to be used. ex. imagename eq acme*

    /PID  processid        Specifies the PID of the process to be terminated.
                           Use TaskList to get the PID.

    /IM   imagename        Specifies the image name of the process
                           to be terminated. Wildcard '*' can be used
                           to specify all tasks or image names.

    /T                     Terminates the specified process and any
                           child processes which were started by it.

    /F                     Specifies to forcefully terminate the process(es).

    /?                     Displays this help message.

Filters:
    Filter Name   Valid Operators           Valid Value(s)
    -----------   ---------------           -------------------------
    STATUS        eq, ne                    RUNNING |
                                            NOT RESPONDING | UNKNOWN
    IMAGENAME     eq, ne                    Image name
    PID           eq, ne, gt, lt, ge, le    PID value
    SESSION       eq, ne, gt, lt, ge, le    Session number.
    CPUTIME       eq, ne, gt, lt, ge, le    CPU time in the format
                                            of hh:mm:ss.
                                            hh - hours,
                                            mm - minutes, ss - seconds
    MEMUSAGE      eq, ne, gt, lt, ge, le    Memory usage in KB
    USERNAME      eq, ne                    User name in [domain\]user
                                            format
    MODULES       eq, ne                    DLL name
    SERVICES      eq, ne                    Service name
    WINDOWTITLE   eq, ne                    Window title

    NOTE
    ----
    1) Wildcard '*' for /IM switch is accepted only when a filter is applied.
    2) Termination of remote processes will always be done forcefully (/F).
    3) "WINDOWTITLE" and "STATUS" filters are not considered when a remote
       machine is specified.

Examples:
    TASKKILL /IM notepad.exe
    TASKKILL /PID 1230 /PID 1241 /PID 1253 /T
    TASKKILL /F /IM cmd.exe /T 
    TASKKILL /F /FI "PID ge 1000" /FI "WINDOWTITLE ne untitle*"
    TASKKILL /F /FI "USERNAME eq NT AUTHORITY\SYSTEM" /IM notepad.exe
    TASKKILL /S system /U domain\username /FI "USERNAME ne NT*" /IM *
    TASKKILL /S system /U username /P password /FI "IMAGENAME eq note*"

You can also find this information, as well as documentation for most of the other command-line utilities, in the Microsoft TechNet Command-Line Reference

Using openssl to get the certificate from a server

If your server is an email server (MS Exchange or Zimbra) maybe you need to add the starttls and smtp flags:

openssl s_client -starttls smtp -connect HOST_EMAIL:SECURE_PORT 2>/dev/null </dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > CERTIFICATE_NAME.pem

Where,

HOST_EMAIL is the server domain, for example, mail-server.com.
SECURE_PORT is the communication port, for example, 587 or 465
CERTIFICATE_NAME output's filename (BASE 64/PEM Format)

Android Studio how to run gradle sync manually?

Shortcut (Ubuntu, Windows):

Ctrl + F5

Will sync the project with Gradle files.

How to limit the number of selected checkboxes?

$("input:checkbox").click(function(){
    if ($("input:checkbox:checked").length > 3){
      return false;
   }
});

Is it possible to have SSL certificate for IP address, not domain name?

Yep. Cloudflare uses it for its DNS instructions homepage: https://1.1.1.1

display HTML page after loading complete

put an overlay on the page

#loading-mask {
    background-color: white;
    height: 100%;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 9999;
}

and then delete that element in a window.onload handler or, hide it

window.onload=function() {
    document.getElementById('loading-mask').style.display='none';
}

Of course you should use your javascript library (jquery,prototype..) specific onload handler if you are using a library.

u'\ufeff' in Python string

Here is based on the answer from Mark Tolonen. The string included different languages of the word 'test' that's separated by '|', so you can see the difference.

u = u'ABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'
e8 = u.encode('utf-8')        # encode without BOM
e8s = u.encode('utf-8-sig')   # encode with BOM
e16 = u.encode('utf-16')      # encode with BOM
e16le = u.encode('utf-16le')  # encode without BOM
e16be = u.encode('utf-16be')  # encode without BOM
print('utf-8     %r' % e8)
print('utf-8-sig %r' % e8s)
print('utf-16    %r' % e16)
print('utf-16le  %r' % e16le)
print('utf-16be  %r' % e16be)
print()
print('utf-8  w/ BOM decoded with utf-8     %r' % e8s.decode('utf-8'))
print('utf-8  w/ BOM decoded with utf-8-sig %r' % e8s.decode('utf-8-sig'))
print('utf-16 w/ BOM decoded with utf-16    %r' % e16.decode('utf-16'))
print('utf-16 w/ BOM decoded with utf-16le  %r' % e16.decode('utf-16le'))

Here is a test run:

>>> u = u'ABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'
>>> e8 = u.encode('utf-8')        # encode without BOM
>>> e8s = u.encode('utf-8-sig')   # encode with BOM
>>> e16 = u.encode('utf-16')      # encode with BOM
>>> e16le = u.encode('utf-16le')  # encode without BOM
>>> e16be = u.encode('utf-16be')  # encode without BOM
>>> print('utf-8     %r' % e8)
utf-8     b'ABCtest\xce\xb2\xe8\xb2\x9d\xe5\xa1\x94\xec\x9c\x84m\xc3\xa1sb\xc3\xaata|test|\xd8\xa7\xd8\xae\xd8\xaa\xd8\xa8\xd8\xa7\xd8\xb1|\xe6\xb5\x8b\xe8\xaf\x95|\xe6\xb8\xac\xe8\xa9\xa6|\xe3\x83\x86\xe3\x82\xb9\xe3\x83\x88|\xe0\xa4\xaa\xe0\xa4\xb0\xe0\xa5\x80\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xb7\xe0\xa4\xbe|\xe0\xb4\xaa\xe0\xb4\xb0\xe0\xb4\xbf\xe0\xb4\xb6\xe0\xb5\x8b\xe0\xb4\xa7\xe0\xb4\xa8|\xd7\xa4\xd6\xbc\xd7\xa8\xd7\x95\xd7\x91\xd7\x99\xd7\xa8\xd7\x9f|ki\xe1\xbb\x83m tra|\xc3\x96l\xc3\xa7ek|'
>>> print('utf-8-sig %r' % e8s)
utf-8-sig b'\xef\xbb\xbfABCtest\xce\xb2\xe8\xb2\x9d\xe5\xa1\x94\xec\x9c\x84m\xc3\xa1sb\xc3\xaata|test|\xd8\xa7\xd8\xae\xd8\xaa\xd8\xa8\xd8\xa7\xd8\xb1|\xe6\xb5\x8b\xe8\xaf\x95|\xe6\xb8\xac\xe8\xa9\xa6|\xe3\x83\x86\xe3\x82\xb9\xe3\x83\x88|\xe0\xa4\xaa\xe0\xa4\xb0\xe0\xa5\x80\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xb7\xe0\xa4\xbe|\xe0\xb4\xaa\xe0\xb4\xb0\xe0\xb4\xbf\xe0\xb4\xb6\xe0\xb5\x8b\xe0\xb4\xa7\xe0\xb4\xa8|\xd7\xa4\xd6\xbc\xd7\xa8\xd7\x95\xd7\x91\xd7\x99\xd7\xa8\xd7\x9f|ki\xe1\xbb\x83m tra|\xc3\x96l\xc3\xa7ek|'
>>> print('utf-16    %r' % e16)
utf-16    b"\xff\xfeA\x00B\x00C\x00t\x00e\x00s\x00t\x00\xb2\x03\x9d\x8cTX\x04\xc7m\x00\xe1\x00s\x00b\x00\xea\x00t\x00a\x00|\x00t\x00e\x00s\x00t\x00|\x00'\x06.\x06*\x06(\x06'\x061\x06|\x00Km\xd5\x8b|\x00,nf\x8a|\x00\xc60\xb90\xc80|\x00*\t0\t@\t\x15\tM\t7\t>\t|\x00*\r0\r?\r6\rK\r'\r(\r|\x00\xe4\x05\xbc\x05\xe8\x05\xd5\x05\xd1\x05\xd9\x05\xe8\x05\xdf\x05|\x00k\x00i\x00\xc3\x1em\x00 \x00t\x00r\x00a\x00|\x00\xd6\x00l\x00\xe7\x00e\x00k\x00|\x00"
>>> print('utf-16le  %r' % e16le)
utf-16le  b"A\x00B\x00C\x00t\x00e\x00s\x00t\x00\xb2\x03\x9d\x8cTX\x04\xc7m\x00\xe1\x00s\x00b\x00\xea\x00t\x00a\x00|\x00t\x00e\x00s\x00t\x00|\x00'\x06.\x06*\x06(\x06'\x061\x06|\x00Km\xd5\x8b|\x00,nf\x8a|\x00\xc60\xb90\xc80|\x00*\t0\t@\t\x15\tM\t7\t>\t|\x00*\r0\r?\r6\rK\r'\r(\r|\x00\xe4\x05\xbc\x05\xe8\x05\xd5\x05\xd1\x05\xd9\x05\xe8\x05\xdf\x05|\x00k\x00i\x00\xc3\x1em\x00 \x00t\x00r\x00a\x00|\x00\xd6\x00l\x00\xe7\x00e\x00k\x00|\x00"
>>> print('utf-16be  %r' % e16be)
utf-16be  b"\x00A\x00B\x00C\x00t\x00e\x00s\x00t\x03\xb2\x8c\x9dXT\xc7\x04\x00m\x00\xe1\x00s\x00b\x00\xea\x00t\x00a\x00|\x00t\x00e\x00s\x00t\x00|\x06'\x06.\x06*\x06(\x06'\x061\x00|mK\x8b\xd5\x00|n,\x8af\x00|0\xc60\xb90\xc8\x00|\t*\t0\t@\t\x15\tM\t7\t>\x00|\r*\r0\r?\r6\rK\r'\r(\x00|\x05\xe4\x05\xbc\x05\xe8\x05\xd5\x05\xd1\x05\xd9\x05\xe8\x05\xdf\x00|\x00k\x00i\x1e\xc3\x00m\x00 \x00t\x00r\x00a\x00|\x00\xd6\x00l\x00\xe7\x00e\x00k\x00|"
>>> print()

>>> print('utf-8  w/ BOM decoded with utf-8     %r' % e8s.decode('utf-8'))
utf-8  w/ BOM decoded with utf-8     '\ufeffABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'
>>> print('utf-8  w/ BOM decoded with utf-8-sig %r' % e8s.decode('utf-8-sig'))
utf-8  w/ BOM decoded with utf-8-sig 'ABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'
>>> print('utf-16 w/ BOM decoded with utf-16    %r' % e16.decode('utf-16'))
utf-16 w/ BOM decoded with utf-16    'ABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'
>>> print('utf-16 w/ BOM decoded with utf-16le  %r' % e16.decode('utf-16le'))
utf-16 w/ BOM decoded with utf-16le  '\ufeffABCtestß???másbêta|test|??????|??|??|???|???????|???????|????????|ki?m tra|Ölçek|'

It's worth to know that only both utf-8-sig and utf-16 get back the original string after both encode and decode.

get url content PHP

Use cURL,

Check if you have it via phpinfo();

And for the code:

function getHtml($url, $post = null) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    if(!empty($post)) {
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    } 
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

The provided URI scheme 'https' is invalid; expected 'http'. Parameter name: via

Try adding message credentials on your app.config like:

<bindings> 
<basicHttpBinding> 
<binding name="defaultBasicHttpBinding"> 
  <security mode="Transport"> 
    <transport clientCredentialType="None" proxyCredentialType="None" realm=""/> 
    <message clientCredentialType="Certificate" algorithmSuite="Default" />
  </security> 
</binding> 
</basicHttpBinding> 
</bindings>

How to check if a file exists in Go?

The example by user11617 is incorrect; it will report that the file exists even in cases where it does not, but there was an error of some other sort.

The signature should be Exists(string) (bool, error). And then, as it happens, the call sites are no better.

The code he wrote would better as:

func Exists(name string) bool {
    _, err := os.Stat(name)
    return !os.IsNotExist(err)
}

But I suggest this instead:

func Exists(name string) (bool, error) {
  _, err := os.Stat(name)
  if os.IsNotExist(err) {
    return false, nil
  }
  return err != nil, err
}

Scale image to fit a bounding box

html:

    <div class="container">
      <img class="flowerImg" src="flower.jpg">
    </div>

css:

.container{
  width: 100px;
  height: 100px;
}


.flowerImg{
  width: 100px;
  height: 100px;
  object-fit: cover;
  /*object-fit: contain;
  object-fit: scale-down;
  object-position: -10% 0;
  object-fit: none;
  object-fit: fill;*/
}

How to create a numpy array of all True or all False?

numpy already allows the creation of arrays of all ones or all zeros very easily:

e.g. numpy.ones((2, 2)) or numpy.zeros((2, 2))

Since True and False are represented in Python as 1 and 0, respectively, we have only to specify this array should be boolean using the optional dtype parameter and we are done.

numpy.ones((2, 2), dtype=bool)

returns:

array([[ True,  True],
       [ True,  True]], dtype=bool)

UPDATE: 30 October 2013

Since numpy version 1.8, we can use full to achieve the same result with syntax that more clearly shows our intent (as fmonegaglia points out):

numpy.full((2, 2), True, dtype=bool)

UPDATE: 16 January 2017

Since at least numpy version 1.12, full automatically casts results to the dtype of the second parameter, so we can just write:

numpy.full((2, 2), True)

How to check if a function exists on a SQL database

I've found you can use a very non verbose and straightforward approach to checking for the existence various SQL Server objects this way:

IF OBJECTPROPERTY (object_id('schemaname.scalarfuncname'), 'IsScalarFunction') = 1
IF OBJECTPROPERTY (object_id('schemaname.tablefuncname'), 'IsTableFunction') = 1
IF OBJECTPROPERTY (object_id('schemaname.procname'), 'IsProcedure') = 1

This is based on the OBJECTPROPERTY function which is available in SQL 2005+. The MSDN article can be found here.

The OBJECTPROPERTY function uses the following signature:

OBJECTPROPERTY ( id , property )

You pass a literal value into the property parameter, designating the type of object you are looking for. There's a massive list of values you can supply.

jQuery position DIV fixed at top on scroll

instead of doing it like that, why not just make the flyout position:fixed, top:0; left:0; once your window has scrolled pass a certain height:

jQuery

  $(window).scroll(function(){
      if ($(this).scrollTop() > 135) {
          $('#task_flyout').addClass('fixed');
      } else {
          $('#task_flyout').removeClass('fixed');
      }
  });

css

.fixed {position:fixed; top:0; left:0;}

Example

date() method, "A non well formed numeric value encountered" does not want to format a date passed in $_POST

From the documentation for strtotime():

Dates in the m/d/y or d-m-y formats are disambiguated by looking at the separator between the various components: if the separator is a slash (/), then the American m/d/y is assumed; whereas if the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed.

In your date string, you have 12-16-2013. 16 isn't a valid month, and hence strtotime() returns false.

Since you can't use DateTime class, you could manually replace the - with / using str_replace() to convert the date string into a format that strtotime() understands:

$date = '2-16-2013';
echo date('Y-m-d', strtotime(str_replace('-','/', $date))); // => 2013-02-16

How do I print output in new line in PL/SQL?

  begin

        dbms_output.put_line('Hi, '||CHR(10)|| 'good'||CHR(10)|| 'morning' ||CHR(10)|| 'friends');

    end;

Set QLineEdit to accept only numbers

If you're using QT Creator 5.6 you can do that like this:

#include <QIntValidator>

ui->myLineEditName->setValidator( new QIntValidator);

I recomend you put that line after ui->setupUi(this);

I hope this helps.

How do I block or restrict special characters from input fields with jquery?

this is an example that prevent the user from typing the character "a"

$(function() {
$('input:text').keydown(function(e) {
if(e.keyCode==65)
    return false;

});
});

key codes refrence here:
http://www.expandinghead.net/keycode.html

Does HTTP use UDP?

From RFC 2616:

HTTP communication usually takes place over TCP/IP connections. The default port is TCP 80, but other ports can be used. This does not preclude HTTP from being implemented on top of any other protocol on the Internet, or on other networks. HTTP only presumes a reliable transport; any protocol that provides such guarantees can be used; the mapping of the HTTP/1.1 request and response structures onto the transport data units of the protocol in question is outside the scope of this specification.

So although it doesn't explicitly say so, UDP is not used because it is not a "reliable transport".

EDIT - more recently, the QUIC protocol (which is more strictly a pseudo-transport or a session layer protocol) does use UDP for carrying HTTP/2.0 traffic and much of Google's traffic already uses this protocol. It's currently progressing towards standardisation as HTTP/3.

How do I pass the this context to a function?

Javascripts .call() and .apply() methods allow you to set the context for a function.

var myfunc = function(){
    alert(this.name);
};

var obj_a = {
    name:  "FOO"
};

var obj_b = {
    name:  "BAR!!"
};

Now you can call:

myfunc.call(obj_a);

Which would alert FOO. The other way around, passing obj_b would alert BAR!!. The difference between .call() and .apply() is that .call() takes a comma separated list if you're passing arguments to your function and .apply() needs an array.

myfunc.call(obj_a, 1, 2, 3);
myfunc.apply(obj_a, [1, 2, 3]);

Therefore, you can easily write a function hook by using the apply() method. For instance, we want to add a feature to jQuerys .css() method. We can store the original function reference, overwrite the function with custom code and call the stored function.

var _css = $.fn.css;
$.fn.css = function(){
   alert('hooked!');
   _css.apply(this, arguments);
};

Since the magic arguments object is an array like object, we can just pass it to apply(). That way we guarantee, that all parameters are passed through to the original function.

'True' and 'False' in Python

is compares identity. A string will never be identical to a not-string.

== is equality. But a string will never be equal to either True or False.

You want neither.

path = '/bla/bla/bla'

if path:
    print "True"
else:
    print "False"

ssl_error_rx_record_too_long and Apache SSL

Old question, but first result in Google for me, so here's what I had to do.

Ubuntu 12.04 Desktop with Apache installed

All the configuration and mod_ssl was installed when I installed Apache, but it just wasn't linked in the right spots yet. Note: all paths below are relative to /etc/apache2/

mod_ssl is stored in ./mods-available, and the SSL site configuration is in ./sites-available, you just have to link these to their correct places in ./mods-enabled and ./sites-enabled

cd /etc/apache2
cd ./mods-enabled
sudo ln -s ../mods-available/ssl.* ./
cd ../sites-enabled
sudo ln -s ../sites-available/default-ssl ./

Restart Apache and it should work. I was trying to access https://localhost, so your results may vary for external access, but this worked for me.

Make the size of a heatmap bigger with seaborn

add plt.figure(figsize=(16,5)) before the sns.heatmap and play around with the figsize numbers till you get the desired size

...

plt.figure(figsize = (16,5))

ax = sns.heatmap(df1.iloc[:, 1:6:], annot=True, linewidths=.5)

String is immutable. What exactly is the meaning?

Probably every answer provided above is right, but my answer is specific to use of hashCode() method, to prove the points like, String... once created can't be modified and modifications will results in new value at different memory location.

public class ImmutabilityTest {

    private String changingRef = "TEST_STRING";

    public static void main(String a[]) {

        ImmutabilityTest dn = new ImmutabilityTest();

        System.out.println("ChangingRef for TEST_STRING OLD : "
                + dn.changingRef.hashCode());

        dn.changingRef = "NEW_TEST_STRING";
        System.out.println("ChangingRef for NEW_TEST_STRING : "
                + dn.changingRef.hashCode());

        dn.changingRef = "TEST_STRING";
        System.out.println("ChangingRef for TEST_STRING BACK : "
                + dn.changingRef.hashCode());

        dn.changingRef = "NEW_TEST_STRING";
        System.out.println("ChangingRef for NEW_TEST_STRING BACK : "
                + dn.changingRef.hashCode());

        String str = new String("STRING1");
        System.out.println("String Class STRING1 : " + str.hashCode());

        str = new String("STRING2");
        System.out.println("String Class STRING2 : " + str.hashCode());

        str = new String("STRING1");
        System.out.println("String Class STRING1 BACK : " + str.hashCode());

        str = new String("STRING2");
        System.out.println("String Class STRING2 BACK : " + str.hashCode());

    }
}

OUTPUT

ChangingRef for TEST_STRING OLD : 247540830
ChangingRef for NEW_TEST_STRING : 970356767
ChangingRef for TEST_STRING BACK : 247540830
ChangingRef for NEW_TEST_STRING BACK : 970356767
String Class STRING1 : -1163776448
String Class STRING2 : -1163776447
String Class STRING1 BACK : -1163776448
String Class STRING2 BACK : -1163776447

How do I instantiate a JAXBElement<String> object?

Other alternative:

JAXBElement<String> element = new JAXBElement<>(new QName("Your localPart"),
                                                String.class, "Your message");

Then:

System.out.println(element.getValue()); // Result: Your message

XSLT equivalent for JSON

I wrote my own small library around this, recently, which tries to stay as close to

5.1 Processing Model (XSLT REC) https://www.w3.org/TR/xslt#section-Processing-Model

as is possible (as I could anyway), in a few lines of JavaScript code.

Here are a few not-completely-trivial examples of use...

1. JSON-to-some-markup:

Fiddle: https://jsfiddle.net/YSharpLanguage/kj9pk8oz/10

(inspired by D.1 Document Example (XSLT REC) https://www.w3.org/TR/xslt#section-Document-Example)

where this:

var D1document = {
    type: "document", title: [ "Document Title" ],
    "": [
      { type: "chapter", title: [ "Chapter Title" ],
        "": [
        { type: "section", title: [ "Section Title" ],
          "": [
            { type: "para", "": [ "This is a test." ] },
            { type: "note", "": [ "This is a note." ] }
        ] },
        { type: "section", title: [ "Another Section Title" ],
          "": [
            { type: "para", "": [ "This is ", { emph: "another" }, " test." ] },
            { type: "note", "": [ "This is another note." ] }
        ] }
      ] }
    ] };

var D1toHTML = { $: [
  [ [ function(node) { return node.type === "document"; } ],
    function(root) {
      return "<html>\r\n\
  <head>\r\n\
    <title>\r\n\
      {title}\r\n".of(root) + "\
    </title>\r\n\
  </head>\r\n\
  <body>\r\n\
{*}".of(root[""].through(this)) + "\
  </body>\r\n\
</html>";
    }
  ],
  [ [ function(node) { return node.type === "chapter"; } ],
    function(chapter) {
      return "    <h2>{title}</h2>\r\n".of(chapter) + "{*}".of(chapter[""].through(this));
    }
  ],
  [ [ function(node) { return node.type === "section"; } ],
    function(section) {
      return "    <h3>{title}</h3>\r\n".of(section) + "{*}".of(section[""].through(this));
    }
  ],
  [ [ function(node) { return node.type === "para"; } ],
    function(para) {
      return "    <p>{*}</p>\r\n".of(para[""].through(this));
    }
  ],
  [ [ function(node) { return node.type === "note"; } ],
    function(note) {
      return '    <p class="note"><b>NOTE: </b>{*}</p>\r\n'.of(note[""].through(this));
    }
  ],
  [ [ function(node) { return node.emph; } ],
    function(emph) {
      return "<em>{emph}</em>".of(emph);
    }
  ]
] };

console.log(D1document.through(D1toHTML));

... gives:

<html>
  <head>
    <title>
      Document Title
    </title>
  </head>
  <body>
    <h2>Chapter Title</h2>
    <h3>Section Title</h3>
    <p>This is a test.</p>
    <p class="note"><b>NOTE: </b>This is a note.</p>
    <h3>Another Section Title</h3>
    <p>This is <em>another</em> test.</p>
    <p class="note"><b>NOTE: </b>This is another note.</p>
  </body>
</html>

and

2. JSON-to-JSON:

Fiddle: https://jsfiddle.net/YSharpLanguage/ppfmmu15/10

where this:

// (A "Company" is just an object with a "Team")
function Company(obj) {
  return obj.team && Team(obj.team);
}

// (A "Team" is just a non-empty array that contains at least one "Member")
function Team(obj) {
  return ({ }.toString.call(obj) === "[object Array]") &&
         obj.length &&
         obj.find(function(item) { return Member(item); });
}

// (A "Member" must have first and last names, and a gender)
function Member(obj) {
  return obj.first && obj.last && obj.sex;
}

function Dude(obj) {
  return Member(obj) && (obj.sex === "Male");
}

function Girl(obj) {
  return Member(obj) && (obj.sex === "Female");
}

var data = { team: [
  { first: "John", last: "Smith", sex: "Male" },
  { first: "Vaio", last: "Sony" },
  { first: "Anna", last: "Smith", sex: "Female" },
  { first: "Peter", last: "Olsen", sex: "Male" }
] };

var TO_SOMETHING_ELSE = { $: [

  [ [ Company ],
    function(company) {
      return { some_virtual_dom: {
        the_dudes: { ul: company.team.select(Dude).through(this) },
        the_grrls: { ul: company.team.select(Girl).through(this) }
      } }
    } ],

  [ [ Member ],
    function(member) {
      return { li: "{first} {last} ({sex})".of(member) };
    } ]

] };

console.log(JSON.stringify(data.through(TO_SOMETHING_ELSE), null, 4));

... gives:

{
    "some_virtual_dom": {
        "the_dudes": {
            "ul": [
                {
                    "li": "John Smith (Male)"
                },
                {
                    "li": "Peter Olsen (Male)"
                }
            ]
        },
        "the_grrls": {
            "ul": [
                {
                    "li": "Anna Smith (Female)"
                }
            ]
        }
    }
}

3. XSLT vs. JavaScript:

A JavaScript equivalent of...

XSLT 3.0 REC Section 14.4 Example: Grouping Nodes based on Common Values

(at: http://jsfiddle.net/YSharpLanguage/8bqcd0ey/1)

Cf. https://www.w3.org/TR/xslt-30/#grouping-examples

where...

var cities = [
  { name: "Milano",  country: "Italia",      pop: 5 },
  { name: "Paris",   country: "France",      pop: 7 },
  { name: "München", country: "Deutschland", pop: 4 },
  { name: "Lyon",    country: "France",      pop: 2 },
  { name: "Venezia", country: "Italia",      pop: 1 }
];

/*
  Cf.
  XSLT 3.0 REC Section 14.4
  Example: Grouping Nodes based on Common Values

  https://www.w3.org/TR/xslt-30/#grouping-examples
*/
var output = "<table>\r\n\
  <tr>\r\n\
    <th>Position</th>\r\n\
    <th>Country</th>\r\n\
    <th>City List</th>\r\n\
    <th>Population</th>\r\n\
  </tr>{*}\r\n\
</table>".of
  (
    cities.select().groupBy("country")(function(byCountry, index) {
      var country = byCountry[0],
          cities = byCountry[1].select().orderBy("name");
      return "\r\n\
  <tr>\r\n\
    <td>{position}</td>\r\n\
    <td>{country}</td>\r\n\
    <td>{cities}</td>\r\n\
    <td>{population}</td>\r\n\
  </tr>".
        of({ position: index + 1, country: country,
             cities: cities.map(function(city) { return city.name; }).join(", "),
             population: cities.reduce(function(sum, city) { return sum += city.pop; }, 0)
           });
    })
  );

... gives:

<table>
  <tr>
    <th>Position</th>
    <th>Country</th>
    <th>City List</th>
    <th>Population</th>
  </tr>
  <tr>
    <td>1</td>
    <td>Italia</td>
    <td>Milano, Venezia</td>
    <td>6</td>
  </tr>
  <tr>
    <td>2</td>
    <td>France</td>
    <td>Lyon, Paris</td>
    <td>9</td>
  </tr>
  <tr>
    <td>3</td>
    <td>Deutschland</td>
    <td>München</td>
    <td>4</td>
  </tr>
</table>

4. JSONiq vs. JavaScript:

A JavaScript equivalent of...

JSONiq Use Cases Section 1.1.2. Grouping Queries for JSON

(at: https://jsfiddle.net/YSharpLanguage/hvo24hmk/3)

Cf. http://jsoniq.org/docs/JSONiq-usecases/html-single/index.html#jsongrouping

where...

/*
  1.1.2. Grouping Queries for JSON
  http://jsoniq.org/docs/JSONiq-usecases/html-single/index.html#jsongrouping
*/
var sales = [
  { "product" : "broiler", "store number" : 1, "quantity" : 20  },
  { "product" : "toaster", "store number" : 2, "quantity" : 100 },
  { "product" : "toaster", "store number" : 2, "quantity" : 50 },
  { "product" : "toaster", "store number" : 3, "quantity" : 50 },
  { "product" : "blender", "store number" : 3, "quantity" : 100 },
  { "product" : "blender", "store number" : 3, "quantity" : 150 },
  { "product" : "socks", "store number" : 1, "quantity" : 500 },
  { "product" : "socks", "store number" : 2, "quantity" : 10 },
  { "product" : "shirt", "store number" : 3, "quantity" : 10 }
];

var products = [
  { "name" : "broiler", "category" : "kitchen", "price" : 100, "cost" : 70 },
  { "name" : "toaster", "category" : "kitchen", "price" : 30, "cost" : 10 },
  { "name" : "blender", "category" : "kitchen", "price" : 50, "cost" : 25 },
  {  "name" : "socks", "category" : "clothes", "price" : 5, "cost" : 2 },
  { "name" : "shirt", "category" : "clothes", "price" : 10, "cost" : 3 }
];

var stores = [
  { "store number" : 1, "state" : "CA" },
  { "store number" : 2, "state" : "CA" },
  { "store number" : 3, "state" : "MA" },
  { "store number" : 4, "state" : "MA" }
];

var nestedGroupingAndAggregate = stores.select().orderBy("state").groupBy("state")
( function(byState) {
    var state = byState[0],
        stateStores = byState[1];
    byState = { };
    return (
      (
        byState[state] =
        products.select().orderBy("category").groupBy("category")
        ( function(byCategory) {
            var category = byCategory[0],
                categoryProducts = byCategory[1],
                categorySales = sales.filter(function(sale) {
                  return stateStores.find(function(store) { return sale["store number"] === store["store number"]; }) &&
                         categoryProducts.find(function(product) { return sale.product === product.name; });
                });
            byCategory = { };
            return (
              (
                byCategory[category] =
                categorySales.select().orderBy("product").groupBy("product")
                ( function(byProduct) {
                    var soldProduct = byProduct[0],
                        soldQuantities = byProduct[1];
                    byProduct = { };
                    return (
                      (
                        byProduct[soldProduct] =
                        soldQuantities.reduce(function(sum, sale) { return sum += sale.quantity; }, 0)
                      ),
                      byProduct
                    );
                } ) // byProduct()
              ),
              byCategory
            );
        } ) // byCategory()
      ),
      byState
    );
} ); // byState()

... gives:

[
  {
    "CA": [
      {
        "clothes": [
          {
            "socks": 510
          }
        ]
      },
      {
        "kitchen": [
          {
            "broiler": 20
          },
          {
            "toaster": 150
          }
        ]
      }
    ]
  },
  {
    "MA": [
      {
        "clothes": [
          {
            "shirt": 10
          }
        ]
      },
      {
        "kitchen": [
          {
            "blender": 250
          },
          {
            "toaster": 50
          }
        ]
      }
    ]
  }
]

It is also useful to overcome the limitations of JSONPath wrt. querying against the ancestor axis, as raised by this SO question (and certainly others).

E.g., how to get the discount of a grocery item knowing its brand id, in

{
 "prods": [
    {
        "info": {
              "rate": 85
                },
        "grocery": [
                 {
                  "brand": "C",
                  "brand_id": "984"
                 },
                 {
                  "brand": "D",
                  "brand_id": "254"
                 }
                 ],
         "discount": "15"
    },
    {
        "info": {
              "rate": 100
                },
        "grocery": [
                 {
                  "brand": "A",
                  "brand_id": "983"
                 },
                 {
                  "brand": "B",
                  "brand_id": "253"
                 }
                 ],
         "discount": "20"
     }
 ]
}

A possible solution is:

var products = {
     "prods": [
        {
            "info": {
                  "rate": 85
                    },
            "grocery": [
                     {
                      "brand": "C",
                      "brand_id": "984"
                     },
                     {
                      "brand": "D",
                      "brand_id": "254"
                     }
                     ],
             "discount": "15"
        },
        {
            "info": {
                  "rate": 100
                    },
            "grocery": [
                     {
                      "brand": "A",
                      "brand_id": "983"
                     },
                     {
                      "brand": "B",
                      "brand_id": "253"
                     }
                     ],
             "discount": "20"
         }
     ]
};

function GroceryItem(obj) {
  return (typeof obj.brand === "string") && (typeof obj.brand_id === "string");
}

    // last parameter set to "true", to grab all the "GroceryItem" instances
    // at any depth:
var itemsAndDiscounts = [ products ].nodeset(GroceryItem, true).
    map(
      function(node) {
        var item = node.value, // node.value: the current "GroceryItem" (aka "$.prods[*].grocery[*]")

            discount = node.parent. // node.parent: the array of "GroceryItem" (aka "$.prods[*].grocery")
                       parent. // node.parent.parent: the product (aka "$.prods[*]")
                       discount; // node.parent.parent.discount: the product discount

        // finally, project into an easy-to-filter form:
        return { id: item.brand_id, discount: discount };
      }
    ),
    discountOfItem983;

discountOfItem983 = itemsAndDiscounts.
  filter
  (
    function(mapped) {
      return mapped.id === "983";
    }
  )
  [0].discount;

console.log("Discount of #983: " + discountOfItem983);

... which gives:

Discount of #983: 20

'HTH,

JFrame in full screen Java

Use setExtendedState(int state), where state would be JFrame.MAXIMIZED_BOTH.

How to do HTTP authentication in android?

This works for me

 URL imageUrl = new URL(url);
                    HttpURLConnection conn = (HttpURLConnection) imageUrl
                            .openConnection();
                    conn.setRequestProperty("Authorization", "basic " +
                            Base64.encode("username:password".getBytes()));
                    conn.setConnectTimeout(30000);
                    conn.setReadTimeout(30000);
                    conn.setInstanceFollowRedirects(true);
                    InputStream is = conn.getInputStream();

How to convert DateTime to a number with a precision greater than days in T-SQL?

CAST to a float or decimal instead of an int/bigint.

The integer portion (before the decimal point) represents the number of whole days. After the decimal are the fractional days (i.e., time).

Open file in a relative location in Python

Python just passes the filename you give it to the operating system, which opens it. If your operating system supports relative paths like main/2091/data.txt (hint: it does), then that will work fine.

You may find that the easiest way to answer a question like this is to try it and see what happens.

How to find sum of several integers input by user using do/while, While statement or For statement

You should do:

#include<iostream>
using namespace std;
int main ()
{

    int sum = 0;
    int number;
    int numberitems;


    cout << "Enter number of items: \n";
    cin >> numberitems;

    for(int i=0;i<numberitems;i++)
    {
        cout << "Enter number <<i<<":" \n";
        cin >> number; sum+=number;
    }
    cout<<"sum is: "<< sum<<endl;
}

And with a while statement

#include <iostream>
using namespace std;
int main ()
{
    int sum = 0;
    int number;
    int numberitems;
    cin>>numberitems;

    cout << "Enter number: \n";

    while (count <=numberitems)
    {
        cin >> number;
        sum+=number;
    }
    cout << sum << endl;
}

Execute jar file with multiple classpath libraries from command prompt

Regardless of the OS the below command should work:

java -cp "MyJar.jar;lib/*" com.mainClass

Always use quotes and please take attention that lib/*.jar will not work.

How to disable a particular checkstyle rule for a particular line of code?

Every answer refering to SuppressWarningsFilter is missing an important detail. You can only use the all-lowercase id if it's defined as such in your checkstyle-config.xml. If not you must use the original module name.

For instance, if in my checkstyle-config.xml I have:

<module name="NoWhitespaceBefore"/>

I cannot use:

@SuppressWarnings({"nowhitespacebefore"})

I must, however, use:

@SuppressWarnings({"NoWhitespaceBefore"})

In order for the first syntax to work, the checkstyle-config.xml should have:

<module name="NoWhitespaceBefore">
  <property name="id" value="nowhitespacebefore"/>
</module>

This is what worked for me, at least in the CheckStyle version 6.17.

What is Hive: Return Code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask

Even I faced the same issue - when checked on dashboard I found following Error. As the data was coming through Flume and had interrupted in between due to which may be there was inconsistency in few files.

Caused by: org.apache.hadoop.hive.serde2.SerDeException: org.codehaus.jackson.JsonParseException: Unexpected end-of-input within/between OBJECT entries

Running on fewer files it worked. Format consistency was the reason in my case.

Check if Nullable Guid is empty in c#

Check Nullable<T>.HasValue

if(!SomeProperty.HasValue ||SomeProperty.Value == Guid.Empty)
{
 //not valid GUID
}
else
{
 //Valid GUID
}

How to create a inner border for a box in html?

IE doesn't support outline-offset so another solution would be to create 2 div tags, one nested into the other one. The inner one would have a border and be slightly smaller than the container.

_x000D_

.container {_x000D_
  position: relative;_x000D_
  overflow: hidden;_x000D_
  width: 400px;_x000D_
  height: 100px;_x000D_
  background: #000000;_x000D_
  padding: 10px;_x000D_
}_x000D_
.inner {_x000D_
  position: relative;_x000D_
  overflow: hidden;_x000D_
  width: 100%;_x000D_
  height: 100%;_x000D_
  background: #000000;_x000D_
  border: 1px dashed #ffffff;_x000D_
}

_x000D_

<div class="container">_x000D_
  <div class="inner"></div>_x000D_
</div>

_x000D_

How to access the local Django webserver from outside world

I had to add this line to settings.py in order to make it work (otherwise it showed an error when accessed from another computer)

ALLOWED_HOSTS = ['*']

then ran the server with:

python manage.py runserver 0.0.0.0:9595

Also ensure that the firewall allows connections to that port

What is the size of column of int(11) in mysql in bytes?

As others have said, the minumum/maximum values the column can store and how much storage it takes in bytes is only defined by the type, not the length.

A lot of these answers are saying that the (11) part only affects the display width which isn't exactly true, but mostly.

A definition of int(2) with no zerofill specified will:

still accept a value of 100
still display a value of 100 when output (not 0 or 00)
the display width will be the width of the largest value being output from the select query.

The only thing the (2) will do is if zerofill is also specified:

a value of 1 will be shown 01.
When displaying values, the column will always have a width of the maximum possible value the column could take which is 10 digits for an integer, instead of the miniumum width required to display the largest value that column needs to show for in that specific select query, which could be much smaller.
The column can still take, and show a value exceeding the length, but these values will not be prefixed with 0s.

The best way to see all the nuances is to run:

CREATE TABLE `mytable` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `int1` int(10) NOT NULL,
    `int2` int(3) NOT NULL,
    `zf1` int(10) ZEROFILL NOT NULL,
    `zf2` int(3) ZEROFILL NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `mytable` 
(`int1`, `int2`, `zf1`, `zf2`) 
VALUES
(10000, 10000, 10000, 10000),
(100, 100, 100, 100);

select * from mytable;

which will output:

+----+-------+-------+------------+-------+
| id | int1  | int2  | zf1        | zf2   |
+----+-------+-------+------------+-------+
|  1 | 10000 | 10000 | 0000010000 | 10000 |
|  2 |   100 |   100 | 0000000100 |   100 |
+----+-------+-------+------------+-------+

This answer is tested against MySQL 5.7.12 for Linux and may or may not vary for other implementations.

How to sort the files according to the time stamp in unix?

File modification:

ls -t

Inode change:

ls -tc

File access:

ls -tu

"Newest" one at the bottom:

ls -tr

None of this is a creation time. Most Unix filesystems don't support creation timestamps.

make sounds (beep) with c++

Easiest way is probbaly just to print a ^G ascii bell

Prevent Bootstrap Modal from disappearing when clicking outside or pressing escape?

I use these attributes and it works, data-keyboard="false" data-backdrop="static"

Removing all empty elements from a hash / YAML?

Use hsh.delete_if. In your specific case, something like: hsh.delete_if { |k, v| v.empty? }

How to draw a circle with text in the middle?

I was combining some answers from other people and with float and relative it gave me the result I needed.

In HTML I use a div. I use it inside a li for a navigation bar.

.large-list-style {
    float: left;
    position: relative;
    top: -8px;

    border-radius: 50%;

    margin-right: 8px;

    background-color: rgb(34, 198, 200);

    font-size: 18px;
    color: white;
}
    .large-list-style:before,
    .large-list-style:after {
        content: '\200B';
        display:inline-block;
        line-height:0;

        padding-top: 50%;
        padding-bottom: 50%;
    }
    .large-list-style:before {
        padding-left: 16px;
    }
    .large-list-style:after {
        padding-right: 16px;
    }

ActionBarActivity cannot resolve a symbol

Make sure that in the path to the project there is no foldername having whitespace. While creating a project the specified path folders must not contain any space in their naming.

How to convert these strange characters? (Ã«, Ã, Ã¬, Ã¹, Ã)

If you see those characters you probably just didn’t specify the character encoding properly. Because those characters are the result when an UTF-8 multi-byte string is interpreted with a single-byte encoding like ISO 8859-1 or Windows-1252.

In this case Ã« could be encoded with 0xC3 0xAB that represents the Unicode character ë (U+00EB) in UTF-8.

Spring MVC Controller redirect using URL parameters instead of in response

@RequestMapping(path="/apps/add", method=RequestMethod.POST)
public String addApps(String appUrl, Model model, final RedirectAttributes redirectAttrs) {
    if (!validate(appUrl)) {
       redirectAttrs.addFlashAttribute("error", "Validation failed");
    }
    return "redirect:/apps/add"
} 

@RequestMapping(path="/apps/add", method=RequestMethod.GET)
public String addAppss(Model model) {
    String error = model.asMap().get("error");
}

Preventing form resubmission

There are 2 approaches people used to take here:

Method 1: Use AJAX + Redirect

This way you post your form in the background using JQuery or something similar to Page2, while the user still sees page1 displayed. Upon successful posting, you redirect the browser to Page2.

Method 2: Post + Redirect to self

This is a common technique on forums. Form on Page1 posts the data to Page2, Page2 processes the data and does what needs to be done, and then it does a HTTP redirect on itself. This way the last "action" the browser remembers is a simple GET on page2, so the form is not being resubmitted upon F5.

Better way to get type of a Javascript variable?

You can try using constructor.name.

[].constructor.name
new RegExp().constructor.name

As with everything JavaScript, someone will eventually invariably point that this is somehow evil, so here is a link to an answer that covers this pretty well.

An alternative is to use Object.prototype.toString.call

Object.prototype.toString.call([])
Object.prototype.toString.call(/./)

how to read value from string.xml in android?

If you want to add the string value to a button for example, simple use

android:text="@string/NameOfTheString"

The defined text in strings.xml looks like this:

 <string name="NameOfTheString">Test string</string>

How to add a bot to a Telegram Group?

Edit: now there is yet an easier way to do this - when creating your group, just mention the full bot name (eg. @UniversalAgent1Bot) and it will list it as you type. Then you can just tap on it to add it.

Old answer:

Create a new group from the menu. Don't add any bots yet
Find the bot (for instance you can go to Contacts and search for it)
Tap to open
Tap the bot name on the top bar. Your page becomes like this:
Now, tap the triple ... and you will get the Add to Group button:
Now select your group and add the bot - and confirm the addition

How to verify a Text present in the loaded page through WebDriver

If you are not bothered about the location of the text present, then you could use Driver.PageSource property as below:

Driver.PageSource.Contains("expected message");

Secure random token in Node.js

Random URL and filename string safe (1 liner)

Crypto.randomBytes(48).toString('base64').replace(/\+/g, '-').replace(/\//g, '_').replace(/\=/g, '');

Color a table row with style="color:#fff" for displaying in an email

you can easily do like this:-

    <table>
    <thead>
        <tr>
          <th bgcolor="#5D7B9D"><font color="#fff">Header 1</font></th>
          <th bgcolor="#5D7B9D"><font color="#fff">Header 2</font></th>
           <th bgcolor="#5D7B9D"><font color="#fff">Header 3</font></th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>blah blah</td>
            <td>blah blah</td>
            <td>blah blah</td>
        </tr>
    </tbody>
</table>

Demo:- http://jsfiddle.net/VWdxj/7/

Get Root Directory Path of a PHP project

echo $pathInPieces = explode(DIRECTORY_SEPARATOR , __FILE__);
echo $pathInPieces[0].DIRECTORY_SEPARATOR;

Where can I find "make" program for Mac OS X Lion?

You need to install Xcode from App Store.

Then start Xcode, go to Xcode->Preferences->Downloads and install component named "Command Line Tools". After that all the relevant tools will be placed in /usr/bin folder and you will be able to use it just as it was in 10.6.

Disabling vertical scrolling in UIScrollView

- (void)scrollViewDidScroll:(UIScrollView *)aScrollView
{
    [aScrollView setContentOffset: CGPointMake(aScrollView.contentOffset.x,0)];

}

you must have confirmed to UIScrollViewDelegate

aScrollView.delegate = self;

Referring to a table in LaTeX

You must place the label after a caption in order to for label to store the table's number, not the chapter's number.

\begin{table}
\begin{tabular}{| p{5cm} | p{5cm} | p{5cm} |}
  -- cut --
\end{tabular}
\caption{My table}
\label{table:kysymys}
\end{table}

Table \ref{table:kysymys} on page \pageref{table:kysymys} refers to the ...

Rails ActiveRecord date between

You could use below gem to find the records between dates,

This gem quite easy to use and more clear By star am using this gem and the API more clear and documentation also well explained.

Post.between_times(Time.zone.now - 3.hours,  # all posts in last 3 hours
                  Time.zone.now)

Here you could pass our field also Post.by_month("January", field: :updated_at)

Please see the documentation and try it.

php var_dump() vs print_r()

print_r() and var_dump() are Array debugging functions used in PHP for debugging purpose. print_r() function returns the array keys and its members as Array([key] = value) whereas var_dump() function returns array list with its array keys with data type and length as well e.g Array(array_length){[0] = string(1)'a'}.

Android Studio doesn't see device

To change what your application defaults to when you click run or debug in Android Studio, follow these steps:

1. go to Run

2. Click on Edit Configurations

3. Select the project

4. find the Target Device section under the General tab on the Android Application page.

That seems to be where you toggle what the project builds to. If you're importing a project it actually defaults to Emulator, not sure why. You can also select "Open Select Deployment Target Dialog" to list both connected as well as emulated devices.

How to launch multiple Internet Explorer windows/tabs from batch file?

There is a setting in the IE options that controls whether it should open new links in an existing window or in a new window. I'm not sure if you can control it from the command line but maybe changing this option would be enough for you.

In IE7 it looks like the option is "Reuse windows for launching shortcuts (when tabbed browsing is disabled)".

Difference between HashMap and Map in Java..?

Map<K,V> is an interface, HashMap<K,V> is a class that implements Map.

you can do

Map<Key,Value> map = new HashMap<Key,Value>();

Here you have a link to the documentation of each one: Map, HashMap.

Cordova : Requirements check failed for JDK 1.8 or greater

Go to Control panel Home
Advanced System Settings
Environment Variables
Choose JAVA_HOME
edit
variable value for the 1.8 one

continuing execution after an exception is thrown in java

Try this:

try
{
    throw new InvalidEmployeeTypeException();
    input.nextLine();
}
catch(InvalidEmployeeTypeException ex)
{
      //do error handling
}

continue;

"RuntimeError: Make sure the Graphviz executables are on your system's path" after installing Graphviz 2.38

Try using:

conda install python-graphviz

The graphviz executable sit on a different path from your conda directory, if you use pip install graphviz.

Programs & Examples On #Protocol handler

How do I create my own URL protocol? (e.g. so://...)

Difference between array_push() and $array[] =

The server encountered an internal error or misconfiguration and was unable to complete your request

How to create a video from images with FFmpeg?

How to modify existing XML file with XmlDocument and XmlNode in C#

assigning column names to a pandas series

How to display special characters in PHP

How to make a simple image upload using Javascript/HTML

Call and receive output from Python script in Java?

Get all child views inside LinearLayout at once

Bigger Glyphicons

How can I select item with class within a DIV?

window.onload vs <body onload=""/>

Row count with PDO

Counting rows in the table

Counting the number rows returned.

Counting the number of rows in a large resultset

SQL Server loop - how do I loop through a set of records

Python locale error: unsupported locale setting

Check if any type of files exist in a directory using BATCH script

How to get client IP address in Laravel 5+

Center image in table td in CSS

Removing double quotes from a string in Java

How to change the order of DataFrame columns?

Is it possible to include one CSS file in another?

Find out where MySQL is installed on Mac OS X

How to convert image to byte array

LINQ order by null column where order is ascending and nulls should be last

Passing multiple variables in @RequestBody to a Spring MVC controller using Ajax

Variable's memory size in Python

How to pass a value from one Activity to another in Android?

How to write a Unit Test?

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Return sql rows where field contains ONLY non-alphanumeric characters

Check if string is in a pandas dataframe

How do I find which rpm package supplies a file I'm looking for?

How to check if an Object is a Collection Type in Java?

How to empty (clear) the logcat buffer in Android

Inverse of a matrix using numpy

CSS Resize/Zoom-In effect on Image while keeping Dimensions

How can I get the root domain URI in ASP.NET?

How to use System.Net.HttpClient to post a complex type?

What is the most efficient way to create HTML elements using jQuery?

WARNING: Can't verify CSRF token authenticity rails

Why am I getting this redefinition of class error?

Git - push current branch shortcut

How to extract a single value from JSON response?

How can I make content appear beneath a fixed DIV element?

jQuery: keyPress Backspace won't fire?

Why doesn't git recognize that my file has been changed, therefore git add not working

PostgreSQL JOIN data from 3 tables

Open web in new tab Selenium + Python

Regex allow a string to only contain numbers 0 - 9 and limit length to 45

IOS: verify if a point is inside a rect

ImportError in importing from sklearn: cannot import name check_build

What is polymorphism, what is it for, and how is it used?

What is polymorphism?

What is polymorphism used for?

Sample

Explaination

More readings

Mysql password expired. Can't connect

Return the most recent record from ElasticSearch index

How to access SVG elements with Javascript

Material Design not styling alert dialogs

XAMPP Start automatically on Windows 7 startup

Open CSV file via VBA (performance)

How to run cron once, daily at 10pm

How to only find files in a given directory, and ignore subdirectories using bash

How to Batch Rename Files in a macOS Terminal?

How to convert this var string to URL in Swift

How can I make a div not larger than its contents?

Two Radio Buttons ASP.NET C#

How to properly make a http web GET request

How to search for an element in an stl list?

How do I import a CSV file in R?

How do I center a Bootstrap div with a 'spanX' class?

pandas how to check dtype for all columns in a dataframe?

Replace \n with actual new line in Sublime Text

init() got an unexpected keyword argument 'user'