Crop image to specified size and picture location

You would need to do something like this. I am typing this off the top of my head, so this may not be 100% correct.

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, 640, 360, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst); CGColorSpaceRelease(colorSpace);  CGContextDrawImage(context, CGRectMake(0,-160,640,360), cgImgFromAVCaptureSession);  CGImageRef image = CGBitmapContextCreateImage(context); UIImage* myCroppedImg = [UIImage imageWithCGImage:image]; CGContextRelease(context);

Pass PDO prepared statement to variables

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

Instantiating a generic type

You cannot do new T() due to type erasure. The default constructor can only be

public Navigation() {     this("", "", null); }

You can create other constructors to provide default values for trigger and description. You need an concrete object of T.

java doesn't run if structure inside of onclick listener

both your conditions are the same:

if(s < f) {     calc = f - s;     n = s; }else if(f > s){     calc =  s - f;     n = f;  }

if(s < f)

and

}else if(f > s){

are the same

change to

}else if(f < s){

Autoresize View When SubViews are Added

Yes, it is because you are using auto layout. Setting the view frame and resizing mask will not work.

You should read Working with Auto Layout Programmatically and Visual Format Language.

You will need to get the current constraints, add the text field, adjust the contraints for the text field, then add the correct constraints on the text field.

Generating a list of pages (not posts) without the index file

I can offer you a jquery solution

add this in your <head></head> tag

<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>

add this after </ul>

 <script> $('ul li:first').remove(); </script>

Warp \ bend effect on a UIView?

What you show looks like a mesh warp. That would be straightforward using OpenGL, but "straightforward OpenGL" is like straightforward rocket science.

I wrote an iOS app for my company called Face Dancerthat's able to do 60 fps mesh warp animations of video from the built-in camera using OpenGL, but it was a lot of work. (It does funhouse mirror type changes to faces - think "fat booth" live, plus lots of other effects.)

Read input from a JOptionPane.showInputDialog box

Your problem is that, if the user clicks cancel, operationType is null and thus throws a NullPointerException. I would suggest that you move

if (operationType.equalsIgnoreCase("Q"))

to the beginning of the group of if statements, and then change it to

if(operationType==null||operationType.equalsIgnoreCase("Q")).

This will make the program exit just as if the user had selected the quit option when the cancel button is pushed.

Then, change all the rest of the ifs to else ifs. This way, once the program sees whether or not the input is null, it doesn't try to call anything else on operationType. This has the added benefit of making it more efficient - once the program sees that the input is one of the options, it won't bother checking it against the rest of them.

Uploading into folder in FTP?

The folder is part of the URL you set when you create request: "ftp://www.contoso.com/test.htm". If you use "ftp://www.contoso.com/wibble/test.htm" then the file will be uploaded to a folder named wibble.

You may need to first use a request with Method = WebRequestMethods.Ftp.MakeDirectory to make the wibble folder if it doesn't already exist.

Call japplet from jframe

First of all, Applets are designed to be run from within the context of a browser (or applet viewer), they're not really designed to be added into other containers.

Technically, you can add a applet to a frame like any other component, but personally, I wouldn't. The applet is expecting a lot more information to be available to it in order to allow it to work fully.

Instead, I would move all of the "application" content to a separate component, like a JPanel for example and simply move this between the applet or frame as required...

ps- You can use f.setLocationRelativeTo(null) to center the window on the screen ;)

Updated

You need to go back to basics. Unless you absolutely must have one, avoid applets until you understand the basics of Swing, case in point...

Within the constructor of GalzyTable2 you are doing...

JApplet app = new JApplet(); add(app); app.init(); app.start();

...Why are you adding another applet to an applet??

Case in point...

Within the main method, you are trying to add the instance of JFrame to itself...

f.getContentPane().add(f, button2);

Instead, create yourself a class that extends from something like JPanel, add your UI logical to this, using compound components if required.

Then, add this panel to whatever top level container you need.

Take the time to read through Creating a GUI with Swing

Updated with example

import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException;  public class GalaxyTable2 extends JPanel {      private static final int PREF_W = 700;     private static final int PREF_H = 600;      String[] columnNames                     = {"Phone Name", "Brief Description", "Picture", "price",                         "Buy"};  // Create image icons     ImageIcon Image1 = new ImageIcon(                     getClass().getResource("s1.png"));     ImageIcon Image2 = new ImageIcon(                     getClass().getResource("s2.png"));     ImageIcon Image3 = new ImageIcon(                     getClass().getResource("s3.png"));     ImageIcon Image4 = new ImageIcon(                     getClass().getResource("s4.png"));     ImageIcon Image5 = new ImageIcon(                     getClass().getResource("note.png"));     ImageIcon Image6 = new ImageIcon(                     getClass().getResource("note2.png"));     ImageIcon Image7 = new ImageIcon(                     getClass().getResource("note3.png"));      Object[][] rowData = {         {"Galaxy S", "3G Support,CPU 1GHz",             Image1, 120, false},         {"Galaxy S II", "3G Support,CPU 1.2GHz",             Image2, 170, false},         {"Galaxy S III", "3G Support,CPU 1.4GHz",             Image3, 205, false},         {"Galaxy S4", "4G Support,CPU 1.6GHz",             Image4, 230, false},         {"Galaxy Note", "4G Support,CPU 1.4GHz",             Image5, 190, false},         {"Galaxy Note2 II", "4G Support,CPU 1.6GHz",             Image6, 190, false},         {"Galaxy Note 3", "4G Support,CPU 2.3GHz",             Image7, 260, false},};      MyTable ss = new MyTable(                     rowData, columnNames);      // Create a table     JTable jTable1 = new JTable(ss);      public GalaxyTable2() {         jTable1.setRowHeight(70);          add(new JScrollPane(jTable1),                         BorderLayout.CENTER);          JPanel buttons = new JPanel();          JButton button = new JButton("Home");         buttons.add(button);         JButton button2 = new JButton("Confirm");         buttons.add(button2);          add(buttons, BorderLayout.SOUTH);     }      @Override      public Dimension getPreferredSize() {         return new Dimension(PREF_W, PREF_H);     }      public void actionPerformed(ActionEvent e) {         new AMainFrame7().setVisible(true);     }      public static void main(String[] args) {          EventQueue.invokeLater(new Runnable() {             @Override             public void run() {                 try {                     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());                 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {                     ex.printStackTrace();                 }                  JFrame frame = new JFrame("Testing");                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                 frame.add(new GalaxyTable2());                 frame.pack();                 frame.setLocationRelativeTo(null);                 frame.setVisible(true);             }         });     } }

You also seem to have a lack of understanding about how to use layout managers.

Take the time to read through Creating a GUI with Swing and Laying components out in a container

xlrd.biffh.XLRDError: Excel xlsx file; not supported

The previous version, xlrd 1.2.0, may appear to work, but it could also expose you to potential security vulnerabilities. With that warning out of the way, if you still want to give it a go, type the following command:

pip install xlrd==1.2.0

Target class controller does not exist - Laravel 8

In case if you prefer grouping of this routes, you can do as :

Route::group(['namespace' => 'App\Http\Controllers\Api'], function () {
    Route::resource('user', 'UserController');
    Route::resource('book', 'BookController');
});

iPhone is not available. Please reconnect the device

So I guess all roads lead to Rome. If you're using Xcode 11.7 together with iOS 13.6, consider updating your iOS to 13.7. That worked for me. There isn't any need to upgrade Xcode to 12.

DevTools failed to load SourceMap: Could not load content for chrome-extension

Extensions without enough permission on chrome can cause these warnings, for example for React developer tools, check if the following procedure solves your problem:

Right click on the extension icon.

Go to extensions.
Click the three-dot in the row of React developer tool.

Then choose "this can read and write site data". You should see 3 options in the list, pick one that is strict enough based on how much you trust the extension and also satisfies the extensions's needs.

error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class

I got this error when I added the service class. I was using Angular 9 Went for several solutions, nothing helped me to resolve this issue. If U tried everything make sure u added ng module reference in core lib inside service. See Img

error TS1086: An accessor cannot be declared in an ambient context in Angular 9

These issue arise generally due to mismatch between @ngx-translate/core version and Angular .Before installing check compatible version of corresponding ngx_trnalsate/Core, @ngx-translate/http-loader and Angular at https://www.npmjs.com/package/@ngx-translate/core

Eg: For Angular 6.X versions,

npm install @ngx-translate/core@10 @ngx-translate/http-loader@3 rxjs --save

Like as above, follow below command and rest of code part is common for all versions(Note: Version can obtain from( https://www.npmjs.com/package/@ngx-translate/core)

npm install @ngx-translate/core@version @ngx-translate/http-loader@version rxjs --save

TS1086: An accessor cannot be declared in ambient context

In my case downgrading @angular/animations worked, if you can afford to do that, run the command

npm i @angular/[email protected]

Or use another version that might work for you from the Versions tab here: https://www.npmjs.com/package/@angular/animations

Maven dependencies are failing with a 501 error

Effective January 15, 2020, The Central Repository no longer supports insecure communication over plain HTTP and requires that all requests to the repository are encrypted over HTTPS.

If you're receiving this error, then you need to replace all URL references to Maven Central with their canonical HTTPS counterparts.

(source)

We have made the following changes in my project's build.gradle:

Old:

repositories {
   maven { url "http://repo.maven.apache.org/maven2" }
}

New:

repositories {
   maven { url "https://repo.maven.apache.org/maven2" }
}

Visual Studio Code PHP Intelephense Keep Showing Not Necessary Error

1.3.1 fixed it.

Just update your extension and you should be good to go

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

I made some small changes to Alex McKay's function/usage that I think make it a little easier to follow why it works and also adheres to the no-use-before-define rule.

First, define this function to use:

const getKeyValue = function<T extends object, U extends keyof T> (obj: T, key: U) { return obj[key] }

In the way I've written it, the generic for the function lists the object first, then the property on the object second (these can occur in any order, but if you specify U extends key of T before T extends object you break the no-use-before-define rule, and also it just makes sense to have the object first and its' property second. Finally, I've used the more common function syntax instead of the arrow operators (=>).

Anyways, with those modifications you can just use it like this:

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

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

getKeyValue(user, "name")

Which, again, I find to be a bit more readable.

Invalid hook call. Hooks can only be called inside of the body of a function component

This error can also occur when you make the mistake of declaring useDispatch from react-redux the wrong way: when you go:
const dispatch = useDispatch instead of:
const dispatch = useDispatch(); (i.e remember to add the parenthesis)

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

Don't Use Any, Use Generics

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

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

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

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

Here is a full example:

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

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

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

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

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

// => 'John Smith'

Alternative syntax

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

Access blocked by CORS policy: Response to preflight request doesn't pass access control check

If you are using Spring as Back-End server and especially using Spring Security then i found a solution by putting http.cors(); in the configure method. The method looks like that:

protected void configure(HttpSecurity http) throws Exception {
        http
                .csrf().disable()
                .authorizeRequests() // authorize
                .anyRequest().authenticated() // all requests are authenticated
                .and()
                .httpBasic();

        http.cors();
}

Errors: Data path ".builders['app-shell']" should have required property 'class'

I was also coming across this issue and for me when doing more updates more issues occurred.

What worked for me in the end was more or less to remove angular cli and re install it with these steps:

npm uninstall -g @angular/cli
npm cache clean --force
npm install -g @angular/cli

this helped me out source: how to uninstall angular/cli

Why am I getting Unknown error in line 1 of pom.xml?

In my pom.xml file I had to downgrade the version from 2.1.6.RELEASE for spring-boot-starter-parent artifact to 2.1.4.RELEASE

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
</parent>

to be changed to

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
</parent>

And that weird Unknown error disappeared

The POST method is not supported for this route. Supported methods: GET, HEAD. Laravel

In my case just run the command and worked like charm.

php artisan route:clear

The iOS Simulator deployment targets is set to 7.0, but the range of supported deployment target version for this platform is 8.0 to 12.1

if anybody is experiencing is issue while updating to the latest react native, try updating your pod file with

  use_flipper!
  post_install do |installer|
    flipper_post_install(installer)
    installer.pods_project.targets.each do |target|
      target.build_configurations.each do |config|
        config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET'
      end
    end
   end

Typescript: Type 'string | undefined' is not assignable to type 'string'

You can now use the non-null assertion operator that is here exactly for your use case.

It tells TypeScript that even though something looks like it could be null, it can trust you that it's not:

let name1:string = person.name!; 
//                            ^ note the exclamation mark here

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

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

Example, instead of:

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

do this:

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

useState set method not reflecting change immediately

_{Additional details to the previous answer:}

While React's setState is asynchronous (both classes and hooks), and it's tempting to use that fact to explain the observed behavior, it is not the reason why it happens.

TLDR: The reason is a closure scope around an immutable const value.

Solutions:

read the value in render function (not inside nested functions):

  useEffect(() => { setMovies(result) }, [])
  console.log(movies)

add the variable into dependencies (and use the react-hooks/exhaustive-deps eslint rule):

  useEffect(() => { setMovies(result) }, [])
  useEffect(() => { console.log(movies) }, [movies])

use a mutable reference (when the above is not possible):

  const moviesRef = useRef(initialValue)
  useEffect(() => {
    moviesRef.current = result
    console.log(moviesRef.current)
  }, [])

Explanation why it happens:

If async was the only reason, it would be possible to await setState().

However, both props and state are assumed to be unchanging during 1 render.

Treat this.state as if it were immutable.

With hooks, this assumption is enhanced by using constant values with the const keyword:

const [state, setState] = useState('initial')

The value might be different between 2 renders, but remains a constant inside the render itself and inside any closures (functions that live longer even after render is finished, e.g. useEffect, event handlers, inside any Promise or setTimeout).

Consider following fake, but synchronous, React-like implementation:

_x000D_

// sync implementation:

let internalState
let renderAgain

const setState = (updateFn) => {
  internalState = updateFn(internalState)
  renderAgain()
}

const useState = (defaultState) => {
  if (!internalState) {
    internalState = defaultState
  }
  return [internalState, setState]
}

const render = (component, node) => {
  const {html, handleClick} = component()
  node.innerHTML = html
  renderAgain = () => render(component, node)
  return handleClick
}

// test:

const MyComponent = () => {
  const [x, setX] = useState(1)
  console.log('in render:', x) // ?
  
  const handleClick = () => {
    setX(current => current + 1)
    console.log('in handler/effect/Promise/setTimeout:', x) // ? NOT updated
  }
  
  return {
    html: `<button>${x}</button>`,
    handleClick
  }
}

const triggerClick = render(MyComponent, document.getElementById('root'))
triggerClick()
triggerClick()
triggerClick()

_x000D_

<div id="root"></div>

_x000D_

Can't perform a React state update on an unmounted component

Inspired by @ford04 answer I use this hook, which also takes callbacks for success, errors, finally and an abortFn:

export const useAsync = (
        asyncFn, 
        onSuccess = false, 
        onError = false, 
        onFinally = false, 
        abortFn = false
    ) => {

    useEffect(() => {
        let isMounted = true;
        const run = async () => {
            try{
                let data = await asyncFn()
                if (isMounted && onSuccess) onSuccess(data)
            } catch(error) {
                if (isMounted && onError) onSuccess(error)
            } finally {
                if (isMounted && onFinally) onFinally()
            }
        }
        run()
        return () => {
            if(abortFn) abortFn()
            isMounted = false
        };
    }, [asyncFn, onSuccess])
}

If the asyncFn is doing some kind of fetch from back-end it often makes sense to abort it when the component is unmounted (not always though, sometimes if ie. you're loading some data into a store you might as well just want to finish it even if component is unmounted)

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

Issue has been resolved after updating Android studio version to 3.3-rc2 or latest released version.

cr: @shadowsheep

have to change version under /gradle/wrapper/gradle-wrapper.properties. refer below url https://stackoverflow.com/a/56412795/7532946

TypeScript and React - children type?

This is what worked for me:

interface Props {
  children: JSX.Element[] | JSX.Element
}

Edit I would recommend using children: React.ReactNode instead now.

ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.2.0 but 3.2.1 was found instead

First install your targeted version

npm i [email protected] --save-dev --save-exact

Then before compiling do

   npm i

React Hook Warnings for async function in useEffect: useEffect function must return a cleanup function or nothing

For other readers, the error can come from the fact that there is no brackets wrapping the async function:

Considering the async function initData

  async function initData() {
  }

This code will lead to your error:

  useEffect(() => initData(), []);

But this one, won't:

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

(Notice the brackets around initData()

Xcode 10.2.1 Command PhaseScriptExecution failed with a nonzero exit code

I had a similar error

/{path to project root}/Pods/Target Support Files/Pods-{project name}/Pods-{project name}-frameworks.sh: Permission denied
Command PhaseScriptExecution failed with a nonzero exit code

In my case I had received a zip of a repo that included the Pods folder. It turns out that at some point between it being originally created and sent to me, the *.sh files in Pods/Target Support Files/Pods-{PROJECT}/ had all lost their execute permissions. Giving those files +x was the solution

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory in ionic 3

Pls check your node version :

_x000D_

   $  node -v

_x000D_

If its 10.1.1 something , then you need to update your root level node version via below commands

_x000D_

$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash


$ source ~/.nvm/nvm.sh

$ nvm ls

$ nvm install 12.18.1

_x000D_

Once done pls restart your terminal or visual studio.

It's work 100$

For ionic user pls add the below code in your package.json

_x000D_

 "ionic:build": "node --max-old-space-size=16384 ./node_modules/@ionic/app-scripts/bin/ionic-app-scripts.js build",

_x000D_

A fatal error occurred while creating a TLS client credential. The internal error state is 10013

I found this here: https://port135.com/schannel-the-internal-error-state-is-10013-solved/

"Correct file permissions Correct the permissions on the c:\ProgramData\Microsoft\Crypto\RSA\MachineKeys folder:

Everyone Access: Special Applies to 'This folder only' Network Service Access: Read & Execute Applies to 'This folder, subfolders and files' Administrators Access: Full Control Applies to 'This folder, subfolder and files' System Access: Full control Applies to 'This folder, subfolder and Files' IUSR Access: Full Control Applies to 'This folder, subfolder and files' The internal error state is 10013 After these changes, restart the server. The 10013 errors should disappear."

How to set width of mat-table column in angular?

Just add style="width:5% !important;" to th and td

  <ng-container matColumnDef="username">
    <th style="width:5% !important;" mat-header-cell *matHeaderCellDef> Full Name </th>
    <td style="width:5% !important;" mat-cell *matCellDef="let element"> {{element.username}} ( {{element.usertype}} )</td>
  </ng-container>

IntelliJ can't recognize JavaFX 11 with OpenJDK 11

The issue that JavaFX is no longer part of JDK 11. The following solution works using IntelliJ (haven't tried it with NetBeans):

Add JavaFX Global Library as a dependency:

Settings -> Project Structure -> Module. In module go to the Dependencies tab, and click the add "+" sign -> Library -> Java-> choose JavaFX from the list and click Add Selected, then Apply settings.
Right click source file (src) in your JavaFX project, and create a new module-info.java file. Inside the file write the following code :
```
module YourProjectName { 
    requires javafx.fxml;
    requires javafx.controls;
    requires javafx.graphics;
    opens sample;
}
```
These 2 steps will solve all your issues with JavaFX, I assure you.

Reference : There's a You Tube tutorial made by The Learn Programming channel, will explain all the details above in just 5 minutes. I also recommend watching it to solve your problem: https://www.youtube.com/watch?v=WtOgoomDewo

What is "not assignable to parameter of type never" error in typescript?

Remove "strictNullChecks": true from "compilerOptions" or set it to false in the tsconfig.json file of your Ng app. These errors will go away like anything and your app would compile successfully.

Disclaimer: This is just a workaround. This error appears only when the null checks are not handled properly which in any case is not a good way to get things done.

Support for the experimental syntax 'classProperties' isn't currently enabled

Adding

"plugins": [
    [
      "@babel/plugin-proposal-class-properties"
    ]
  ]

into .babelrc works for me.

How to convert string to boolean in typescript Angular 4

Define extension: String+Extension.ts

interface String {
  toBoolean(): boolean
}

String.prototype.toBoolean = function (): boolean {
  switch (this) {
    case 'true':
    case '1':
    case 'on':
    case 'yes':
      return true
    default:
      return false
  }
}

And import in any file where you want to use it '@/path/to/String+Extension'

What is the Record type in typescript?

A Record lets you create a new type from a Union. The values in the Union are used as attributes of the new type.

For example, say I have a Union like this:

type CatNames = "miffy" | "boris" | "mordred";

Now I want to create an object that contains information about all the cats, I can create a new type using the values in the CatName Union as keys.

type CatList = Record<CatNames, {age: number}>

If I want to satisfy this CatList, I must create an object like this:

const cats:CatList = {
  miffy: { age:99 },
  boris: { age:16 },
  mordred: { age:600 }
}

You get very strong type safety:

If I forget a cat, I get an error.
If I add a cat that's not allowed, I get an error.
If I later change CatNames, I get an error. This is especially useful because CatNames is likely imported from another file, and likely used in many places.

Real-world React example.

I used this recently to create a Status component. The component would receive a status prop, and then render an icon. I've simplified the code quite a lot here for illustrative purposes

I had a union like this:

type Statuses = "failed" | "complete";

I used this to create an object like this:

const icons: Record<
  Statuses,
  { iconType: IconTypes; iconColor: IconColors }
> = {
  failed: {
    iconType: "warning",
    iconColor: "red"
  },
  complete: {
    iconType: "check",
    iconColor: "green"
  };

I could then render by destructuring an element from the object into props, like so:

const Status = ({status}) => <Icon {...icons[status]} />

If the Statuses union is later extended or changed, I know my Status component will fail to compile and I'll get an error that I can fix immediately. This allows me to add additional error states to the app.

Note that the actual app had dozens of error states that were referenced in multiple places, so this type safety was extremely useful.

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

Without sorting or extra memory. Time Complexity: O(N)

  public int solution(int[] A) {
        for (int i = 0; i < A.length; i++) {
            if (A[i] <= 0 || A[i] >= A.length) continue;
            int cur = A[i], point;
            while (cur > 0 && cur <= A.length && A[cur - 1] != cur) {
                point = A[cur - 1];
                A[cur - 1] = cur;
                cur = point;
                if (cur < 0 || cur >= A.length) break;
            }
        }
        for (int i = 0; i < A.length; i++) {
            if (A[i] != i+1) return i+1;
        }
        return A.length + 1;
    }

Under which circumstances textAlign property works in Flutter?

You can use the container, It will help you to set the alignment.

Widget _buildListWidget({Map reminder}) {
return Container(
  color: Colors.amber,
  alignment: Alignment.centerLeft,
  padding: EdgeInsets.all(20),
  height: 80,
  child: Column(
    mainAxisAlignment: MainAxisAlignment.center,
    crossAxisAlignment: CrossAxisAlignment.center,
    children: <Widget>[
      Container(
        alignment: Alignment.centerLeft,
        child: Text(
          reminder['title'],
          textAlign: TextAlign.left,
          style: TextStyle(
            fontSize: 16,
            color: Colors.black,
            backgroundColor: Colors.blue,
            fontWeight: FontWeight.normal,
          ),
        ),
      ),
      Container(
        alignment: Alignment.centerRight,
        child: Text(
          reminder['Date'],
          textAlign: TextAlign.right,
          style: TextStyle(
            fontSize: 12,
            color: Colors.grey,
            backgroundColor: Colors.blue,
            fontWeight: FontWeight.normal,
          ),
        ),
      ),
    ],
  ),
);
}

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0

It work for me in this issue in a project of react-native:

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.

244 actionable tasks: 2 executed, 242 up-to-date D8: Cannot fit requested classes in a single dex file (# fields: 67296 > 65536) com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: The number of method references in a .dex file cannot exceed 64K. Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html ....

I Did this:

Uninstall the app from my device:
The number of method references in a .dex file cannot exceed 64k API 17

Confirm password validation in Angular 6

This question could be solved with a combination of these two answers: https://stackoverflow.com/a/43493648/6294072 and https://stackoverflow.com/a/47670892/6294072

So first of all, you would need a custom validator for checking the passwords, that could look like this:

checkPasswords(group: FormGroup) { // here we have the 'passwords' group
  const password = group.get('password').value;
  const confirmPassword = group.get('confirmPassword').value;

  return password === confirmPassword ? null : { notSame: true }     
}

and you would create a formgroup for your fields, instead of just two form controls, then mark that custom validator for your form group:

this.myForm = this.fb.group({
  password: ['', [Validators.required]],
  confirmPassword: ['']
}, { validators: this.checkPasswords })

and then as mentioned in other answer, the mat-error only shows if a FormControl is invalid, so you need an error state matcher:

export class MyErrorStateMatcher implements ErrorStateMatcher {
  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
    const invalidCtrl = !!(control?.invalid && control?.parent?.dirty);
    const invalidParent = !!(control?.parent?.invalid && control?.parent?.dirty);

    return invalidCtrl || invalidParent;
  }
}

in the above you can tweak when to show error message. I would only show message when the password field is touched. Also I would like above, remove the required validator from the confirmPassword field, since the form is not valid anyway if passwords do not match.

Then in component, create a new ErrorStateMatcher:

matcher = new MyErrorStateMatcher();

Finally, the template would look like this:

<form [formGroup]="myForm">
  <mat-form-field>
    <input matInput placeholder="New password" formControlName="password" required>
    <mat-error *ngIf="myForm.hasError('required', 'password')">
      Please enter your new password
    </mat-error>
  </mat-form-field>

  <mat-form-field>
    <input matInput placeholder="Confirm password" formControlName="confirmPassword" [errorStateMatcher]="matcher">
    <mat-error *ngIf="myForm.hasError('notSame')">
      Passwords do not match
    </mat-error>  
  </mat-form-field>
</form>

Here's a demo for you with the above code: StackBlitz

Rounded Corners Image in Flutter

You can also use CircleAvatar, which comes with flutter

CircleAvatar(
  radius: 20,
  backgroundImage: NetworkImage('https://via.placeholder.com/140x100')
)

Couldn't process file resx due to its being in the Internet or Restricted zone or having the mark of the web on the file

If you downloaded the file from the internet, either separately or inside a .zip file or similar, it may have been "locked" because it is flagged as coming from the internet zone. Many programs will use this as a sign that the content should not be trusted.

The simplest solution is to right-click the file in Windows Explorer, select Properties, and along the bottom of this dialog, you should have an "Unblock" option. Remember to click OK to accept the change.

If you got the file from an archive, it is usually better to unblock the archive first, if the file is flagged as coming from the internet zone, and you unzip it, that flag might propagate to many of the files you just unarchived. If you unblock first, the unarchived files should be fine.

There's also a Powershell command for this, Unblock-File:

> Unblock-File *

Additionally, there are ways to write code that will remove the lock as well.

From the comments by @Defcon1: You can also combine Unblock-File with Get-ChildItem to create a pipeline that unblocks file recursively. Since Unblock-File has no way to find files recursively by itself, you have to use Get-ChildItem to do that part.

> Get-ChildItem -Path '<YOUR-SOLUTION-PATH>' -Recurse | Unblock-File

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured

For spring boot version 2.X.X below configuration worked for me.

spring.datasource.url=jdbc:mysql://localhost:3306/rest
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update

Old jdbc driver is deprecated. The new one is mentioned on above configuration. Please use the same and restart the project.

How to use `@ts-ignore` for a block

You can't. This is an open issue in TypeScript: https://github.com/Microsoft/TypeScript/issues/19573

Everytime I run gulp anything, I get a assertion error. - Task function must be specified

You don't need to downgrade your gulp from gulp 4. Use gulp.series() to combine multiple tasks. At first install gulp globally with

npm install --global gulp-cli

and then install locally on your working directory with

npm install --save-dev gulp

see details here

Example:

package.json

{
  "name": "gulp-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "browser-sync": "^2.26.3",
    "gulp": "^4.0.0",
    "gulp-sass": "^4.0.2"
  },
  "dependencies": {
    "bootstrap": "^4.3.1",
    "jquery": "^3.3.1",
    "popper.js": "^1.14.7"
  }
}

gulpfile.js

var gulp = require("gulp");
var sass = require('gulp-sass');
var browserSync = require('browser-sync').create();

// Specific Task
function js() {
    return gulp
    .src(['node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js', 'node_modules/popper.js/dist/umd/popper.min.js'])
    .pipe(gulp.dest('src/js'))
    .pipe(browserSync.stream());
}
gulp.task(js);

// Specific Task
function gulpSass() {
    return gulp
    .src(['src/scss/*.scss'])
    .pipe(sass())
    .pipe(gulp.dest('src/css'))
    .pipe(browserSync.stream());
}
gulp.task(gulpSass);

// Run multiple tasks
gulp.task('start', gulp.series(js, gulpSass));

Run gulp start to fire multiple tasks & run gulp js or gulp gulpSass for specific task.

Handling back button in Android Navigation Component

you can provide your custom back navigation by using OnBackPressedDispatcher

class MyFragment : Fragment() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // This callback will only be called when MyFragment is at least Started.
    val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {
        // Handle the back button event
// and if you want to need navigate up
//NavHostFragment.findNavController(this).navigateUp()
    }

    // The callback can be enabled or disabled here or in the lambda
}
}

More explanations in android official guide: https://developer.android.com/guide/navigation/navigation-custom-back

Select default option value from typescript angular 6

I think the best way to do it to bind it with ngModel.

<select name="num" [(ngModel)]="number">
                <option *ngFor="let n of numbers" [value]="n">{{n}}</option>
              </select>

and in ts file add

number=47;
numbers=[45,46,47]

Vue.js get selected option on @change

You can save your @change="onChange()" an use watchers. Vue computes and watches, it´s designed for that. In case you only need the value and not other complex Event atributes.

Something like:

  ...
  watch: {
    leaveType () {
      this.whateverMethod(this.leaveType)
    }
  },
  methods: {
     onChange() {
         console.log('The new value is: ', this.leaveType)
     }
  }

Google Maps shows "For development purposes only"

Watermarked with ?“for development purposes only” is returned when any of the following is true:

The request is missing an API key.
Billing has not been enabled on your account.
The provided billing method is invalid (for example an expired credit card).
A self-imposed daily limit has been exceeded.

How to add image in Flutter

An alternative way to put images in your app (for me it just worked that way):

1 - Create an assets/images folder

2 - Add your image to the new folder

3 - Register the assets folder in pubspec.yaml

4 - Use this code:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    var assetsImage = new AssetImage('assets/images/mountain.jpg'); //<- Creates an object that fetches an image.
    var image = new Image(image: assetsImage, fit: BoxFit.cover); //<- Creates a widget that displays an image.

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Climb your mountain!"),
          backgroundColor: Colors.amber[600], //<- background color to combine with the picture :-)
        ),
        body: Container(child: image), //<- place where the image appears
      ),
    );
  }
}

Authentication plugin 'caching_sha2_password' is not supported

You can go to Settings->Project->Project Interpreter and here install latest version of mysql-connector-python package. In my case it was mysql-connector-python 8.0.15.

Flutter Circle Design

I would use a https://docs.flutter.io/flutter/widgets/Stack-class.html to be able to freely position widgets.

To create circles

  new BoxDecoration(
    color: effectiveBackgroundColor,
    image: backgroundImage != null
      ? new DecorationImage(image: backgroundImage, fit: BoxFit.cover)
      : null,
    shape: BoxShape.circle,
  ),

and https://docs.flutter.io/flutter/widgets/Transform/Transform.rotate.html to position the white dots.

java.lang.NoClassDefFoundError:failed resolution of :Lorg/apache/http/ProtocolVersion

This link android-9.0-changes-28-->Apache HTTP client deprecation explains reason for adding the following to your AndroidManifest.xml:

<uses-library android:name="org.apache.http.legacy" android:required="false"/>

With Android 6.0, we removed support for the Apache HTTP client. Beginning with Android 9, that library is removed from the bootclasspath and is not available to apps by default.

Can not find module “@angular-devkit/build-angular”

npm install --save-dev @angular-devkit/build-angular

It's Install @angular-devkit/build-angular as dev dependency. This package is newly introduced in Angular 6.0

Could not find module "@angular-devkit/build-angular"

npm i --save-dev @angular-devkit/build-angular

This code install @angular-devkit/build-angular as dev dependency.

100% TESTED.

Can't bind to 'dataSource' since it isn't a known property of 'table'

Please see your dataSource varibale doesn't get the data from the server or dataSource is not assigned to the expected format of data.

ERROR Error: StaticInjectorError(AppModule)[UserformService -> HttpClient]:

Import this in to app.module.ts

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

and add this one in imports

HttpClientModule

Importing json file in TypeScript

With TypeScript 2.9.+ you can simply import JSON files with typesafety and intellisense like this:

import colorsJson from '../colors.json'; // This import style requires "esModuleInterop", see "side notes"
console.log(colorsJson.primaryBright);

Make sure to add these settings in the compilerOptions section of your tsconfig.json (documentation):

"resolveJsonModule": true,
"esModuleInterop": true,

Side notes:

Typescript 2.9.0 has a bug with this JSON feature, it was fixed with 2.9.2
The esModuleInterop is only necessary for the default import of the colorsJson. If you leave it set to false then you have to import it with import * as colorsJson from '../colors.json'

Angular - "has no exported member 'Observable'"

I replaced the original code with import { Observable, of } from 'rxjs', and the problem is solved.

AttributeError: Module Pip has no attribute 'main'

Try this command.

python -m pip install --user pip==9.0.1

How to open Android Device Monitor in latest Android Studio 3.1

As said in "Testing the game on your Android device", I followed these three steps

With the game still running on your device, return to your computer.
Navigate to the directory containing the Android SDK Tools.
Navigate to tools and double click the application called monitor.

This was prompting the following error

I've also tested using cmd and the same error persisted

To fix it, I had to go to AndroidSDKTools\tools\lib\monitor-x86_64 and double click in the monitor application

And then the Android Device Manager just started as normal

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified

I encountered this error simply because I misspelled the spring.datasource.url value in the application.properties file and I was using postgresql:

Problem was: jdbc:postgres://localhost:<port-number>/<database-name>

Fixed to: jdbc:postgresql://localhost:<port-number>/<database-name>

NOTE: the difference is postgres & postgresql, the two are 2 different things.

Further causes and solutions may be found here

Round button with text and icon in flutter

You can do something like,

RaisedButton.icon( elevation: 4.0,
                    icon: Image.asset('images/image_upload.png' ,width: 20,height: 20,) ,
                      color: Theme.of(context).primaryColor,
                    onPressed: getImage,
                    label: Text("Add Team Image",style: TextStyle(
                        color: Colors.white, fontSize: 16.0))
                  ),

Converting a POSTMAN request to Curl

You can see the button "Code" in the attached screenshot, press it and you can get your code in many different languages including PHP cURL

What could cause an error related to npm not being able to find a file? No contents in my node_modules subfolder. Why is that?

Following what @viveknuna suggested, I upgraded to the latest version of node.js and npm using the downloaded installer. I also installed the latest version of yarn using a downloaded installer. Then, as you can see below, I upgraded angular-cli and typescript. Here's what that process looked like:

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>npm install -g @angular/cli@latest
C:\Users\Jack\AppData\Roaming\npm\ng -> C:\Users\Jack\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\@angular\cli\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ @angular/[email protected]
added 75 packages, removed 166 packages, updated 61 packages and moved 24 packages in 29.084s

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>npm install -g typescript
C:\Users\Jack\AppData\Roaming\npm\tsserver -> C:\Users\Jack\AppData\Roaming\npm\node_modules\typescript\bin\tsserver
C:\Users\Jack\AppData\Roaming\npm\tsc -> C:\Users\Jack\AppData\Roaming\npm\node_modules\typescript\bin\tsc
+ [email protected]
updated 1 package in 2.427s

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>node -v
v8.10.0

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>npm -v
5.6.0

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>yarn --version
1.5.1

Thereafter, I ran yarn and npm start in my angular folder and all appears to be well. Here's what that looked like:

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>yarn
yarn install v1.5.1
[1/4] Resolving packages...
[2/4] Fetching packages...
info [email protected]: The platform "win32" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning "@angular/cli > @schematics/[email protected]" has incorrect peer dependency "@angular-devkit/[email protected]".
warning "@angular/cli > @angular-devkit/schematics > @schematics/[email protected]" has incorrect peer dependency "@angular-devkit/[email protected]".
warning " > [email protected]" has incorrect peer dependency "@angular/compiler@^2.3.1 || >=4.0.0-beta <5.0.0".
warning " > [email protected]" has incorrect peer dependency "@angular/core@^2.3.1 || >=4.0.0-beta <5.0.0".
[4/4] Building fresh packages...
Done in 232.79s.

D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular>npm start

> [email protected] start D:\Dev\AspNetBoilerplate\MyProject\3.5.0\angular
> ng serve --host 0.0.0.0 --port 4200

** NG Live Development Server is listening on 0.0.0.0:4200, open your browser on http://localhost:4200/ **
Date: 2018-03-22T13:17:28.935Z
Hash: 8f226b6fa069b7c201ea
Time: 22494ms
chunk {account.module} account.module.chunk.js () 129 kB  [rendered]
chunk {app.module} app.module.chunk.js () 497 kB  [rendered]
chunk {common} common.chunk.js (common) 1.46 MB  [rendered]
chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
chunk {main} main.bundle.js (main) 515 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js (polyfills) 1.1 MB [initial] [rendered]
chunk {styles} styles.bundle.js (styles) 1.53 MB [initial] [rendered]
chunk {vendor} vendor.bundle.js (vendor) 15.1 MB [initial] [rendered]

webpack: Compiled successfully.

Unable to compile simple Java 10 / Java 11 project with Maven

Specify maven.compiler.source and target versions.

1) Maven version which supports jdk you use. In my case JDK 11 and maven 3.6.0.

2) pom.xml

<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

As an alternative, you can fully specify maven compiler plugin. See previous answers. It is shorter in my example :)

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <release>11</release>
            </configuration>
        </plugin>
    </plugins>
</build>

3) rebuild the project to avoid compile errors in your IDE.

4) If it still does not work. In Intellij Idea I prefer using terminal instead of using terminal from OS. Then in Idea go to file -> settings -> build tools -> maven. I work with maven I downloaded from apache (by default Idea uses bundled maven). Restart Idea then and run mvn clean install again. Also make sure you have correct Path, MAVEN_HOME, JAVA_HOME environment variables.

I also saw this one-liner, but it does not work.

<maven.compiler.release>11</maven.compiler.release>

I made some quick starter projects, which I re-use in other my projects, feel free to check:

Getting "TypeError: failed to fetch" when the request hasn't actually failed

I know it's a relative old post but, I would like to share what worked for me: I've simply input "http://" before "localhost" in the url. Hope it helps somebody.

Error:(9, 5) error: resource android:attr/dialogCornerRadius not found

In my case, this error ocurred while i was using the

implementation 'com.android.support:appcompat-v7:+'
implementation 'com.android.support:design:+'

libraries together with googles

implementation 'com.google.android.material:material-components:+'

library. If this is the case in your project, i highly recommend to fully remove the google material components library from your project.

How to remove whitespace from a string in typescript?

Problem

The trim() method removes whitespace from both sides of a string.

Source

Solution

You can use a Javascript replace method to remove white space like

"hello world".replace(/\s/g, "");

Example

_x000D_

var out = "hello world".replace(/\s/g, "");_x000D_
console.log(out);

_x000D_

After Spring Boot 2.0 migration: jdbcUrl is required with driverClassName

I have added in Application Class

@Bean
@ConfigurationProperties("app.datasource")
public DataSource dataSource() {
    return DataSourceBuilder.create().build();
}

application.properties I have added

app.datasource.url=jdbc:mysql://localhost/test
app.datasource.username=dbuser
app.datasource.password=dbpass
app.datasource.pool-size=30

More details Configure a Custom DataSource

Flutter: how to make a TextField with HintText but no Underline?

new flutter sdk since after integration of web and desktop support you need to specify individually like this

TextFormField(
    cursorColor: Colors.black,
    keyboardType: inputType,
    decoration: new InputDecoration(
        border: InputBorder.none,
        focusedBorder: InputBorder.none,
        enabledBorder: InputBorder.none,
        errorBorder: InputBorder.none,
        disabledBorder: InputBorder.none,
        contentPadding:
            EdgeInsets.only(left: 15, bottom: 11, top: 11, right: 15),
        hintText: "Hint here"),
  )

'ls' is not recognized as an internal or external command, operable program or batch file

We can use ls and many other Linux commands in Windows cmd. Just follow these steps.

Steps:

1) Install Git in your computer - https://git-scm.com/downloads.

2) After installing Git, go to the folder in which Git is installed. Mostly it will be in C drive and then Program Files Folder.

3) In Program Files folder, you will find the folder named Git, find the bin folder which is inside usr folder in the Git folder.

In my case, the location for bin folder was - C:\Program Files\Git\usr\bin

4) Add this location (C:\Program Files\Git\usr\bin) in path variable, in system environment variables.

5) You are done. Restart cmd and try to run ls and other Linux commands.

Angular 5, HTML, boolean on checkbox is checked

When you have a copy of an object the [checked] attribute might not work, in that case, you can use (change) in this way:

        <input type="checkbox" [checked]="item.selected" (change)="item.selected = !item.selected">

ERROR Source option 1.5 is no longer supported. Use 1.6 or later

Make sure you have following configuration in your pom.xml file.

<properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

How to avoid the "Windows Defender SmartScreen prevented an unrecognized app from starting warning"

If you have a standard code signing certificate, some time will be needed for your application to build trust. Microsoft affirms that an Extended Validation (EV) Code Signing Certificate allows us to skip this period of trust-building. According to Microsoft, extended validation certificates allow the developer to immediately establish a reputation with SmartScreen. Otherwise, the users will see a warning like "Windows Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.", with the two buttons: "Run anyway" and "Don't run".

Another Microsoft resource states the following (quote): "Although not required, programs signed by an EV code signing certificate can immediately establish a reputation with SmartScreen reputation services even if no prior reputation exists for that file or publisher. EV code signing certificates also have a unique identifier which makes it easier to maintain reputation across certificate renewals."

My experience is as follows. Since 2005, we have been using regular (non-EV) code signing certificates to sign .MSI, .EXE and .DLL files with time stamps, and there has never been a problem with SmartScreen until 2018, when there was just one case when it took 3 days for a beta version of our application to build trust since we have released it to beta testers, and it was in the middle of certificate validity period. I don't know what SmartScreen might not like in that specific version of our application, but there have been no SmartScreen complaints since then. Therefore, if your certificate is a non-EV, it is a signed application (such as an .MSI file) that will build trust over time, not a certificate. For example, a certificate can be issued a few months ago and used to sign many files, but for each signed file you publish, it may take a few days for SmartScreen to stop complaining about the file after publishing, as was in our case in 2018.

As a conclusion, to avoid the warning completely, i.e. prevent it from happening even suddenly, you need an Extended Validation (EV) code signing certificate.

js 'types' can only be used in a .ts file - Visual Studio Code using @ts-check

You must use a .ts file - e.g. test.ts to get Typescript ~~validation, intellisense~~ typing of vars, return types, as well as "typed" error checking (e.g. passing a string to a method that expects an number param will error out).

It will be transpiled into (standard) .js via tsc.

Update (11/2018):

Clarification needed based on down-votes, very helpful comments and other answers.

types

Yes, you can do type checking in VS Code in .js files with @ts-check - as shown in the animation
What I originally was referring to for Typescript types is something like this in .ts which isn't quite the same thing:

hello-world.ts
```
function hello(str: string): string {
  return 1;
}

function foo(str:string):void{
   console.log(str);
}
```
This will not compile. Error: Type "1" is not assignable to String
if you tried this syntax in a Javascript hello-world.js file:
```
//@ts-check

function hello(str: string): string {
  return 1;
}

function foo(str:string):void{
   console.log(str);
}
```
The error message referenced by OP is shown: [js] 'types' can only be used in a .ts file

If there's something I missed that covers this as well as the OP's context, please add. Let's all learn.

Still getting warning : Configuration 'compile' is obsolete and has been replaced with 'implementation'

In my case the issue was the Google services gradle plugin with the following line in the gradle file:

apply plugin: 'com.google.gms.google-services'

Removing this resolved the issue

Python Pandas - Find difference between two data frames

By using drop_duplicates

pd.concat([df1,df2]).drop_duplicates(keep=False)

Update :

Above method only working for those dataframes they do not have duplicate itself, For example

df1=pd.DataFrame({'A':[1,2,3,3],'B':[2,3,4,4]})
df2=pd.DataFrame({'A':[1],'B':[2]})

It will output like below , which is wrong

Wrong Output :

pd.concat([df1, df2]).drop_duplicates(keep=False)
Out[655]: 
   A  B
1  2  3

Correct Output

How to achieve that?

Method 1: Using isin with tuple

df1[~df1.apply(tuple,1).isin(df2.apply(tuple,1))]
Out[657]: 
   A  B
1  2  3
2  3  4
3  3  4

Method 2: merge with indicator

df1.merge(df2,indicator = True, how='left').loc[lambda x : x['_merge']!='both']
Out[421]: 
   A  B     _merge
1  2  3  left_only
2  3  4  left_only
3  3  4  left_only

How do I deal with installing peer dependencies in Angular CLI?

You can ignore the peer dependency warnings by using the --force flag with Angular cli when updating dependencies.

ng update @angular/cli @angular/core --force

For a full list of options, check the docs: https://angular.io/cli/update

Failed linking file resources

Run ./gradlew build -stacktrace in Android Studio terminal. It helps you to find a file that causes this error.

How to Set/Update State of StatefulWidget from other StatefulWidget in Flutter?

I would like to extend Mohamed Elrashid answer, in case you require to pass a variable from the child widget to the parent widget

On child widget:

class ChildWidget extends StatefulWidget {
  final Function() notifyParent;
  ChildWidget({Key key, @required this.notifyParent}) : super(key: key);
}

On parent widget

void refresh(dynamic childValue) {
  setState(() {
    _parentVariable = childValue;
  });
}

On parent widget: pass the function above to the child widget

new ChildWidget( notifyParent: refresh );

On child widget: call the parent function with any variable from the the child widget

widget.notifyParent(childVariable);

ASP.NET Core - Swashbuckle not creating swagger.json file

I don't know if this is useful for someone, but in my case the problem was that the name had different casing.

V1 in the service configuration - V capital letter
v1 in Settings -- v lower case

The only thing I did was to use the same casing and it worked.

ReferenceError: fetch is not defined

For those also using typescript on node-js and are getting a ReferenceError: fetch is not defined error

npm install these packages:

    "amazon-cognito-identity-js": "3.0.11"
    "node-fetch": "^2.3.0"

Then include:

import Global = NodeJS.Global;
export interface GlobalWithCognitoFix extends Global {
    fetch: any
}
declare const global: GlobalWithCognitoFix;
global.fetch = require('node-fetch');

Anaconda / Python: Change Anaconda Prompt User Path

If you want to access folder you specified using Anaconda Prompt, try typing

cd C:\Users\u354590

document.getElementById replacement in angular4 / typescript?

You can just inject the DOCUMENT token into the constructor and use the same functions on it

import { Inject }  from '@angular/core';
import { DOCUMENT } from '@angular/common'; 

@Component({...})
export class AppCmp {
   constructor(@Inject(DOCUMENT) document) {
      document.getElementById('el');
   }
}

Or if the element you want to get is in that component, you can use template references.

How to iterate using ngFor loop Map containing key as string and values as map iteration

This is because map.keys() returns an iterator. *ngFor can work with iterators, but the map.keys() will be called on every change detection cycle, thus producing a new reference to the array, resulting in the error you see. By the way, this is not always an error as you would traditionally think of it; it may even not break any of your functionality, but suggests that you have a data model which seems to behave in an insane way - changing faster than the change detector checks its value.

If you do no want to convert the map to an array in your component, you may use the pipe suggested in the comments. There is no other workaround, as it seems.

P.S. This error will not be shown in the production mode, as it is more like a very strict warning, rather than an actual error, but still, this is not a good idea to leave it be.

Read response headers from API response - Angular 5 + TypeScript

You should use the new HttpClient. You can find more information here.

http
  .get<any>('url', {observe: 'response'})
  .subscribe(resp => {
    console.log(resp.headers.get('X-Token'));
  });

How to add icon to mat-icon-button

Just add the <mat-icon> inside mat-button or mat-raised-button. See the example below. Note that I am using material icon instead of your svg for demo purpose:

<button mat-button>
    <mat-icon>mic</mat-icon>
    Start Recording
</button>

<button mat-raised-button color="accent">
    <mat-icon>mic</mat-icon>
    Start Recording
</button>

Here is a link to stackblitz demo.

'mat-form-field' is not a known element - Angular 5 & Material2

You're only exporting it in your NgModule, you need to import it too

@NgModule({
  imports: [
    MatButtonModule,
    MatFormFieldModule,
    MatInputModule,
    MatRippleModule,
 ]
  exports: [
    MatButtonModule,
    MatFormFieldModule,
    MatInputModule,
    MatRippleModule,
  ],
  declarations: [
    SearchComponent,
  ],
})export class MaterialModule {};

better yet

const modules = [
        MatButtonModule,
        MatFormFieldModule,
        MatInputModule,
        MatRippleModule
];

@NgModule({
  imports: [...modules],
  exports: [...modules]
  ,
})export class MaterialModule {};

update

You're declaring component (SearchComponent) depending on Angular Material before all Angular dependency are imported

Like BrowserAnimationsModule

Try moving it to MaterialModule, or before it

ng serve not detecting file changes automatically

I was having this problem on a new Linux Ubuntu install and noticed I was getting an error about 'too many watchers for limit' in VSCode at the same time. I followed the instructions to fix it in VSCode and it also fixed the issue with ng watch. More info here https://code.visualstudio.com/docs/setup/linux#_visual-studio-code-is-unable-to-watch-for-file-changes-in-this-large-workspace-error-enospc

I noticed people suggesting sudo to run watch. This is a dangerous game, you are giving npm packages root access to your system. If your permissions are correct, my issue could be your fix since the limit is per user, and by running as sudo, you are running as root instead of your current user that is past the limit (running a watch heavy ide like vscode or atom on ). If for some reason you have the wrong permissions, set them properly to your user / group with chown.

Docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock

Success for me

sudo usermod -a -G docker $USER
reboot

axios post request to send form data

Upload (multiple) binary files

Node.js

Things become complicated when you want to post files via multipart/form-data, especially multiple binary files. Below is a working example:

const FormData = require('form-data')
const fs = require('fs')
const path = require('path')

const formData = new FormData()
formData.append('files[]', JSON.stringify({ to: [{ phoneNumber: process.env.RINGCENTRAL_RECEIVER }] }), 'test.json')
formData.append('files[]', fs.createReadStream(path.join(__dirname, 'test.png')), 'test.png')
await rc.post('/restapi/v1.0/account/~/extension/~/fax', formData, {
  headers: formData.getHeaders()
})

Instead of headers: {'Content-Type': 'multipart/form-data' } I prefer headers: formData.getHeaders()
I use async and await above, you can change them to plain Promise statements if you don't like them
In order to add your own headers, you just headers: { ...yourHeaders, ...formData.getHeaders() }

Newly added content below:

Browser

Browser's FormData is different from the NPM package 'form-data'. The following code works for me in browser:

HTML:

<input type="file" id="image" accept="image/png"/>

JavaScript:

const formData = new FormData()

// add a non-binary file
formData.append('files[]', new Blob(['{"hello": "world"}'], { type: 'application/json' }), 'request.json')

// add a binary file
const element = document.getElementById('image')
const file = element.files[0]
formData.append('files[]', file, file.name)
await rc.post('/restapi/v1.0/account/~/extension/~/fax', formData)

Angular Material: mat-select not selecting default

Try this!

this.selectedObjectList = [{id:1}, {id:2}, {id:3}]
this.allObjectList = [{id:1}, {id:2}, {id:3}, {id:4}, {id:5}]
let newList = this.allObjectList.filter(e => this.selectedObjectList.find(a => e.id == a.id))
this.selectedObjectList = newList

How can I fix "Design editor is unavailable until a successful build" error?

None of the above worked for me. what worked for me is to go to File -> Invalidate Caches / Restart

INSTALL_FAILED_USER_RESTRICTED : android studio using redmi 4 device

In your mobile device,make sure you have enabled the following buttons.

Settings > Additional Settings > Developer options

Install via USB
USB Debugging (Security settings)

No provider for HttpClient

Add HttpModule and HttpClientModule in both imports and providers in app.module.ts solved the issue. imports -> import {HttpModule} from "@angular/http"; import {HttpClientModule} from "@angular/common/http";

ReactJS and images in public folder

the react docs explain this nicely in the documentation, you have to use process.env.PUBLIC_URL with images placed in the public folder. See here for more info

return <img src={process.env.PUBLIC_URL + '/img/logo.png'} />;

I get "Http failure response for (unknown url): 0 Unknown Error" instead of actual error message in Angular

Add This Codes in your connection file

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: PUT,GET,POST,DELETE");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");

Why AVD Manager options are not showing in Android Studio

It happens when there is no runnable module for Android App in your project. Creating new project definitely solves this.

You can check this using Run > Edit Configurations > Adding Android App. If there is not runnable Android App module then you can't see "AVD Manager" in the menu.

How to remove an unpushed outgoing commit in Visual Studio?

Assuming you have pushed most recent changes to the server:

Close Visual Studio and delete your local copy of the project
Open Visual Studio, go to Team Explorer tab, click Manage Connections. (plug)
Click the dropdown arrow next to Manage Connections, Connect to a Project
Select the project, confirm the local path, and click the Connect button.

Once you reopen the project both commits and changes should be zero.

How to work with progress indicator in flutter?

Create a bool isLoading and set it to false. With the help of ternary operator, When user clicks on login button set state of isLoading to true. You will get circular loading indicator in place of login button

 isLoading ? new PrimaryButton(
                      key: new Key('login'),
                      text: 'Login',
                      height: 44.0,
                      onPressed: setState((){isLoading = true;}))
                  : Center(
                      child: CircularProgressIndicator(),
                    ),

You can see Screenshots how it looks while before login is clicked

After login is clicked

In mean time you can run login process and login user. If user credentials are wrong then again you will setState of isLoading to false, such that loading indicator will become invisible and login button visible to user. By the way, primaryButton used in code is my custom button. You can do same with OnPressed in button.

How to import JSON File into a TypeScript file?

Here is complete answer for Angular 6+ based on @ryanrain answer:

From angular-cli doc, json can be considered as assets and accessed from standard import without use of ajax request.

Let's suppose you add your json files into "your-json-dir" directory:

add "your-json-dir" into angular.json file (:

"assets": [ "src/assets", "src/your-json-dir" ]
create or edit typings.d.ts file (at your project root) and add the following content:

declare module "*.json" { const value: any; export default value; }

This will allow import of ".json" modules without typescript error.
in your controller/service/anything else file, simply import the file by using this relative path:

import * as myJson from 'your-json-dir/your-json-file.json';

How to convert column with string type to int form in pyspark data frame?

from pyspark.sql.types import IntegerType
data_df = data_df.withColumn("Plays", data_df["Plays"].cast(IntegerType()))
data_df = data_df.withColumn("drafts", data_df["drafts"].cast(IntegerType()))

You can run loop for each column but this is the simplest way to convert string column into integer.

How to solve npm install throwing fsevents warning on non-MAC OS?

Instead of using --no-optional every single time, we can just add it to npm or yarn config.

For Yarn, there is a default no-optional config, so we can just edit that:

yarn config set ignore-optional true

For npm, there is no default config set, so we can create one:

npm config set ignore-optional true

How to add a new project to Github using VS Code

Here are the detailed steps needed to achieve this.

The existing commands can be simply run via the CLI terminal of VS-CODE. It is understood that Git is installed in the system, configured with desired username and email Id.

1) Navigate to the local project directory and create a local git repository:

 git init

2) Once that is successful, click on the 'Source Control' icon on the left navbar in VS-Code.One should be able to see files ready to be commit-ed. Press on 'Commit' button, provide comments, stage the changes and commit the files. Alternatively you can run from CLI

git commit -m "Your comment"

3) Now you need to visit your GitHub account and create a new Repository. Exclude creating 'README.md', '.gitIgnore' files. Also do not add any License to the repo. Sometimes these settings cause issue while pushing in.

4) Copy the link to this newly created GitHub Repository.

5) Come back to the terminal in VS-CODE and type these commands in succession:

git remote add origin <Link to GitHub Repo>     //maps the remote repo link to local git repo

git remote -v                                  //this is to verify the link to the remote repo 

git push -u origin master                      // pushes the commit-ed changes into the remote repo

Note: If it is the first time the local git account is trying to connect to GitHub, you may be required to enter credentials to GitHub in a separate window.

6) You can see the success message in the Terminal. You can also verify by refreshing the GitHub repo online.

Hope this helps

Get safe area inset top and bottom heights

None of the other answers here worked for me, but this did.

var topSafeAreaHeight: CGFloat = 0
var bottomSafeAreaHeight: CGFloat = 0

  if #available(iOS 11.0, *) {
    let window = UIApplication.shared.windows[0]
    let safeFrame = window.safeAreaLayoutGuide.layoutFrame
    topSafeAreaHeight = safeFrame.minY
    bottomSafeAreaHeight = window.frame.maxY - safeFrame.maxY
  }

.net Core 2.0 - Package was restored using .NetFramework 4.6.1 instead of target framework .netCore 2.0. The package may not be fully compatible

That particular package does not include assemblies for dotnet core, at least not at present. You may be able to build it for core yourself with a few tweaks to the project file, but I can't say for sure without diving into the source myself.

Codesign wants to access key "access" in your keychain, I put in my login password but keeps asking me

Enter your login password, and select always allow, to avoid typing in your password multiple times.

Angular: Cannot Get /

I was referring to one of my provider with two different casing. One of them was wrong but only the webpack compiler was complaining. I had to step into the ClientApp folder and use ng build or ng serve to see the errors. (ASP.NET Core SPA with Angular 5)

phpMyAdmin ERROR: mysqli_real_connect(): (HY000/1045): Access denied for user 'pma'@'localhost' (using password: NO)

Add this line to the file xampp\phpMyAdmin\config.inc:

$cfg['Servers'][$i]['port'] = '3307';

Here, my port is 3307, you can change it to yours.

Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

You should make sure your test case function is public rather than private to make it accessible by Test Runner.

@Test
private void testmethod(){}

@Test
public void testmethod(){}

How to sign in kubernetes dashboard?

All the previous answers are good to me. But a straight forward answer on my side would come from https://github.com/kubernetes/dashboard/wiki/Creating-sample-user#bearer-token. Just use kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}'). You will have many values for some keys (Name, Namespace, Labels, ..., token). The most important is the token that corresponds to your name. copy that token and paste it in the token box. Hope this helps.

How to import cv2 in python3?

The best way is to create a virtual env. first and then do pip install , everything will work fine

MongoError: connect ECONNREFUSED 127.0.0.1:27017

For Windows users.

This happens because the MondgDB server is stopped. to fix this you can,

1 search for Services ,for that search using the left bottom corner search option.

2 then there is a gear icon named with 'Services'.

3 after clicking that you will get a window with lot of services

4 scroll down and you will find 'MongoDB server (MongoDB)'.

5 so you will see that there is an option to start the service.

6 start it.
1 then open your command prompt.

2 type mongod

now you can connect to your server.

this steps also working fine if your sql server service down. (find sql server services)

Can't create project on Netbeans 8.2

EDIT: The solution is to install JDK 8, as JDK 9 and beyond are currently not supported.

If however, you already have installed JDK 8, then kindly follow the steps outlined below.

The reason is that there is a conflict with the base JDK that NetBeans starts with. You have to set it to a lower version.

Go to the folder "C:\Program Files\NetBeans 8.2\etc", or wherever NetBeans is installed.
Open the netbeans.conf file.
Locate netbeans_jdkhome and replace the JDK path there with "C:\Program Files\Java\jdk1.8.0_152", or wherever your JDK is installed. Be sure to use the right path, or you will run into problems. Here, JDK 1.8.0_152 is installed.
Save the file, and restart NetBeans. It worked for me, should do for you too.

Ajax LARAVEL 419 POST error

You may also get that error when CSRF "token" for the active user session is out of date, even if the token was specified in ajax request.

How to see local history changes in Visual Studio Code?

I built an extension called Checkpoints, an alternative to Local History. Checkpoints has support for viewing history for all files (that has checkpoints) in the tree view, not just the currently active file. There are some other minor differences aswell, but overall they are pretty similar.

TypeScript error TS1005: ';' expected (II)

If you're getting error TS1005: 'finally' expected., it means you forgot to implement catch after try. Generally, it means the syntax you attempted to use was incorrect.

How to view Plugin Manager in Notepad++

The way to install plugins seems to have changed, the previous answers here did not work for me.

The current (checked with 7.8.1) way to install plugins is to install it in a sub folder:

The plugin (in the DLL form) should be placed in the plugins subfolder of the Notepad++ Install Folder, under the subfolder with the same name of plugin binary name without file extension. For example, if the plugin you want to install named myAwesomePlugin.dll, you should install it with the following path: %PROGRAMFILES(x86)%\Notepad++\plugins\myAwesomePlugin\myAwesomePlugin.dll

from https://npp-user-manual.org/docs/plugins/

So PluginManager.dll goes into PluginManager sub folder.

Set cookies for cross origin requests

What you need to do

To allow receiving & sending cookies by a CORS request successfully, do the following.

Back-end (server): Set the HTTP header Access-Control-Allow-Credentials value to true. Also, make sure the HTTP headers Access-Control-Allow-Origin and Access-Control-Allow-Headers are set and not with a wildcard *.

Recommended Cookie settings per Chrome and Firefox update in 2021: SameSite=None and Secure. See MDN documentation

For more info on setting CORS in express js read the docs here

Front-end (client): Set the XMLHttpRequest.withCredentials flag to true, this can be achieved in different ways depending on the request-response library used:

jQuery 1.5.1 xhrFields: {withCredentials: true}
ES6 fetch() credentials: 'include'
axios: withCredentials: true

Or

Avoid having to use CORS in combination with cookies. You can achieve this with a proxy.

If you for whatever reason don't avoid it. The solution is above.

It turned out that Chrome won't set the cookie if the domain contains a port. Setting it for localhost (without port) is not a problem. Many thanks to Erwin for this tip!

intellij idea - Error: java: invalid source release 1.9

I also had the same problem in IntellijIdea, after selecting the project, then File > ProjectStructure > ProjectSettings > Modules -> sources the option was showing - the Language Level set at 9:

So, I Just change it to 8. Still my issue didn't got resolve.

The main issue was with pom.xml. I reimported the pom.xml file and my issue got resolved.

So, whenever you changed the pom.xml file, IDEA needs to update the project structure. For example if you've added there some more dependencies, IDEA needs to add them as project libraries.

In "Settings > Build, Execution, Deployment > Build Tools > Maven > Importing" you can choose "Import Maven projects automatically". This will automatically invoke "Reimport" action when the pom.xml is changed.

enter image description here

Iterate over array of objects in Typescript

You can use the built-in forEach function for arrays.

Like this:

//this sets all product descriptions to a max length of 10 characters
data.products.forEach( (element) => {
    element.product_desc = element.product_desc.substring(0,10);
});

Your version wasn't wrong though. It should look more like this:

for(let i=0; i<data.products.length; i++){
    console.log(data.products[i].product_desc); //use i instead of 0
}

npm WARN ... requires a peer of ... but none is installed. You must install peer dependencies yourself

In my case following commands worked for me:

sudo npm cache clean --force
sudo npm install -g npm


sudo apt install libssl1.0-dev
sudo apt install nodejs-dev
sudo apt install node-gyp
sudo apt install npm

After that if you are facing "Cannot find module 'bcrypt' then for that you can resolve this one with below commands:

npm install node-gyp -g
npm install bcrypt -g
npm install bcrypt --save

Hope it will work for you as well.

webpack: Module not found: Error: Can't resolve (with relative path)

If you have a typescript file, you have to instruct the webpack to resolve them by using below code in webpack.config.js

module.exports={
   ...
   resolve:{
      extensions:['.ts','.tsx';]
   }
}

Fixing a systemd service 203/EXEC failure (no such file or directory)

I ran across a Main process exited, code=exited, status=203/EXEC today as well and my bug was that I forgot to add the executable bit to the file.

Django - Reverse for '' not found. '' is not a valid view function or pattern name

Fix urlpatterns in urls.py file

For example, my app name is "simulator",

My URL pattern for login and logout looks like

urlpatterns = [
    ...
    ...
    url(r'^login/$', simulator.views.login_view, name="login"),
    url(r'^logout/$', simulator.views.logout_view, name="logout"),
    ...
    ...

]

Angular4 - No value accessor for form control

For me it was due to "multiple" attribute on select input control as Angular has different ValueAccessor for this type of control.

const countryControl = new FormControl();

And inside template use like this

    <select multiple name="countries" [formControl]="countryControl">
      <option *ngFor="let country of countries" [ngValue]="country">
       {{ country.name }}
      </option>
    </select>

More details ref Official Docs

bash: npm: command not found?

I am following the same tuturial and I had this issue and how I solved is just download the

8.11.4 LTS version

from this link then install it then the command worked just fine!

npm WARN enoent ENOENT: no such file or directory, open 'C:\Users\Nuwanst\package.json'

Delete package.json and package-lock.json file

Then type npm init

after that type npm install socket.io --save

finally type npm install

It works for me

Getting Image from API in Angular 4/5+?

There is no need to use angular http, you can get with js native functions

_x000D_

// you will ned this function to fetch the image blob._x000D_
async function getImage(url, fileName) {_x000D_
     // on the first then you will return blob from response_x000D_
    return await fetch(url).then(r => r.blob())_x000D_
    .then((blob) => { // on the second, you just create a file from that blob, getting the type and name that intend to inform_x000D_
         _x000D_
        return new File([blob], fileName+'.'+   blob.type.split('/')[1]) ;_x000D_
    });_x000D_
}_x000D_
_x000D_
// example url_x000D_
var url = 'https://img.freepik.com/vetores-gratis/icone-realista-quebrado-vidro-fosco_1284-12125.jpg';_x000D_
_x000D_
// calling the function_x000D_
getImage(url, 'your-name-image').then(function(file) {_x000D_
_x000D_
    // with file reader you will transform the file in a data url file;_x000D_
    var reader = new FileReader();_x000D_
    reader.readAsDataURL(file);_x000D_
    reader.onloadend = () => {_x000D_
    _x000D_
    // just putting the data url to img element_x000D_
        document.querySelector('#image').src = reader.result ;_x000D_
    }_x000D_
})

_x000D_

<img src="" id="image"/>

_x000D_

Is there a Google Sheets formula to put the name of the sheet into a cell?

if you want to use build-in functions:

=REGEXEXTRACT(cell("address";'Sheet1'!A1);"^'(.*)'!\$A\$1$")

Explanation: cell("address";'Sheet1'!A1) gives you the address of the sheet, output is 'Sheet1'!$A$1. Now we need to extract the actual sheet name from this output. I'm using REGEXEXTRACT to match it by regex ^'(.*)'!\$A\$1$, but you can either use more/less specific regex or use functions like SUBSTITUTE or REPLACE

Typescript Date Type?

Typescript recognizes the Date interface out of the box - just like you would with a number, string, or custom type. So Just use:

myDate : Date;

How to perform string interpolation in TypeScript?

In JavaScript you can use template literals:

let value = 100;
console.log(`The size is ${ value }`);

Refused to load the font 'data:font/woff.....'it violates the following Content Security Policy directive: "default-src 'self'". Note that 'font-src'

I was facing similar issue.

You need to remove all the CSP parameter which are picked up by default and understand why each attribute is required.

font-src - is to tell the browser to load the font's from src which is specified after that. font-src: 'self' - this tells to load font family within the same origin or system. font-src: 'self' data: - this tells load font-family within the same origin and the calls made to get data:

You might also get warning "** Failed to decode downloaded font, OTS parsing error: invalid version tag **" Add the following entry in CSP.

font-src: 'self' font

This should now load with no errors.

Typescript empty object for a typed variable

If you declare an empty object literal and then assign values later on, then you can consider those values optional (may or may not be there), so just type them as optional with a question mark:

type User = {
    Username?: string;
    Email?: string;
}

How to format JSON in notepad++

Try with JSToolNpp and follow the snap like this then Plugins | JSTool | JSFormat.

convert array into DataFrame in Python

You can add parameter columns or use dict with key which is converted to column name:

np.random.seed(123)
e = np.random.normal(size=10)  
dataframe=pd.DataFrame(e, columns=['a']) 
print (dataframe)
          a
0 -1.085631
1  0.997345
2  0.282978
3 -1.506295
4 -0.578600
5  1.651437
6 -2.426679
7 -0.428913
8  1.265936
9 -0.866740

e_dataframe=pd.DataFrame({'a':e}) 
print (e_dataframe)
          a
0 -1.085631
1  0.997345
2  0.282978
3 -1.506295
4 -0.578600
5  1.651437
6 -2.426679
7 -0.428913
8  1.265936
9 -0.866740

Constraint Layout Vertical Align Center

You can easily center multiple things by creating a chain. It works both vertically and horizontally

Link to official documentation about chains

Edit to answer comment :

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
    <TextView
        android:id="@+id/first_score"
        android:layout_width="60dp"
        android:layout_height="wrap_content"
        android:text="10"
        app:layout_constraintEnd_toStartOf="@+id/second_score"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/second_score"
        app:layout_constraintBottom_toTopOf="@+id/subtitle"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintVertical_chainStyle="packed"
        android:gravity="center"
        />
    <TextView
        android:id="@+id/subtitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Subtitle"
        app:layout_constraintTop_toBottomOf="@+id/first_score"
        app:layout_constraintBottom_toBottomOf="@+id/second_score"
        app:layout_constraintStart_toStartOf="@id/first_score"
        app:layout_constraintEnd_toEndOf="@id/first_score"
        />
    <TextView
        android:id="@+id/second_score"
        android:layout_width="60dp"
        android:layout_height="120sp"
        android:text="243"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/thrid_score"
        app:layout_constraintStart_toEndOf="@id/first_score"
        app:layout_constraintTop_toTopOf="parent"
        android:gravity="center"
        />
    <TextView
        android:id="@+id/thrid_score"
        android:layout_width="60dp"
        android:layout_height="wrap_content"
        android:text="3200"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/second_score"
        app:layout_constraintTop_toTopOf="@id/second_score"
        app:layout_constraintBottom_toBottomOf="@id/second_score"
        android:gravity="center"
        />
</android.support.constraint.ConstraintLayout>

You have the horizontal chain : first_score <=> second_score <=> third_score. second_score is centered vertically. The other scores are centered vertically according to it.

You can definitely create a vertical chain first_score <=> subtitle and center it according to second_score

Edit seaborn legend

If legend_out is set to True then legend is available thought g._legend property and it is a part of a figure. Seaborn legend is standard matplotlib legend object. Therefore you may change legend texts like:

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = True)

# title
new_title = 'My title'
g._legend.set_title(new_title)
# replace labels
new_labels = ['label 1', 'label 2']
for t, l in zip(g._legend.texts, new_labels): t.set_text(l)

sns.plt.show()

Another situation if legend_out is set to False. You have to define which axes has a legend (in below example this is axis number 0):

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = False)

# check axes and find which is have legend
leg = g.axes.flat[0].get_legend()
new_title = 'My title'
leg.set_title(new_title)
new_labels = ['label 1', 'label 2']
for t, l in zip(leg.texts, new_labels): t.set_text(l)
sns.plt.show()

Moreover you may combine both situations and use this code:

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = True)

# check axes and find which is have legend
for ax in g.axes.flat:
    leg = g.axes.flat[0].get_legend()
    if not leg is None: break
# or legend may be on a figure
if leg is None: leg = g._legend

# change legend texts
new_title = 'My title'
leg.set_title(new_title)
new_labels = ['label 1', 'label 2']
for t, l in zip(leg.texts, new_labels): t.set_text(l)

sns.plt.show()

This code works for any seaborn plot which is based on Grid class.

How do I update Anaconda?

If you have trouble to get e.g. from 3.3.x to 4.x (conda update conda "does not work" to get to the next version) than try it more specific like so:

conda install conda=4.0 (or conda install anaconda=4.0)

https://www.anaconda.com/blog/developer-blog/anaconda-4-release/

You should know what you do, because conda could break due to the forced installation. If you would like to get more flexibility/security you could use pkg-manager like nix(-pkgs) [with nix-shell] / NixOS.

How to import Angular Material in project?

UPDATE for Angular 9.0.1

Since this version there is no barrel file for massive exports in the root index.d.ts. The assets imports should be:

import { NgModule } from '@angular/core';
import { MatCardModule } from '@angular/material/card';
import { MatButtonModule} from '@angular/material/button';
import { MatMenuModule } from '@angular/material/menu';
import { MatToolbarModule } from '@angular/material/toolbar';
import { MatIconModule } from '@angular/material/icon';

import {
  MatButtonModule,
  MatMenuModule,
  MatToolbarModule,
  MatIconModule,
  MatCardModule
} from '@angular/material';

@NgModule({
  imports: [
    MatButtonModule,
    MatMenuModule,
    MatToolbarModule,
    MatIconModule,
    MatCardModule
  ],
  exports: [
    MatButtonModule,
    MatMenuModule,
    MatToolbarModule,
    MatIconModule,
    MatCardModule
  ]
})
export class MaterialModule {}

source: @angular/material/index.d.ts' is not a module

MaterialModule was depreciated in version 2.0.0-beta.3 and it has been removed completely in version 2.0.0-beta.11. See this CHANGELOG for more details. Please go through the breaking changes.

Breaking changes

Angular Material now requires Angular 4.4.3 or greater
MaterialModule has been removed.
For beta.11, we've made the decision to deprecate the "md" prefix completely and use "mat" moving forward.

Please go through CHANGELOG we will get more answer!

Example shown below cmd

npm install --save @angular/material @angular/animations @angular/cdk
npm install --save angular/material2-builds angular/cdk-builds

Create file (material.module.ts) inside the 'app' folder

import { NgModule } from '@angular/core';

import {
  MatButtonModule,
  MatMenuModule,
  MatToolbarModule,
  MatIconModule,
  MatCardModule
} from '@angular/material';

@NgModule({
  imports: [
    MatButtonModule,
    MatMenuModule,
    MatToolbarModule,
    MatIconModule,
    MatCardModule
  ],
  exports: [
    MatButtonModule,
    MatMenuModule,
    MatToolbarModule,
    MatIconModule,
    MatCardModule
  ]
})
export class MaterialModule {}

import on app.module.ts

import { MaterialModule } from './material.module';

Your component html file

<div>
  <mat-toolbar color="primary">
    <span><mat-icon>mood</mat-icon></span>

    <span>Yay, Material in Angular 2!</span>

    <button mat-icon-button [mat-menu-trigger-for]="menu">
      <mat-icon>more_vert</mat-icon>
    </button>
  </mat-toolbar>
  <mat-menu x-position="before" #menu="matMenu">
    <button mat-menu-item>Option 1</button>
    <button mat-menu-item>Option 2</button>
  </mat-menu>

  <mat-card>
    <button mat-button>All</button>
    <button mat-raised-button>Of</button>
    <button mat-raised-button color="primary">The</button>
    <button mat-raised-button color="accent">Buttons</button>
  </mat-card>

  <span class="done">
    <button mat-fab>
      <mat-icon>check circle</mat-icon>
    </button>
  </span>
</div>

Add global css 'style.css'

@import 'https://fonts.googleapis.com/icon?family=Material+Icons';
@import '~@angular/material/prebuilt-themes/indigo-pink.css';

Your component css

body {
  margin: 0;
  font-family: Roboto, sans-serif;
}

mat-card {
  max-width: 80%;
  margin: 2em auto;
  text-align: center;
}

mat-toolbar-row {
  justify-content: space-between;
}

.done {
  position: fixed;
  bottom: 20px;
  right: 20px;
  color: white;
}

If any one didn't get output use below instruction

instead of above interface (material.module.ts) u can directly use below code also in the app.module.ts.

import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MdButtonModule, MdCardModule, MdMenuModule, MdToolbarModule, MdIconModule, MatAutocompleteModule, MatInputModule,MatFormFieldModule } from '@angular/material';

So this case u don't want to import

import { MaterialModule } from './material.module';

in the app.module.ts

Specifying onClick event type with Typescript and React.Konva

As posted in my update above, a potential solution would be to use Declaration Merging as suggested by @Tyler-sebastion. I was able to define two additional interfaces and add the index property on the EventTarget in this way.

interface KonvaTextEventTarget extends EventTarget {
  index: number
}

interface KonvaMouseEvent extends React.MouseEvent<HTMLElement> {
  target: KonvaTextEventTarget
}

I then can declare the event as KonvaMouseEvent in my onclick MouseEventHandler function.

onClick={(event: KonvaMouseEvent) => {
          makeMove(ownMark, event.target.index)
}}

I'm still not 100% if this is the best approach as it feels a bit Kludgy and overly verbose just to get past the tslint error.

No signing certificate "iOS Distribution" found

Double click and install the production certificate in your key chain. This might resolve the issue.

Why does "npm install" rewrite package-lock.json?

Use the npm ci command instead of npm install.

"ci" stands for "continuous integration".

It will install the project dependencies based on the package-lock.json file instead of the lenient package.json file dependencies.

It will produce identical builds to your team mates and it is also much faster.

You can read more about it in this blog post: https://blog.npmjs.org/post/171556855892/introducing-npm-ci-for-faster-more-reliable

iOS 11, 12, and 13 installed certificates not trusted automatically (self signed)

If you are not seeing the certificate under General->About->Certificate Trust Settings, then you probably do not have the ROOT CA installed. Very important -- needs to be a ROOT CA, not an intermediary CA.

I just answered a question here explaining how to obtain the ROOT CA and get things to show up: How to install self-signed certificates in iOS 11

How to convert Observable<any> to array[]

You will need to subscribe to your observables:

this.CountryService.GetCountries()
    .subscribe(countries => {
        this.myGridOptions.rowData = countries as CountryData[]
    })

And, in your html, wherever needed, you can pass the async pipe to it.

Selection with .loc in python

Whenever slicing (a:n) can be used, it can be replaced by fancy indexing (e.g. [a,b,c,...,n]). Fancy indexing is nothing more than listing explicitly all the index values instead of specifying only the limits.
Whenever fancy indexing can be used, it can be replaced by a list of Boolean values (a mask) the same size than the index. The value will be True for index values that would have been included in the fancy index, and False for the values that would have been excluded. It's another way of listing some index values, but which can be easily automated in NumPy and Pandas, e.g by a logical comparison (like in your case).

The second replacement possibility is the one used in your example. In:

iris_data.loc[iris_data['class'] == 'versicolor', 'class'] = 'Iris-versicolor'

the mask

iris_data['class'] == 'versicolor'

is a replacement for a long and silly fancy index which would be list of row numbers where class column (a Series) has the value versicolor.

Whether a Boolean mask appears within a .iloc or .loc (e.g. df.loc[mask]) indexer or directly as the index (e.g. df[mask]) depends on wether a slice is allowed as a direct index. Such cases are shown in the following indexer cheat-sheet:

^{Pandas indexers loc and iloc cheat-sheet}

How to add empty spaces into MD markdown readme on GitHub?

Instead of using HTML entities like   and &emsp; (as others have suggested), you can use the Unicode em space (8195 in UTF-8) directly. Try copy-pasting the following into your README.md. The spaces at the start of the lines are em spaces.

The action of every agent <br />
  into the world <br />
starts <br />
  from their physical selves. <br />

Cloning an array in Javascript/Typescript

Using map or other similar solution do not help to clone deeply an array of object. An easier way to do this without adding a new library is using JSON.stringfy and then JSON.parse.

In your case this should work :

this.backupData = JSON.parse(JSON.stringify(genericItems));

When using the last version of JS/TS, installing a large library like lodash for just one/two function is a bad move. You will heart your app performance and in the long run you will have to maintain the library upgrades! check https://bundlephobia.com/[email protected]
For small objet lodash cloneDeep can be faster but for larger/deeper object json clone become faster. So in this cases you should not hesitate to use it. check https://www.measurethat.net/Benchmarks/Show/6039/0/lodash-clonedeep-vs-json-clone-larger-object and for infos https://v8.dev/blog/cost-of-javascript-2019#json
The inconvenient is that your source object must be convertible to JSON.

EF Core add-migration Build Failed

I was struggling with this one while using Visual Studio 2019 version 16.5.0.

What solved it finally:

Close Visual Studio;
Reopen Visual Studio;
Make sure you right click the Solution if you have multiple projects and select Rebuild Solution.

Note that I tried doing a Rebuild Solution before and that did not catch the error. So it's important to close VS and reopen it.

It then showed the error that was causing add-migration command to fail with Build failed message.

Keras input explanation: input_shape, units, batch_size, dim, etc

Units:

The amount of "neurons", or "cells", or whatever the layer has inside it.

It's a property of each layer, and yes, it's related to the output shape (as we will see later). In your picture, except for the input layer, which is conceptually different from other layers, you have:

Hidden layer 1: 4 units (4 neurons)
Hidden layer 2: 4 units
Last layer: 1 unit

Shapes

Shapes are consequences of the model's configuration. Shapes are tuples representing how many elements an array or tensor has in each dimension.

Ex: a shape (30,4,10) means an array or tensor with 3 dimensions, containing 30 elements in the first dimension, 4 in the second and 10 in the third, totaling 30*4*10 = 1200 elements or numbers.

The input shape

What flows between layers are tensors. Tensors can be seen as matrices, with shapes.

In Keras, the input layer itself is not a layer, but a tensor. It's the starting tensor you send to the first hidden layer. This tensor must have the same shape as your training data.

Example: if you have 30 images of 50x50 pixels in RGB (3 channels), the shape of your input data is (30,50,50,3). Then your input layer tensor, must have this shape (see details in the "shapes in keras" section).

Each type of layer requires the input with a certain number of dimensions:

Dense layers require inputs as (batch_size, input_size)
- or (batch_size, optional,...,optional, input_size)
2D convolutional layers need inputs as:
- if using channels_last: (batch_size, imageside1, imageside2, channels)
- if using channels_first: (batch_size, channels, imageside1, imageside2)
1D convolutions and recurrent layers use (batch_size, sequence_length, features)
- Details on how to prepare data for recurrent layers

Now, the input shape is the only one you must define, because your model cannot know it. Only you know that, based on your training data.

All the other shapes are calculated automatically based on the units and particularities of each layer.

Relation between shapes and units - The output shape

Given the input shape, all other shapes are results of layers calculations.

The "units" of each layer will define the output shape (the shape of the tensor that is produced by the layer and that will be the input of the next layer).

Each type of layer works in a particular way. Dense layers have output shape based on "units", convolutional layers have output shape based on "filters". But it's always based on some layer property. (See the documentation for what each layer outputs)

Let's show what happens with "Dense" layers, which is the type shown in your graph.

A dense layer has an output shape of (batch_size,units). So, yes, units, the property of the layer, also defines the output shape.

Hidden layer 1: 4 units, output shape: (batch_size,4).
Hidden layer 2: 4 units, output shape: (batch_size,4).
Last layer: 1 unit, output shape: (batch_size,1).

Weights

Weights will be entirely automatically calculated based on the input and the output shapes. Again, each type of layer works in a certain way. But the weights will be a matrix capable of transforming the input shape into the output shape by some mathematical operation.

In a dense layer, weights multiply all inputs. It's a matrix with one column per input and one row per unit, but this is often not important for basic works.

In the image, if each arrow had a multiplication number on it, all numbers together would form the weight matrix.

Shapes in Keras

Earlier, I gave an example of 30 images, 50x50 pixels and 3 channels, having an input shape of (30,50,50,3).

Since the input shape is the only one you need to define, Keras will demand it in the first layer.

But in this definition, Keras ignores the first dimension, which is the batch size. Your model should be able to deal with any batch size, so you define only the other dimensions:

input_shape = (50,50,3)
    #regardless of how many images I have, each image has this shape

Optionally, or when it's required by certain kinds of models, you can pass the shape containing the batch size via batch_input_shape=(30,50,50,3) or batch_shape=(30,50,50,3). This limits your training possibilities to this unique batch size, so it should be used only when really required.

Either way you choose, tensors in the model will have the batch dimension.

So, even if you used input_shape=(50,50,3), when keras sends you messages, or when you print the model summary, it will show (None,50,50,3).

The first dimension is the batch size, it's None because it can vary depending on how many examples you give for training. (If you defined the batch size explicitly, then the number you defined will appear instead of None)

Also, in advanced works, when you actually operate directly on the tensors (inside Lambda layers or in the loss function, for instance), the batch size dimension will be there.

So, when defining the input shape, you ignore the batch size: input_shape=(50,50,3)
When doing operations directly on tensors, the shape will be again (30,50,50,3)
When keras sends you a message, the shape will be (None,50,50,3) or (30,50,50,3), depending on what type of message it sends you.

Dim

And in the end, what is dim?

If your input shape has only one dimension, you don't need to give it as a tuple, you give input_dim as a scalar number.

So, in your model, where your input layer has 3 elements, you can use any of these two:

input_shape=(3,) -- The comma is necessary when you have only one dimension
input_dim = 3

But when dealing directly with the tensors, often dim will refer to how many dimensions a tensor has. For instance a tensor with shape (25,10909) has 2 dimensions.

Defining your image in Keras

Keras has two ways of doing it, Sequential models, or the functional API Model. I don't like using the sequential model, later you will have to forget it anyway because you will want models with branches.

PS: here I ignored other aspects, such as activation functions.

With the Sequential model:

from keras.models import Sequential  
from keras.layers import *  

model = Sequential()    

#start from the first hidden layer, since the input is not actually a layer   
#but inform the shape of the input, with 3 elements.    
model.add(Dense(units=4,input_shape=(3,))) #hidden layer 1 with input

#further layers:    
model.add(Dense(units=4)) #hidden layer 2
model.add(Dense(units=1)) #output layer

With the functional API Model:

from keras.models import Model   
from keras.layers import * 

#Start defining the input tensor:
inpTensor = Input((3,))   

#create the layers and pass them the input tensor to get the output tensor:    
hidden1Out = Dense(units=4)(inpTensor)    
hidden2Out = Dense(units=4)(hidden1Out)    
finalOut = Dense(units=1)(hidden2Out)   

#define the model's start and end points    
model = Model(inpTensor,finalOut)

Shapes of the tensors

Remember you ignore batch sizes when defining layers:

inpTensor: (None,3)
hidden1Out: (None,4)
hidden2Out: (None,4)
finalOut: (None,1)

Hide header in stack navigator React navigation

For me navigationOptions didn't work. The following worked for me.

<Stack.Screen name="Login" component={Login}
      options={{
               headerShown: false
              }}
     />

'ng' is not recognized as an internal or external command, operable program or batch file

make sure environment variables are set properly.

control panel-> system->advanced system settings-> select advanced Tab->
click on environment variables

and make sure in the path below line is available

`C:\Users\username\AppData\Roaming\npm`

here username will get changed based on the user

still if its not working yourenvironment variables are not getting reflected so please restart your machine it will work fine

if still you are facing issue your angular cli is not installed properly

please run below commands for reinstalling

   npm uninstall -g @angular/cli

    npm cache clean    or   npm cache clean  --force

    npm install -g @angular/cli@latest

AttributeError: module 'cv2.cv2' has no attribute 'createLBPHFaceRecognizer'

if you are using python3.x and opencv==4.1.0 then use following commands First of all

python -m pip install --user opencv-contrib-python

after that use this in the python script

cv2.face.LBPHFaceRecognizer_create()

How to fix Cannot find module 'typescript' in Angular 4?

This should do the trick,

npm install -g typescript

Flutter - Wrap text on overflow, like insert ellipsis or fade

Using Ellipsis

Text(
  "This is a long text",
  overflow: TextOverflow.ellipsis,
),

Using Fade

Text(
  "This is a long text",
  overflow: TextOverflow.fade,
  maxLines: 1,
  softWrap: false,
),

Using Clip

Text(
  "This is a long text",
  overflow: TextOverflow.clip,
  maxLines: 1,
  softWrap: false,
),

Note:

If you are using Text inside a Row, you can put above Text inside Expanded like:

Expanded(
  child: AboveText(),
)

How to hide the Google Invisible reCAPTCHA badge

My solution was to hide the badge, then display it when the user focuses on a form input - thus still adhering to Google's T&Cs.

Note: The reCAPTCHA I was tweaking had been generated by a WordPress plugin, so you may need to wrap the reCAPTCHA with a <div class="inv-recaptcha-holder"> ... </div> yourself.

CSS

.inv-recaptcha-holder {
  visibility: hidden;
  opacity: 0;
  transition: linear opacity 1s;
}

.inv-recaptcha-holder.show {
  visibility: visible;
  opacity: 1;
  transition: linear opacity 1s;
}

jQuery

$(document).ready(function () {
  $('form input, form textarea').on( 'focus', function() {
    $('.inv-recaptcha-holder').addClass( 'show' );
  });
});

Obviously you can change the jQuery selector to target specific forms if necessary.

'router-outlet' is not a known element

This issue was with me also. Simple trick for it.

 @NgModule({
  imports: [
   .....       
  ],
 declarations: [
  ......
 ],

 providers: [...],
 bootstrap: [...]
 })

use it as in above order.first imports then declarations.It worked for me.

Angular ForEach in Angular4/Typescript?

you can try typescript's For :

selectChildren(data , $event){
   let parentChecked : boolean = data.checked;
   for(let o of this.hierarchicalData){
      for(let child of o){
         child.checked = parentChecked;
      }
   }
}

Safe Area of Xcode 9

Safe Area is a layout guide (Safe Area Layout Guide).
The layout guide representing the portion of your view that is unobscured by bars and other content. In iOS 11+, Apple is deprecating the top and bottom layout guides and replacing them with a single safe area layout guide.

When the view is visible onscreen, this guide reflects the portion of the view that is not covered by other content. The safe area of a view reflects the area covered by navigation bars, tab bars, toolbars, and other ancestors that obscure a view controller's view. (In tvOS, the safe area incorporates the screen's bezel, as defined by the overscanCompensationInsets property of UIScreen.) It also covers any additional space defined by the view controller's additionalSafeAreaInsets property. If the view is not currently installed in a view hierarchy, or is not yet visible onscreen, the layout guide always matches the edges of the view.

For the view controller's root view, the safe area in this property represents the entire portion of the view controller's content that is obscured, and any additional insets that you specified. For other views in the view hierarchy, the safe area reflects only the portion of that view that is obscured. For example, if a view is entirely within the safe area of its view controller's root view, the edge insets in this property are 0.

According to Apple, Xcode 9 - Release note
Interface Builder uses UIView.safeAreaLayoutGuide as a replacement for the deprecated Top and Bottom layout guides in UIViewController. To use the new safe area, select Safe Area Layout Guides in the File inspector for the view controller, and then add constraints between your content and the new safe area anchors. This prevents your content from being obscured by top and bottom bars, and by the overscan region on tvOS. Constraints to the safe area are converted to Top and Bottom when deploying to earlier versions of iOS.

enter image description here

Here is simple reference as a comparison (to make similar visual effect) between existing (Top & Bottom) Layout Guide and Safe Area Layout Guide.

Safe Area Layout: enter image description here

AutoLayout

enter image description here

How to work with Safe Area Layout?

Follow these steps to find solution:

Enable 'Safe Area Layout', if not enabled.
Remove 'all constraint' if they shows connection with with Super view and re-attach all with safe layout anchor. OR Double click on a constraint and edit connection from super view to SafeArea anchor

Here is sample snapshot, how to enable safe area layout and edit constraint.

enter image description here

Here is result of above changes

enter image description here

Layout Design with SafeArea
When designing for iPhone X, you must ensure that layouts fill the screen and aren't obscured by the device's rounded corners, sensor housing, or the indicator for accessing the Home screen.

enter image description here

Most apps that use standard, system-provided UI elements like navigation bars, tables, and collections automatically adapt to the device's new form factor. Background materials extend to the edges of the display and UI elements are appropriately inset and positioned.

enter image description here

For apps with custom layouts, supporting iPhone X should also be relatively easy, especially if your app uses Auto Layout and adheres to safe area and margin layout guides.

enter image description here

Here is sample code (Ref from: Safe Area Layout Guide):
If you create your constraints in code use the safeAreaLayoutGuide property of UIView to get the relevant layout anchors. Let’s recreate the above Interface Builder example in code to see how it looks:

Assuming we have the green view as a property in our view controller:

private let greenView = UIView()

We might have a function to set up the views and constraints called from viewDidLoad:

private func setupView() {
  greenView.translatesAutoresizingMaskIntoConstraints = false
  greenView.backgroundColor = .green
  view.addSubview(greenView)
}

Create the leading and trailing margin constraints as always using the layoutMarginsGuide of the root view:

 let margins = view.layoutMarginsGuide
    NSLayoutConstraint.activate([
      greenView.leadingAnchor.constraint(equalTo: margins.leadingAnchor),
      greenView.trailingAnchor.constraint(equalTo: margins.trailingAnchor)
 ])

Now unless you are targeting iOS 11 only you will need to wrap the safe area layout guide constraints with #available and fall back to top and bottom layout guides for earlier iOS versions:

if #available(iOS 11, *) {
  let guide = view.safeAreaLayoutGuide
  NSLayoutConstraint.activate([
   greenView.topAnchor.constraintEqualToSystemSpacingBelow(guide.topAnchor, multiplier: 1.0),
   guide.bottomAnchor.constraintEqualToSystemSpacingBelow(greenView.bottomAnchor, multiplier: 1.0)
   ])

} else {
   let standardSpacing: CGFloat = 8.0
   NSLayoutConstraint.activate([
   greenView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: standardSpacing),
   bottomLayoutGuide.topAnchor.constraint(equalTo: greenView.bottomAnchor, constant: standardSpacing)
   ])
}

Result:

enter image description here

Following UIView extension, make it easy for you to work with SafeAreaLayout programatically.

extension UIView {

  // Top Anchor
  var safeAreaTopAnchor: NSLayoutYAxisAnchor {
    if #available(iOS 11.0, *) {
      return self.safeAreaLayoutGuide.topAnchor
    } else {
      return self.topAnchor
    }
  }

  // Bottom Anchor
  var safeAreaBottomAnchor: NSLayoutYAxisAnchor {
    if #available(iOS 11.0, *) {
      return self.safeAreaLayoutGuide.bottomAnchor
    } else {
      return self.bottomAnchor
    }
  }

  // Left Anchor
  var safeAreaLeftAnchor: NSLayoutXAxisAnchor {
    if #available(iOS 11.0, *) {
      return self.safeAreaLayoutGuide.leftAnchor
    } else {
      return self.leftAnchor
    }
  }

  // Right Anchor
  var safeAreaRightAnchor: NSLayoutXAxisAnchor {
    if #available(iOS 11.0, *) {
      return self.safeAreaLayoutGuide.rightAnchor
    } else {
      return self.rightAnchor
    }
  }

}

Here is sample code in Objective-C:

How to add a safe area programmatically

Here is Apple Developer Official Documentation for Safe Area Layout Guide

Safe Area is required to handle user interface design for iPhone-X. Here is basic guideline for How to design user interface for iPhone-X using Safe Area Layout

Failed to load AppCompat ActionBar with unknown error in android studio

I also had this problem and it's solved as change line from res/values/styles.xml

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

both solutions worked

Cannot find control with name: formControlName in angular reactive form

In your HTML code

<form [formGroup]="userForm">
    <input type="text" class="form-control"  [value]="item.UserFirstName" formControlName="UserFirstName">
    <input type="text" class="form-control"  [value]="item.UserLastName" formControlName="UserLastName">
</form>

In your Typescript code

export class UserprofileComponent implements OnInit {
    userForm: FormGroup;
    constructor(){ 
       this.userForm = new FormGroup({
          UserFirstName: new FormControl(),
          UserLastName: new FormControl()
       });
    }
}

This works perfectly, it does not give any error.

How to specify legend position in matplotlib in graph coordinates

The loc parameter specifies in which corner of the bounding box the legend is placed. The default for loc is loc="best" which gives unpredictable results when the bbox_to_anchor argument is used.
Therefore, when specifying bbox_to_anchor, always specify loc as well.

The default for bbox_to_anchor is (0,0,1,1), which is a bounding box over the complete axes. If a different bounding box is specified, is is usually sufficient to use the first two values, which give (x0, y0) of the bounding box.

Below is an example where the bounding box is set to position (0.6,0.5) (green dot) and different loc parameters are tested. Because the legend extents outside the bounding box, the loc parameter may be interpreted as "which corner of the legend shall be placed at position given by the 2-tuple bbox_to_anchor argument".

import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = 6, 3
fig, axes = plt.subplots(ncols=3)
locs = ["upper left", "lower left", "center right"]
for l, ax in zip(locs, axes.flatten()):
    ax.set_title(l)
    ax.plot([1,2,3],[2,3,1], "b-", label="blue")
    ax.plot([1,2,3],[1,2,1], "r-", label="red")
    ax.legend(loc=l, bbox_to_anchor=(0.6,0.5))
    ax.scatter((0.6),(0.5), s=81, c="limegreen", transform=ax.transAxes)

plt.tight_layout()    
plt.show()

See especially this answer for a detailed explanation and the question What does a 4-element tuple argument for 'bbox_to_anchor' mean in matplotlib? .

If you want to specify the legend position in other coordinates than axes coordinates, you can do so by using the bbox_transform argument. If may make sense to use figure coordinates

ax.legend(bbox_to_anchor=(1,0), loc="lower right",  bbox_transform=fig.transFigure)

It may not make too much sense to use data coordinates, but since you asked for it this would be done via bbox_transform=ax.transData.

Read file from resources folder in Spring Boot

create json folder in resources as subfolder then add json file in folder then you can use this code :

import com.fasterxml.jackson.core.type.TypeReference;

InputStream is = TypeReference.class.getResourceAsStream("/json/fcmgoogletoken.json");

this works in Docker.

Property 'value' does not exist on type EventTarget in TypeScript

you can also create your own interface as well.

    export interface UserEvent {
      target: HTMLInputElement;
    }

       ...

    onUpdatingServerName(event: UserEvent) {
      .....
    }

React navigation goBack() and update parent state

I would also use navigation.navigate. If someone has the same problem and also uses nested navigators, this is how it would work:

onPress={() =>
        navigation.navigate('MyStackScreen', {
          // Passing params to NESTED navigator screen:
          screen: 'goToScreenA',
          params: { Data: data.item },
        })
      }

Home does not contain an export named Home

Use

import Home from './layouts/Home'

rather than

import { Home } from './layouts/Home'

Remove {} from Home

Android Studio - Failed to notify project evaluation listener error

In my case I solved this error only by Invalidating caches.

File > Invalidate caches / Restart

Jersey stopped working with InjectionManagerFactory not found

As far as I can see dependencies have changed between 2.26-b03 and 2.26-b04 (HK2 was moved to from compile to testCompile)... there might be some change in the jersey dependencies that has not been completed yet (or which lead to a bug).

However, right now the simple solution is to stick to an older version :-)

Load json from local file with http.get() in angular 2

MY OWN SOLUTION

I created a new component called test in this folder:

I also created a mock called test.json in the assests folder created by angular cli (important):

This mock looks like this:

[
        {
            "id": 1,
            "name": "Item 1"
        },
        {
            "id": 2,
            "name": "Item 2"
        },
        {
            "id": 3,
            "name": "Item 3"
        }
]

In the controller of my component test import follow rxjs like this

import 'rxjs/add/operator/map'

This is important, because you have to map your response from the http get call, so you get a json and can loop it in your ngFor. Here is my code how I load the mock data. I used http get and called my path to the mock with this path this.http.get("/assets/mock/test/test.json"). After this i map the response and subscribe it. Then I assign it to my variable items and loop it with ngFor in my template. I also export the type. Here is my whole controller code:

import { Component, OnInit } from "@angular/core";
import { Http, Response } from "@angular/http";
import 'rxjs/add/operator/map'

export type Item = { id: number, name: string };

@Component({
  selector: "test",
  templateUrl: "./test.component.html",
  styleUrls: ["./test.component.scss"]
})
export class TestComponent implements OnInit {
  items: Array<Item>;

  constructor(private http: Http) {}

  ngOnInit() {
    this.http
      .get("/assets/mock/test/test.json")
      .map(data => data.json() as Array<Item>)
      .subscribe(data => {
        this.items = data;
        console.log(data);
      });
  }
}

And my loop in it's template:

<div *ngFor="let item of items">
  {{item.name}}
</div>

It works as expected! I can now add more mock files in the assests folder and just change the path to get it as json. Notice that you have also to import the HTTP and Response in your controller. The same in you app.module.ts (main) like this:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpModule, JsonpModule } from '@angular/http';


import { AppComponent } from './app.component';
import { TestComponent } from './components/molecules/test/test.component';


@NgModule({
  declarations: [
    AppComponent,
    TestComponent
  ],
  imports: [
    BrowserModule,
    HttpModule,
    JsonpModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Disable Button in Angular 2

Change ng-disabled="!contractTypeValid" to [disabled]="!contractTypeValid"

How to use jQuery Plugin with Angular 4?

ngOnInit() {
     const $ = window["$"];
     $('.flexslider').flexslider({
        animation: 'slide',
        start: function (slider) {
          $('body').removeClass('loading')
        }
     })
}

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

I added yellow highlighted package and now my view page is accessible. in eclipse when we deploy our war it only deploy those stuff mention in the deployment assessment.

We set Deployment Assessment from right click on project --> Properties --> Apply and Close....

Get keys of a Typescript interface as array of strings

// declarations.d.ts
export interface IMyTable {
      id: number;
      title: string;
      createdAt: Date;
      isDeleted: boolean
}
declare var Tes: IMyTable;
// call in annother page
console.log(Tes.id);

Cast object to interface in TypeScript

There's no casting in javascript, so you cannot throw if "casting fails".
Typescript supports casting but that's only for compilation time, and you can do it like this:

const toDo = <IToDoDto> req.body;
// or
const toDo = req.body as IToDoDto;

You can check at runtime if the value is valid and if not throw an error, i.e.:

function isToDoDto(obj: any): obj is IToDoDto {
    return typeof obj.description === "string" && typeof obj.status === "boolean";
}

@Post()
addToDo(@Response() res, @Request() req) {
    if (!isToDoDto(req.body)) {
        throw new Error("invalid request");
    }

    const toDo = req.body as IToDoDto;
    this.toDoService.addToDo(toDo);
    return res.status(HttpStatus.CREATED).end();
}

Edit

As @huyz pointed out, there's no need for the type assertion because isToDoDto is a type guard, so this should be enough:

if (!isToDoDto(req.body)) {
    throw new Error("invalid request");
}

this.toDoService.addToDo(req.body);

Returning a promise in an async function in TypeScript

When you do new Promise((resolve)... the type inferred was Promise<{}> because you should have used new Promise<number>((resolve).

It is interesting that this issue was only highlighted when the async keyword was added. I would recommend reporting this issue to the TS team on GitHub.

There are many ways you can get around this issue. All the following functions have the same behavior:

const whatever1 = () => {
    return new Promise<number>((resolve) => {
        resolve(4);
    });
};

const whatever2 = async () => {
    return new Promise<number>((resolve) => {
        resolve(4);
    });
};

const whatever3 = async () => {
    return await new Promise<number>((resolve) => {
        resolve(4);
    });
};

const whatever4 = async () => {
    return Promise.resolve(4);
};

const whatever5 = async () => {
    return await Promise.resolve(4);
};

const whatever6 = async () => Promise.resolve(4);

const whatever7 = async () => await Promise.resolve(4);

In your IDE you will be able to see that the inferred type for all these functions is () => Promise<number>.

How to print a Groovy variable in Jenkins?

The following code worked for me:

echo userInput

How to import image (.svg, .png ) in a React Component

Solved the problem, when moved the folder with the image in src folder. Then I turned to the image (project created through "create-react-app")
let image = document.createElement("img"); image.src = require('../assets/police.png');

How do I set the background color of my main screen in Flutter?

On the basic example of Flutter you can set with backgroundColor: Colors.X of Scaffold

  @override
 Widget build(BuildContext context) {
   // This method is rerun every time setState is called, for instance as done
  // by the _incrementCounter method above.
   //
  // The Flutter framework has been optimized to make rerunning build methods
   // fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
  backgroundColor: Colors.blue,
  body: Center(
    // Center is a layout widget. It takes a single child and positions it
    // in the middle of the parent.
    child: Column(
      // Column is also layout widget. It takes a list of children and
      // arranges them vertically. By default, it sizes itself to fit its
      // children horizontally, and tries to be as tall as its parent.
      //
      // Invoke "debug painting" (press "p" in the console, choose the
      // "Toggle Debug Paint" action from the Flutter Inspector in Android
      // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
      // to see the wireframe for each widget.
      //
      // Column has various properties to control how it sizes itself and
      // how it positions its children. Here we use mainAxisAlignment to
      // center the children vertically; the main axis here is the vertical
      // axis because Columns are vertical (the cross axis would be
      // horizontal).
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text(
          'You have pushed the button this many times:',
        ),
        Text(
          '$_counter',
          style: Theme.of(context).textTheme.display1,
        ),
      ],
    ),
  ),
  floatingActionButton: FloatingActionButton(
    onPressed: _incrementCounter,
    tooltip: 'Increment',
    child: Icon(Icons.add_circle),
  ), // This trailing comma makes auto-formatting nicer for build methods.
);
}

Check if value exists in enum in TypeScript

Type assertion is un-avoidable. Following up on

enum Vehicle {
    Car = 'car',
    Bike = 'bike',
    Truck = 'truck'
}

I found one alternative that wasn't mentioned so thought I'd share my fix for it:

const someString: Vehicle | string = 'car';
const inEnum = (Object.values(Vehicle) as string[]).includes(someString);

I find this more truthful because we usually come in typesafe(with a string) and want to compare it to the enum; it'd be a bit reckless to typecast it to any(reason: never do this) or Vehicle(reason: likely untruthful). Instead, typecasting the Object.values() output to an array of strings is in-fact very much real.

How to extract svg as file from web page

Based on a web search, I just found a Chrome plugin called SVG Export.

Available in the Chrome web store: https://chrome.google.com/webstore/detail/svg-export/naeaaedieihlkmdajjefioajbbdbdjgp
The home page is https://svgexport.io

How to set combobox default value?

You can do something like this:

    public myform()
    {
         InitializeComponent(); // this will be called in ComboBox ComboBox = new System.Windows.Forms.ComboBox();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'myDataSet.someTable' table. You can move, or remove it, as needed.
        this.myTableAdapter.Fill(this.myDataSet.someTable);
        comboBox1.SelectedItem = null;
        comboBox1.SelectedText = "--select--";           
    }

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

ECMAScript 6 introduced the let statement. You can use it in a for statement.

var ids:string = [];

for(let result of this.results){
   ids.push(result.Id);
}

How to check undefined in Typescript

It's because it's already null or undefined. Null or undefined does not have any type. You can check if it's is undefined first. In typescript (null == undefined) is true.

  if (uemail == undefined) {
      alert('undefined');
  } else {
      alert('defined');
  }

  if (uemail == null) {
      alert('undefined');
  } else {
      alert('defined');
  }

How to fix the error "Windows SDK version 8.1" was not found?

I had win10 SDK and I only had to do retarget and then I stopped getting this error. The idea was that the project needs to upgrade its target Windows SDK.

Error: Cannot match any routes. URL Segment: - Angular 2

please modify your router.module.ts as:

const routes: Routes = [
{
    path: '',
    redirectTo: 'one',
    pathMatch: 'full'
},
{
    path: 'two',
    component: ClassTwo, children: [
        {
            path: 'three',
            component: ClassThree,
            outlet: 'nameThree',
        },
        {
            path: 'four',
            component: ClassFour,
            outlet: 'nameFour'
        },
        {
           path: '',
           redirectTo: 'two',
           pathMatch: 'full'
        }
    ]
},];

and in your component1.html

<h3>In One</h3>

<nav>
    <a routerLink="/two" class="dash-item">...Go to Two...</a>
    <a routerLink="/two/three" class="dash-item">... Go to THREE...</a>
    <a routerLink="/two/four" class="dash-item">...Go to FOUR...</a>
</nav>

<router-outlet></router-outlet>                   // Successfully loaded component2.html
<router-outlet name="nameThree" ></router-outlet> // Error: Cannot match any routes. URL Segment: 'three'
<router-outlet name="nameFour" ></router-outlet>  // Error: Cannot match any routes. URL Segment: 'three'

General error: 1364 Field 'user_id' doesn't have a default value

Use database column nullble() in Laravel. You can choose the default value or nullable value in database.

Module AppRegistry is not registered callable module (calling runApplication)

Ok guys, here we are my solution for this issue:

npm install native-base@latest -g
npm install react-native@latest -g
change package.json for these dependencies
delete node_modules and npm install
Open it Xcode and Build/Run from scratch

I hope it helped

Visual Studio Code pylint: Unable to import 'protorpc'

I had same problem for pyodbc , I had two version of python on my Ubuntu (python3.8 and python3.9), problem was: package installed on python3.8 location but my interpreter was for python3.9. i installed python3.8 interpreter in command palette and it fixed.

Sort an array of objects in React and render them

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

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

How to uninstall an older PHP version from centOS7

Subscribing to the IUS Community Project Repository

cd ~
curl 'https://setup.ius.io/' -o setup-ius.sh

Run the script:

sudo bash setup-ius.sh

Upgrading mod_php with Apache

This section describes the upgrade process for a system using Apache as the web server and mod_php to execute PHP code. If, instead, you are running Nginx and PHP-FPM, skip ahead to the next section.

Begin by removing existing PHP packages. Press y and hit Enter to continue when prompted.

sudo yum remove php-cli mod_php php-common

Install the new PHP 7 packages from IUS. Again, press y and Enter when prompted.

sudo yum install mod_php70u php70u-cli php70u-mysqlnd

Finally, restart Apache to load the new version of mod_php:

sudo apachectl restart

You can check on the status of Apache, which is managed by the httpd systemd unit, using systemctl:

systemctl status httpd

Error: the entity type requires a primary key

Removed and added back in the table using Scaffold-DbContext and the error went away

Simple check for SELECT query empty result

SELECT COUNT(1) FROM service s WHERE s.service_id = ?

Override default Spring-Boot application.properties settings in Junit Test

TLDR:

So what I did was to have the standard src/main/resources/application.properties and also a src/test/resources/application-default.properties where i override some settings for ALL my tests.

Whole Story

I ran into the same problem and was not using profiles either so far. It seemed to be bothersome to have to do it now and remember declaring the profile -- which can be easily forgotten.

The trick is, to leverage that a profile specific application-<profile>.properties overrides settings in the general profile. See https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html#boot-features-external-config-profile-specific-properties.

How to add a single item to a Pandas Series

As far as @joaqin's solution is deprecated, because set_value method will be removed in a future pandas release, I would mention the other option to add a single item to pandas series, using .at[] accessor.

>>> import pandas as pd
>>> x = pd.Series()
>>> N = 4
>>> for i in range(N):
...     x.at[i] = i**2

It produces the same output.

>>> print(x)
0    0
1    1
2    4
3    9

jQuery form input select by id

If you have more than one element with the same ID, then you have invalid HTML.

But you can acheive the same result using classes instead. That's what they're designed for.

<input class='b' ... >

You can give it an ID as well if you need to, but it should be unique.

Once you've got the class in there, you can reference it with a dot instead of the hash, like so:

var value = $('#a .b').val();

var value = $('#a input.b').val();

which will limit it to 'b' class elements that are inputs within the form (which seems to be close to what you're asking for).

How can I find the method that called the current method?

In general, you can use the System.Diagnostics.StackTrace class to get a System.Diagnostics.StackFrame, and then use the GetMethod() method to get a System.Reflection.MethodBase object. However, there are some caveats to this approach:

It represents the runtime stack -- optimizations could inline a method, and you will not see that method in the stack trace.
It will not show any native frames, so if there's even a chance your method is being called by a native method, this will not work, and there is in-fact no currently available way to do it.

(NOTE: I am just expanding on the answer provided by Firas Assad.)

Cannot find Microsoft.Office.Interop Visual Studio

I had the same issue with Visual Studio Community 2013, I fixed it downloading and installing the latest update of Office Developer Tools for Visual Studio 2013. Now I am able to see the whole Microsoft.Office.Interop.* list when I go to

Add References > Assemblies > Extensions

you can download it from here:

https://www.visualstudio.com/en-us/news/vs2013-update4-rtm-vs.aspx#Office
http://aka.ms/OfficeDevToolsForVS2013

Explanation on Integer.MAX_VALUE and Integer.MIN_VALUE to find min and max value in an array

Instead of initializing the variables with arbitrary values (for example int smallest = 9999, largest = 0) it is safer to initialize the variables with the largest and smallest values representable by that number type (that is int smallest = Integer.MAX_VALUE, largest = Integer.MIN_VALUE).

Since your integer array cannot contain a value larger than Integer.MAX_VALUE and smaller than Integer.MIN_VALUE your code works across all edge cases.

How to do a HTTP HEAD request from the windows command line?

I'd download PuTTY and run a telnet session on port 80 to the webserver you want

HEAD /resource HTTP/1.1
Host: www.example.com

You could alternatively download Perl and try LWP's HEAD command. Or write your own script.

Why does the preflight OPTIONS request of an authenticated CORS request work in Chrome but not Firefox?

This is an old post but maybe this could help people to complete the CORS problem. To complete the basic authorization problem you should avoid authorization for OPTIONS requests in your server. This is an Apache configuration example. Just add something like this in your VirtualHost or Location.

<LimitExcept OPTIONS>
    AuthType Basic
    AuthName <AUTH_NAME>
    Require valid-user
    AuthUserFile <FILE_PATH>
</LimitExcept>

When does SQLiteOpenHelper onCreate() / onUpgrade() run?

May be I am too late but I would like to share my short and sweet answer. Please check Answer for a same problem. It will definitely help you. No more deep specifications.

If you are confident about syntax for creating table, than it may happen when you add new column in your same table, for that...

1) Uninstall from your device and run it again.

2) Setting -> app -> ClearData

3) Change DATABASE_VERSION in your "DatabaseHandler" class (If you have added new column than it will upgrade automatically)

public DatabaseHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

4) Change DATABASE_NAME in your "DatabaseHandler" class (I faced same problem. But I succeed by changing DATABASE_NAME.)

Adding a directory to the PATH environment variable in Windows

This only modifies the registry. An existing process won't use these values. A new process will do so if it is started after this change and doesn't inherit the old environment from its parent.

You didn't specify how you started the console session. The best way to ensure this is to exit the command shell and run it again. It should then inherit the updated PATH environment variable.

jQuery.getJSON - Access-Control-Allow-Origin Issue

It's simple, use $.getJSON() function and in your URL just include

callback=?

as a parameter. That will convert the call to JSONP which is necessary to make cross-domain calls. More info: http://api.jquery.com/jQuery.getJSON/

DBCC SHRINKFILE on log file not reducing size even after BACKUP LOG TO DISK

In addition to the steps you have already taken, you will need to set the recovery mode to simple before you can shrink the log.

THIS IS NOT A RECOMMENDED PRACTICE for production systems... You will lose your ability to recover to a point in time from previous backups/log files.

See example B on this DBCC SHRINKFILE (Transact-SQL) msdn page for an example, and explanation.

Comparison between Corona, Phonegap, Titanium

Rhomobile Rhodes (http://rhomobile.com/products/rhodes) is very similar in approach to PhoneGap, but is the only framework with:

a Model View Controller pattern (as most web frameworks provide)
an Object Relational Manager
support for all popular smartphones (including Windows Phone 7)
a hosted development service (not just hosted build): http://rhohub.com
a full debugger and SDK-less emulator in the RhoStudio IDE
support for synchronized offline data

ASP.NET MVC Html.ValidationSummary(true) does not display model errors

ADD it in the lowermost part og your View:

@section Scripts { @Scripts.Render("~/bundles/jqueryval") }

Concatenate columns in Apache Spark DataFrame

With raw SQL you can use CONCAT:

In Python

df = sqlContext.createDataFrame([("foo", 1), ("bar", 2)], ("k", "v"))
df.registerTempTable("df")
sqlContext.sql("SELECT CONCAT(k, ' ',  v) FROM df")

In Scala

import sqlContext.implicits._

val df = sc.parallelize(Seq(("foo", 1), ("bar", 2))).toDF("k", "v")
df.registerTempTable("df")
sqlContext.sql("SELECT CONCAT(k, ' ',  v) FROM df")

Since Spark 1.5.0 you can use concat function with DataFrame API:

In Python :

from pyspark.sql.functions import concat, col, lit

df.select(concat(col("k"), lit(" "), col("v")))

In Scala :

import org.apache.spark.sql.functions.{concat, lit}

df.select(concat($"k", lit(" "), $"v"))

There is also concat_ws function which takes a string separator as the first argument.

JSON.parse unexpected character error

You can make sure that the object in question is stringified before passing it to parse function by simply using JSON.stringify() .

Updated your line below,

JSON.parse(JSON.stringify({"balance":0,"count":0,"time":1323973673061,"firstname":"howard","userId":5383,"localid":1,"freeExpiration":0,"status":false}));

or if you have JSON stored in some variable:

JSON.parse(JSON.stringify(yourJSONobject));

What is the meaning of "int(a[::-1])" in Python?

The notation that is used in

a[::-1]

means that for a given string/list/tuple, you can slice the said object using the format

<object_name>[<start_index>, <stop_index>, <step>]

This means that the object is going to slice every "step" index from the given start index, till the stop index (excluding the stop index) and return it to you.

In case the start index or stop index is missing, it takes up the default value as the start index and stop index of the given string/list/tuple. If the step is left blank, then it takes the default value of 1 i.e it goes through each index.

So,

a = '1234'
print a[::2]

would print

Now the indexing here and also the step count, support negative numbers. So, if you give a -1 index, it translates to len(a)-1 index. And if you give -x as the step count, then it would step every x'th value from the start index, till the stop index in the reverse direction. For example

a = '1234'
print a[3:0:-1]

This would return

Note, that it doesn't return 4321 because, the stop index is not included.

Now in your case,

str(int(a[::-1]))

would just reverse a given integer, that is stored in a string, and then convert it back to a string

i.e "1234" -> "4321" -> 4321 -> "4321"

If what you are trying to do is just reverse the given string, then simply a[::-1] would work .

How to Sort a List<T> by a property in the object

Please let me complete the answer by @LukeH with some sample code, as I have tested it I believe it may be useful for some:

public class Order
{
    public string OrderId { get; set; }
    public DateTime OrderDate { get; set; }
    public int Quantity { get; set; }
    public int Total { get; set; }

    public Order(string orderId, DateTime orderDate, int quantity, int total)
    {
        OrderId = orderId;
        OrderDate = orderDate;
        Quantity = quantity;
        Total = total;
    }
}

public void SampleDataAndTest()
{
    List<Order> objListOrder = new List<Order>();

    objListOrder.Add(new Order("tu me paulo ", Convert.ToDateTime("01/06/2016"), 1, 44));
    objListOrder.Add(new Order("ante laudabas", Convert.ToDateTime("02/05/2016"), 2, 55));
    objListOrder.Add(new Order("ad ordinem ", Convert.ToDateTime("03/04/2016"), 5, 66));
    objListOrder.Add(new Order("collocationem ", Convert.ToDateTime("04/03/2016"), 9, 77));
    objListOrder.Add(new Order("que rerum ac ", Convert.ToDateTime("05/02/2016"), 10, 65));
    objListOrder.Add(new Order("locorum ; cuius", Convert.ToDateTime("06/01/2016"), 1, 343));


    Console.WriteLine("Sort the list by date ascending:");
    objListOrder.Sort((x, y) => x.OrderDate.CompareTo(y.OrderDate));

    foreach (Order o in objListOrder)
        Console.WriteLine("OrderId = " + o.OrderId + " OrderDate = " + o.OrderDate.ToString() + " Quantity = " + o.Quantity + " Total = " + o.Total);

    Console.WriteLine("Sort the list by date descending:");
    objListOrder.Sort((x, y) => y.OrderDate.CompareTo(x.OrderDate));
    foreach (Order o in objListOrder)
        Console.WriteLine("OrderId = " + o.OrderId + " OrderDate = " + o.OrderDate.ToString() + " Quantity = " + o.Quantity + " Total = " + o.Total);

    Console.WriteLine("Sort the list by OrderId ascending:");
    objListOrder.Sort((x, y) => x.OrderId.CompareTo(y.OrderId));
    foreach (Order o in objListOrder)
        Console.WriteLine("OrderId = " + o.OrderId + " OrderDate = " + o.OrderDate.ToString() + " Quantity = " + o.Quantity + " Total = " + o.Total);

    //etc ...
}

Intermediate language used in scalac?

The nearest equivalents would be icode and bcode as used by scalac, view Miguel Garcia's site on the Scalac optimiser for more information, here: http://magarciaepfl.github.io/scala/

You might also consider Java bytecode itself to be your intermediate representation, given that bytecode is the ultimate output of scalac.

Or perhaps the true intermediate is something that the JIT produces before it finally outputs native instructions?

Ultimately though... There's no single place that you can point at an claim "there's the intermediate!". Scalac works in phases that successively change the abstract syntax tree, every single phase produces a new intermediate. The whole thing is like an onion, and it's very hard to try and pick out one layer as somehow being more significant than any other.

How to make Python speak

PYTTSX3!

WHAT:

Pyttsx3 is a python module which is a modern clone of pyttsx, modified to work perfectly well in the latest versions of Python 3!

Python Package Index for downloads: https://pypi.python.org
GitHub for source , bugs, and Q&A: https://github.com/nateshmbhat/pyttsx3
Read the Full documentation at: https://pyttsx3.readthedocs.org

WHY:

It is 100% MULTI-PLATFORM and WORKS OFFLINE and IS ACTIVE/STILL BEING DEVELOPED and WORKS WITH ANY PYTHON VERSION

HOW:

It can be easily installed with pip install pyttsx3 and usage is the same as pyttsx:

import pyttsx3;
engine = pyttsx3.init();
engine.say("I will speak this text");
engine.runAndWait();

This is the best multi platform option!

Convert column classes in data.table

For a single column:

dtnew <- dt[, Quarter:=as.character(Quarter)]
str(dtnew)

Classes ‘data.table’ and 'data.frame':  10 obs. of  3 variables:
 $ ID     : Factor w/ 2 levels "A","B": 1 1 1 1 1 2 2 2 2 2
 $ Quarter: chr  "1" "2" "3" "4" ...
 $ value  : num  -0.838 0.146 -1.059 -1.197 0.282 ...

Using lapply and as.character:

dtnew <- dt[, lapply(.SD, as.character), by=ID]
str(dtnew)

Classes ‘data.table’ and 'data.frame':  10 obs. of  3 variables:
 $ ID     : Factor w/ 2 levels "A","B": 1 1 1 1 1 2 2 2 2 2
 $ Quarter: chr  "1" "2" "3" "4" ...
 $ value  : chr  "1.487145280568" "-0.827845218358881" "0.028977182770002" "1.35392750102305" ...

Error Message: Type or namespace definition, or end-of-file expected

You have extra brackets in Hours property;

public  object Hours { get; set; }}

Change/Get check state of CheckBox

Needs to be:

if (document.forms[0].elements["checkAddress"].checked == true)

Assuming you have one form, otherwise use the form name.

As a side note, don't call the element and the function in the same name it can cause weird conflicts.

Change Primary Key

Sometimes when we do these steps:

 alter table my_table drop constraint my_pk; 
 alter table my_table add constraint my_pk primary key (city_id, buildtime, time);

The last statement fails with

ORA-00955 "name is already used by an existing object"

Oracle usually creates an unique index with the same name my_pk. In such a case you can drop the unique index or rename it based on whether the constraint is still relevant.

You can combine the dropping of primary key constraint and unique index into a single sql statement:

alter table my_table drop constraint my_pk drop index;

check this: ORA-00955 "name is already used by an existing object"

How to extract a floating number from a string

I think that you'll find interesting stuff in the following answer of mine that I did for a previous similar question:

https://stackoverflow.com/q/5929469/551449

In this answer, I proposed a pattern that allows a regex to catch any kind of number and since I have nothing else to add to it, I think it is fairly complete

How do I force files to open in the browser instead of downloading (PDF)?

Open downloads.php from rootfile.

Then go to line 186 and change it to the following:

        if(preg_match("/\.jpg|\.gif|\.png|\.jpeg/i", $name)){
            $mime = getimagesize($download_location);
            if(!empty($mime)) {
                header("Content-Type: {$mime['mime']}");
            }
        }
        elseif(preg_match("/\.pdf/i", $name)){
            header("Content-Type: application/force-download");
            header("Content-type: application/pdf");
            header("Content-Disposition: inline; filename=\"".$name."\";");
        }

        else{
            header("Content-Type: application/force-download");
            header("Content-type: application/octet-stream");
            header("Content-Disposition: attachment; filename=\"".$name."\";");
        }

How do you synchronise projects to GitHub with Android Studio?

Android Studio 3.0

I love how easy this is in Android Studio.

1. Enter your GitHub login info

In Android Studio go to File > Settings > Version Control > GitHub. Then enter your GitHub username and password. (You only have to do this step once. For future projects you can skip it.)

2. Share your project

With your Android Studio project open, go to VCS > Import into Version Control > Share Project on GitHub.

Then click Share and OK.

That's all!

Copy multiple files from one directory to another from Linux shell

You can use brace expansion in bash:

cp /home/ankur/folder/{file1,abc,xyz} /path/to/target

Run Command Line & Command From VBS

Set oShell = CreateObject ("WScript.Shell") 
oShell.run "cmd.exe /C copy ""S:Claims\Sound.wav"" ""C:\WINDOWS\Media\Sound.wav"" "

How to turn on line numbers in IDLE?

Version 3.8 or newer:

To show line numbers in the current window, go to Options and click Show Line Numbers.

To show them automatically, go to Options > Configure IDLE > General and check the Show line numbers in new windows box.

Version 3.7 or older:

Unfortunately there is not an option to display line numbers in IDLE although there is an enhancement request open for this.

However, there are a couple of ways to work around this:

Under the edit menu there is a go to line option (there is a default shortcut of Alt+G for this).
There is a display at the bottom right which tells you your current line number / position on the line:

enter image description here

Install GD library and freetype on Linux

For CentOS: When installing php-gd you need to specify the version. I fixed it by running: sudo yum install php55-gd

Python variables as keys to dict

This question has practically been answered, but I just wanted to say it was funny that you said

This isn't anything fancy, like putting all local variables into a dictionary.

Because it is actually "fancier"

what you want is:

apple = 1
banana = 'f'
carrot = 3
fruitdict = {}

# I want to set the key equal to variable name, and value equal to variable value
# is there a more Pythonic way to get {'apple': 1, 'banana': 'f', 'carrot': 3}?

names= 'apple banana carrot'.split() # I'm just being lazy for this post
items = globals()                    # or locals()

for name in names:
    fruitdict[name] = items[name]

Honestly, what you are doing is just copying items from one dictionary to another.

(Greg Hewgill practically gave the whole answer, I just made it complete)

...and like people suggested, you should probably be putting these in the dictionary in the first place, but I'll assume that for some reason you can't

How do I use an image as a submit button?

HTML:

<button type="submit" name="submit" class="button">
  <img src="images/free.png" />
</button>

CSS:

.button {  }

How to add parameters to HttpURLConnection using POST using NameValuePair

I use something like this:

SchemeRegistry sR = new SchemeRegistry();
sR.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));

HttpParams params = new BasicHttpParams();
SingleClientConnManager mgr = new SingleClientConnManager(params, sR);

HttpClient httpclient = new DefaultHttpClient(mgr, params);

HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

HttpResponse response = httpclient.execute(httppost);

how to get yesterday's date in C#

You will get yesterday date by this following code snippet.

DateTime dtYesterday = DateTime.Now.Date.AddDays(-1);

Maximum filename length in NTFS (Windows XP and Windows Vista)?

The length in NTFS is 255. The NameLength field in the NTFS $Filename attribute is a byte with no offset; this yields a range of 0-255.

The file name iself can be in different "namespaces". So far there are: POSIX, WIN32, DOS and (WIN32DOS - when a filename can be natively a DOS name). (Since the string has a length, it could contain \0 but that would yield to problems and is not in the namespaces above.)

Thus the name of a file or directory can be up to 255 characters. When specifying the full path under Windows, you need to prefix the path with \\?\ (or use \\?\UNC\server\share for UNC paths) to mark this path as an extended-length one (~32k characters). If your path is longer, you will have to set your working directory along the way (ugh - side effects due to the process-wide setting).

How do I integrate Ajax with Django applications?

When we use Django:

Server ===> Client(Browser)   
      Send a page

When you click button and send the form,
----------------------------
Server <=== Client(Browser)  
      Give data back. (data in form will be lost)
Server ===> Client(Browser)  
      Send a page after doing sth with these data
----------------------------

If you want to keep old data, you can do it without Ajax. (Page will be refreshed)

Server ===> Client(Browser)   
      Send a page
Server <=== Client(Browser)  
      Give data back. (data in form will be lost)
Server ===> Client(Browser)  
      1. Send a page after doing sth with data
      2. Insert data into form and make it like before. 
      After these thing, server will send a html page to client. It means that server do more work, however, the way to work is same.

Or you can do with Ajax (Page will be not refreshed)

--------------------------
<Initialization> 
Server ===> Client(Browser) [from URL1]    
      Give a page                      
--------------------------  
<Communication>
Server <=== Client(Browser)     
      Give data struct back but not to refresh the page.
Server ===> Client(Browser) [from URL2] 
      Give a data struct(such as JSON)
---------------------------------

If you use Ajax, you must do these:

Initial a HTML page using URL1 (we usually initial page by Django template). And then server send client a html page.
Use Ajax to communicate with server using URL2. And then server send client a data struct.

Django is different from Ajax. The reason for this is as follows:

The thing return to client is different. The case of Django is HTML page. The case of Ajax is data struct.
Django is good at creating something, but it only can create once, it cannot change anything. Django is like anime, consist of many picture. By contrast, Ajax is not good at creating sth but good at change sth in exist html page.

In my opinion, if you would like to use ajax everywhere. when you need to initial a page with data at first, you can use Django with Ajax. But in some case, you just need a static page without anything from server, you need not use Django template.

If you don't think Ajax is the best practice. you can use Django template to do everything, like anime.

(My English is not good)

Tool to compare directories (Windows 7)

The tool that richardtz suggests is excellent.

Another one that is amazing and comes with a 30 day free trial is Araxis Merge. This one does a 3 way merge and is much more feature complete than winmerge, but it is a commercial product.

You might also like to check out Scott Hanselman's developer tool list, which mentions a couple more in addition to winmerge

Best way to get child nodes

Just to add to the other answers, there are still noteworthy differences here, specifically when dealing with <svg> elements.

I have used both .childNodes and .children and have preferred working with the HTMLCollection delivered by the .children getter.

Today however, I ran into issues with IE/Edge failing when using .children on an <svg>. While .children is supported in IE on basic HTML elements, it isn't supported on document/document fragments, or SVG elements.

For me, I was able to simply grab the needed elements via .childNodes[n] because I don't have extraneous text nodes to worry about. You may be able to do the same, but as mentioned elsewhere above, don't forget that you may run into unexpected elements.

Hope this is helpful to someone scratching their head trying to figure out why .children works elsewhere in their js on modern IE and fails on document or SVG elements.

Read connection string from web.config

I guess you need to add a reference to the System.Configuration assembly if that have not already been added.

Also, you may need to insert the following line at the top of your code file:

using System.Configuration;

How do I set a ViewModel on a window in XAML using DataContext property?

You might want to try Catel. It allows you to define a DataWindow class (instead of Window), and that class automatically creates the view model for you. This way, you can use the declaration of the ViewModel as you did in your original post, and the view model will still be created and set as DataContext.

See this article for an example.

rand() between 0 and 1

It doesn't. It makes 0 <= r < 1, but your original is 0 <= r <= 1.

Note that this can lead to undefined behavior if RAND_MAX + 1 overflows.

fileReader.readAsBinaryString to upload files

Use fileReader.readAsDataURL( fileObject ), this will encode it to base64, which you can safely upload to your server.

How to get the unique ID of an object which overrides hashCode()?

Maybe this quick, dirty solution will work?

public class A {
    static int UNIQUE_ID = 0;
    int uid = ++UNIQUE_ID;

    public int hashCode() {
        return uid;
    }
}

This also gives the number of instance of a class being initialized.

How do I print the percent sign(%) in c

Your problem is that you have to change:

printf("%");

printf("%%");

Or you could use ASCII code and write:

printf("%c", 37);

How to handle "Uncaught (in promise) DOMException: play() failed because the user didn't interact with the document first." on Desktop with Chrome 66?

The best solution i found out is to mute the video

HTML

<video loop muted autoplay id="videomain">
  <source src="videoname.mp4" type="video/mp4">
</video>

How to find GCD, LCM on a set of numbers

If you can use Java 8 (and actually want to) you can use lambda expressions to solve this functionally:

private static int gcd(int x, int y) {
    return (y == 0) ? x : gcd(y, x % y);
}

public static int gcd(int... numbers) {
    return Arrays.stream(numbers).reduce(0, (x, y) -> gcd(x, y));
}

public static int lcm(int... numbers) {
    return Arrays.stream(numbers).reduce(1, (x, y) -> x * (y / gcd(x, y)));
}

I oriented myself on Jeffrey Hantin's answer, but

calculated the gcd functionally
used the varargs-Syntax for an easier API (I was not sure if the overload would work correctly, but it does on my machine)
transformed the gcd of the numbers-Array into functional syntax, which is more compact and IMO easier to read (at least if you are used to functional programming)

This approach is probably slightly slower due to additional function calls, but that probably won't matter at all for the most use cases.

How can I save multiple documents concurrently in Mongoose/Node.js?

Mongoose 4.4 added a method called insertMany

Shortcut for validating an array of documents and inserting them into MongoDB if they're all valid. This function is faster than .create() because it only sends one operation to the server, rather than one for each document.

Quoting vkarpov15 from issue #723:

The tradeoffs are that insertMany() doesn't trigger pre-save hooks, but it should have better performance because it only makes 1 round-trip to the database rather than 1 for each document.

The method's signature is identical to create:

Model.insertMany([ ... ], (err, docs) => {
  ...
})

Or, with promises:

Model.insertMany([ ... ]).then((docs) => {
  ...
}).catch((err) => {
  ...
})

Check if input is number or letter javascript

Try this:

if(parseInt("0"+x, 10) > 0){/* x is integer */}

How to slice a Pandas Data Frame by position?

I can see at least three options:

df[:10]

2. Using head

df.head(10)

For negative values of n, this function returns all rows except the last n rows, equivalent to df[:-n] [Source].

3. Using iloc

df.iloc[:10]

Open window in JavaScript with HTML inserted

You can use window.open to open a new window/tab(according to browser setting) in javascript.

By using document.write you can write HTML content to the opened window.

exclude @Component from @ComponentScan

In case you need to define two or more excludeFilters criteria, you have to use the array.

For instances in this section of code I want to exclude all the classes in the org.xxx.yyy package and another specific class, MyClassToExclude

 @ComponentScan(            
        excludeFilters = {
                @ComponentScan.Filter(type = FilterType.REGEX, pattern = "org.xxx.yyy.*"),
                @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = MyClassToExclude.class) })

Spring RestTemplate timeout

Here is a really simple way to set the timeout:

RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());

private ClientHttpRequestFactory getClientHttpRequestFactory() {
    int timeout = 5000;
    HttpComponentsClientHttpRequestFactory clientHttpRequestFactory =
      new HttpComponentsClientHttpRequestFactory();
    clientHttpRequestFactory.setConnectTimeout(timeout);
    return clientHttpRequestFactory;
}

What is the equivalent of "none" in django templates?

You could try this:

{% if not profile.user.first_name.value %}
  <p> -- </p>
{% else %}
  {{ profile.user.first_name }} {{ profile.user.last_name }}
{% endif %}

This way, you're essentially checking to see if the form field first_name has any value associated with it. See {{ field.value }} in Looping over the form's fields in Django Documentation.

I'm using Django 3.0.

Hibernate JPA Sequence (non-Id)

I've been in a situation like you (JPA/Hibernate sequence for non @Id field) and I ended up creating a trigger in my db schema that add a unique sequence number on insert. I just never got it to work with JPA/Hibernate

Remove last specific character in a string c#

When you have spaces at the end. you can use beliow.

ProcessStr = ProcessStr.Replace(" ", "");
Emails     = ProcessStr.TrimEnd(';');

Convert or extract TTC font to TTF - how to?

This is what worked for me for extracting TTFs from .dfont and .ttc files from Mac OS X: http://transfonter.org/ttc-unpack

The resulting TTFs work fine in Windows 7.

conflicting types error when compiling c program using gcc

To answer a more generic case, this error is noticed when you pick a function name which is already used in some built in library. For e.g., select.

A simple method to know about it is while compiling the file, the compiler will indicate the previous declaration.

How do I speed up the gwt compiler?

Split your application into multiple modules or entry points and re-compile then only when needed.
Analyse your application using the trunk version - which provides the Story of your compile. This may or may not be relevant to the 1.6 compiler but it can indicate what's going on.

Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null object reference]

if u have creat a new toolbar then apply check that u have apply the method setSupportActionBar(); it will defenetly help you

T-SQL How to select only Second row from a table?

I'm guessing you're using SQL 2005 or greater. The 2nd line selects the top 2 rows and by using ORDER BY ROW_COUNT DESC, the 2nd row is arranged as being first, then it is selected using TOP 1

SELECT TOP 1 COLUMN1, COLUMN2
from (
  SELECT TOP 2 COLUMN1, COLUMN2
  FROM Table
) ORDER BY ROW_NUMBER DESC

How to convert a string with comma-delimited items to a list in Python?

Like this:

>>> text = 'a,b,c'
>>> text = text.split(',')
>>> text
[ 'a', 'b', 'c' ]

Alternatively, you can use eval() if you trust the string to be safe:

>>> text = 'a,b,c'
>>> text = eval('[' + text + ']')

What is the difference between HTML tags and elements?

This visualization can help us to find out difference between concept of element and tag (each indent means contain):

- element

        - content:

            - text 

            - other elements 

            - or empty

        - and its markup

            - tags (start or end tag)

                - element name

                - angle brackets < >

                - or attributes (just for start tag)

                - or slash /

Why is 22 the default port number for SFTP?

Ahem, because 22 is the port number for ssh and has been for ages?

Modifying local variable from inside lambda

To have a more general solution, you can write a generic Wrapper class:

public static class Wrapper<T> {
    public T obj;
    public Wrapper(T obj) { this.obj = obj; }
}
...
Wrapper<Integer> w = new Wrapper<>(0);
this.forEach(s -> {
    s.setOrdinal(w.obj);
    w.obj++;
});

(this is a variant of the solution given by Almir Campos).

In the specific case this is not a good solution, as Integer is worse than int for your purpose, anyway this solution is more general I think.

How can I get the class name from a C++ object?

Do you want [classname] to be 'one' and [objectname] to be 'A'?

If so, this is not possible. These names are only abstractions for the programmer, and aren't actually used in the binary code that is generated. You could give the class a static variable classname, which you set to 'one' and a normal variable objectname which you would assign either directly, through a method or the constructor. You can then query these methods for the class and object names.

Is <img> element block level or inline level?

For almost all purposes think of them as an inline element with a width set. Basically you are free to dictate how you would like images to display using CSS. I generally set a few image classes like so:

img.center {display:block;margin:0 auto;}

img.left {float:left;margin-right:10px;}

img.right  {float:right;margin-left:10px;}

img.border  {border:1px solid #333;}

How to stop the task scheduled in java.util.Timer class

Either call cancel() on the Timer if that's all it's doing, or cancel() on the TimerTask if the timer itself has other tasks which you wish to continue.

Align HTML input fields by :

I have just given width to Label and input type were aligned automatically.

_x000D_

input[type="text"] {_x000D_
    width:100px;_x000D_
 height:30px;_x000D_
 border-radius:5px;_x000D_
 background-color: lightblue;_x000D_
 margin-left:2px;_x000D_
  position:relative;_x000D_
}_x000D_
_x000D_
label{_x000D_
position:relative;_x000D_
width:300px;_x000D_
border:2px dotted black;_x000D_
margin:20px;_x000D_
padding:5px;_x000D_
font-family:AR CENA;_x000D_
font-size:20px;_x000D_
_x000D_
}

_x000D_

<label>First Name:</label><input type="text" name="fname"><br>_x000D_
<label>Last Name:</label><input type="text" name="lname"><br>

_x000D_

Maven build failed: "Unable to locate the Javac Compiler in: jre or jdk issue"

You need to indicate JAVA_HOME in mvn.ini (it's in the Maven folder /bin), and your problem will disappear.

How can I convert this one line of ActionScript to C#?

There is collection of Func<...> classes - Func that is probably what you are looking for:

 void MyMethod(Func<int> param1 = null)

This defines method that have parameter param1 with default value null (similar to AS), and a function that returns int. Unlike AS in C# you need to specify type of the function's arguments.

So if you AS usage was

MyMethod(function(intArg, stringArg) { return true; })

Than in C# it would require param1 to be of type Func<int, siring, bool> and usage like

MyMethod( (intArg, stringArg) => { return true;} );

Difference between DOM parentNode and parentElement

In Internet Explorer, parentElement is undefined for SVG elements, whereas parentNode is defined.

remove inner shadow of text input

here is a small snippet that might be cool to try out:

input {
border-radius: 10px;
border-color: violet;
border-style: solid;
}

note that: border-style removes the inner shadow.

_x000D_

input {_x000D_
    border-radius: 10px;_x000D_
    border-color: violet;_x000D_
    border-style: solid;_x000D_
  }

_x000D_

<input type="text"/>

_x000D_

Is there an upper bound to BigInteger?

The number is held in an int[] - the maximum size of an array is Integer.MAX_VALUE. So the maximum BigInteger probably is (2 ^ 32) ^ Integer.MAX_VALUE.

Admittedly, this is implementation dependent, not part of the specification.

In Java 8, some information was added to the BigInteger javadoc, giving a minimum supported range and the actual limit of the current implementation:

BigInteger must support values in the range -2^{Integer.MAX_VALUE} (exclusive) to +2^{Integer.MAX_VALUE} (exclusive) and may support values outside of that range.

Implementation note: BigInteger constructors and operations throw ArithmeticException when the result is out of the supported range of -2^{Integer.MAX_VALUE} (exclusive) to +2^{Integer.MAX_VALUE} (exclusive).

What version of JBoss I am running?

/apps/jboss-eap-6.2/bin/standalone.sh -version

Sample output:

=========================================================================

  JBoss Bootstrap Environment

  JBOSS_HOME: /apps/jboss-eap-6.2

  JAVA: /apps/jdks/jdk_1.7/bin/java

  JAVA_OPTS:  -server -XX:+UseCompressedOops -Xms1303m -Xmx1303m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true

=========================================================================

21:07:20,380 INFO  [org.jboss.modules] (main) JBoss Modules version 1.3.3.Final-redhat-1
21:07:22,206 INFO  [stdout] (main) JBoss EAP 6.2.2.GA (AS 7.3.2.Final-redhat-2)

Convert an int to ASCII character

This is how I converted a number to an ASCII code. 0 though 9 in hex code is 0x30-0x39. 6 would be 0x36.

unsigned int temp = 6;
or you can use unsigned char temp = 6;
unsigned char num;
 num = 0x30| temp;

this will give you the ASCII value for 6. You do the same for 0 - 9

to convert ASCII to a numeric value I came up with this code.

unsigned char num,code;
code = 0x39; // ASCII Code for 9 in Hex
num = 0&0F & code;

org.springframework.web.client.HttpClientErrorException: 400 Bad Request

This is what worked for me. Issue is earlier I didn't set Content Type(header) when I used exchange method.

MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
map.add("param1", "123");
map.add("param2", "456");
map.add("param3", "789");
map.add("param4", "123");
map.add("param5", "456");

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

final HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<MultiValueMap<String, String>>(map ,
        headers);
JSONObject jsonObject = null;

try {
    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<String> responseEntity = restTemplate.exchange(
            "https://url", HttpMethod.POST, entity,
            String.class);

    if (responseEntity.getStatusCode() == HttpStatus.CREATED) {
        try {
            jsonObject = new JSONObject(responseEntity.getBody());
        } catch (JSONException e) {
            throw new RuntimeException("JSONException occurred");
        }
    }
  } catch (final HttpClientErrorException httpClientErrorException) {
        throw new ExternalCallBadRequestException();
  } catch (HttpServerErrorException httpServerErrorException) {
        throw new ExternalCallServerErrorException(httpServerErrorException);
  } catch (Exception exception) {
        throw new ExternalCallServerErrorException(exception);
    }

ExternalCallBadRequestException and ExternalCallServerErrorException are the custom exceptions here.

Note: Remember HttpClientErrorException is thrown when a 4xx error is received. So if the request you send is wrong either setting header or sending wrong data, you could receive this exception.

How do I convert from a string to an integer in Visual Basic?

Use Val(txtPrice.text)

I would also allow only number and the dot char by inserting some validation code in the key press event of the price text box.

Setting up FTP on Amazon Cloud Server

To enable passive ftp on an EC2 server, you need to configure the ports that your ftp server should use for inbound connections, then open a list of available ports for the ftp client data connections.

I'm not that familiar with linux, but the commands you posted are the steps to install the ftp server, configure the ec2 firewall rules (through the AWS API), then configure the ftp server to use the ports you allowed on the ec2 firewall.

So this step installs the ftp client (VSFTP)

> yum install vsftpd

These steps configure the ftp client

> vi /etc/vsftpd/vsftpd.conf
--    Add following lines at the end of file --
     pasv_enable=YES
     pasv_min_port=1024
     pasv_max_port=1048
     pasv_address=<Public IP of your instance> 
> /etc/init.d/vsftpd restart

but the other two steps are easier done through the amazon console under EC2 Security groups. There you need to configure the security group that is assigned to your server to allow connections on ports 20,21, and 1024-1048

Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect)

I had the same problem and in my case the problem was missing and/or incorrect equals implementation on some types of fields in the entity object. At commit time, Hibernate checks ALL entities loaded in the session to check if they are dirty. If any of the entities are dirty, hibernate tries to persist them - no matter of the fact that the actual object that is requested a save operation is not related to the other entities.

Entity dirtiness is done by comparing every property of given object (with their equals methods) or UserType.equals if property has an associated org.Hibernate.UserType.

Another thing that surprised me was, in my transaction (using Spring annotation @Transactional), I was dealing with a single entity. Hibernate was complaining about some random entity that's unrelated to that entity being saved. What I realized is there is an outermost transaction we create at REST controller level, so the scope of the session is too big and hence all objects ever loaded as part of request processing get checked for dirtiness.

Hope this helps someone, some day.

Thanks Rags

How to hide keyboard in swift on pressing return key?

All in One Hide Keyboard and Move View on Keyboard Open: Swift 5

override func viewDidLoad() {
    super.viewDidLoad()
    let tap = UITapGestureRecognizer(target: self, action: #selector(taped))
    view.addGestureRecognizer(tap)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}


   override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(true)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}
 @objc func taped(){

    self.view.endEditing(true)

}

@objc func KeyboardWillShow(sender: NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y == 0{
        self.view.frame.origin.y -= keyboardSize.height
    }


}

@objc func KeyboardWillHide(sender : NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y != 0{
        self.view.frame.origin.y += keyboardSize.height
    }

}

Activity transition in Android

Here's the code to do a nice smooth between two activity.

smooth effect from left to right

Create a file called slide_in_right.xml and slide_out_right.xml in res/anim

slide_in_right.xml

    <?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android"
        android:shareInterpolator="false" >
        <translate android:duration="5000" android:fromXDelta="100%" android:toXDelta="0%" />
        <alpha android:duration="5000" android:fromAlpha="0.0" android:toAlpha="1.0" />
    </set>

slide_out_right.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false" >
    <translate android:duration="5000" android:fromXDelta="0%" android:toXDelta="-100%"/>
    <alpha android:duration="5000" android:fromAlpha="1.0" android:toAlpha="0.0" />
</set>

smooth effect from right to left

Create a file called animation_enter.xml and animation_leave.xml in res/anim

animation_enter.xml

   <set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate android:fromXDelta="-100%" android:toXDelta="0%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="700"/>
   </set>

animation_leave.xml

  <set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate
        android:fromXDelta="0%" android:toXDelta="100%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="700" />
  </set>

Navigate from one activity to second Activity

   Intent intent_next=new Intent(One_Activity.this,Second_Activity.class);
   overridePendingTransition(R.anim.slide_in_right,R.anim.slide_out_right);
   startActivity(intent_next);
 finish();

4.On back press event or Navigate from second activity to one Activity

 Intent home_intent = new Intent(Second_Activity.this, One_Activity.class);
 overridePendingTransition(R.anim.animation_enter, R.anim.animation_leave);
 startActivity(home_intent);
 finish();

After installation of Gulp: “no command 'gulp' found”

Tried with sudo and it worked !!

sudo npm install --global gulp-cli

XPath to select multiple tags

One correct answer is:

/a/b/*[self::c or self::d or self::e]

Do note that this

a/b/*[local-name()='c' or local-name()='d' or local-name()='e']

is both too-long and incorrect. This XPath expression will select nodes like:

OhMy:c

NotWanted:d 

QuiteDifferent:e

Java: how to represent graphs?

Each node is named uniquely and knows who it is connected to. The List of connections allows for a Node to be connected to an arbitrary number of other nodes.

public class Node {
    public String name;
    public List<Edge> connections;
}

Each connection is directed, has a start and an end, and is weighted.

public class Edge {
    public Node start;
    public Node end;
    public double weight;
}

A graph is just your collection of nodes. Instead of List<Node> consider Map<String, Node> for fast lookup by name.

public class Graph {
    List<Node> nodes;
}

How to pass arguments within docker-compose?

This feature was added in Compose 1.6.

Reference: https://docs.docker.com/compose/compose-file/#args

services:
  web:
    build:
      context: .
      args:
        FOO: foo

Static link of shared library function in gcc

If you have the .a file of your shared library (.so) you can simply include it with its full path as if it was an object file, like this:

This generates main.o by just compiling:

gcc -c main.c

This links that object file with the corresponding static library and creates the executable (named "main"):

gcc main.o mylibrary.a -o main

Or in a single command:

gcc main.c mylibrary.a -o main

It could also be an absolute or relative path:

gcc main.c /usr/local/mylibs/mylibrary.a -o main

Running Command Line in Java

To avoid the called process to be blocked if it outputs a lot of data on the standard output and/or error, you have to use the solution provided by Craigo. Note also that ProcessBuilder is better than Runtime.getRuntime().exec(). This is for a couple of reasons: it tokenizes better the arguments, and it also takes care of the error standard output (check also here).

ProcessBuilder builder = new ProcessBuilder("cmd", "arg1", ...);
builder.redirectErrorStream(true);
final Process process = builder.start();

// Watch the process
watch(process);

I use a new function "watch" to gather this data in a new thread. This thread will finish in the calling process when the called process ends.

private static void watch(final Process process) {
    new Thread() {
        public void run() {
            BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line = null; 
            try {
                while ((line = input.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }.start();
}

What is a NoReverseMatch error, and how do I fix it?

And make sure your route in the list of routes:

./manage.py show_urls | grep path_or_name

https://github.com/django-extensions/django-extensions

AttributeError: 'module' object has no attribute 'urlopen'

Use six module to make you code compatible between python2 and python3

urllib.request.urlopen("<your-url>")```

why should I make a copy of a data frame in pandas

It's necessary to mention that returning copy or view depends on kind of indexing.

The pandas documentation says:

Returning a view versus a copy

The rules about when a view on the data is returned are entirely dependent on NumPy. Whenever an array of labels or a boolean vector are involved in the indexing operation, the result will be a copy. With single label / scalar indexing and slicing, e.g. df.ix[3:6] or df.ix[:, 'A'], a view will be returned.

Focus Input Box On Load

Add this to the top of your js

var input = $('#myinputbox');

input.focus();

Or to html

<script>
    var input = $('#myinputbox');

    input.focus();
</script>

Drawing Isometric game worlds

If you have some tiles that exceed the bounds of your diamond, I recommend drawing in depth order:

...1...
..234..
.56789.
..abc..
...d...

What do "branch", "tag" and "trunk" mean in Subversion repositories?

The trunk is the development line that holds the latest source code and features. It should have the latest bug fixes in it as well as the latest features added to the project.

The branches are usually used to do something away from the trunk (or other development line) that would otherwise break the build. New features are often built in a branch and then merged back into the trunk. Branches often contain code that are not necessarily approved for the development line it branched from. For example, a programmer could try an optimization on something in a branch and only merge back in the development line once the optimization is satisfactory.

The tags are snapshots of the repository at a particular time. No development should occur on these. They are most often used to take a copy of what was released to a client so that you can easily have access to what a client is using.

Here's a link to a very good guide to repositories:

Source Control HOWTO

The articles in Wikipedia are also worth reading.

Test if a variable is a list or tuple

Go ahead and use isinstance if you need it. It is somewhat evil, as it excludes custom sequences, iterators, and other things that you might actually need. However, sometimes you need to behave differently if someone, for instance, passes a string. My preference there would be to explicitly check for str or unicode like so:

import types
isinstance(var, types.StringTypes)

N.B. Don't mistake types.StringType for types.StringTypes. The latter incorporates str and unicode objects.

The types module is considered by many to be obsolete in favor of just checking directly against the object's type, so if you'd rather not use the above, you can alternatively check explicitly against str and unicode, like this:

isinstance(var, (str, unicode)):

Edit:

Better still is:

isinstance(var, basestring)

End edit

After either of these, you can fall back to behaving as if you're getting a normal sequence, letting non-sequences raise appropriate exceptions.

See the thing that's "evil" about type checking is not that you might want to behave differently for a certain type of object, it's that you artificially restrict your function from doing the right thing with unexpected object types that would otherwise do the right thing. If you have a final fallback that is not type-checked, you remove this restriction. It should be noted that too much type checking is a code smell that indicates that you might want to do some refactoring, but that doesn't necessarily mean you should avoid it from the getgo.

Linux c++ error: undefined reference to 'dlopen'

The topic is quite old, yet I struggled with the same issue today while compiling cegui 0.7.1 (openVibe prerequisite).

What worked for me was to set: LDFLAGS="-Wl,--no-as-needed" in the Makefile.

I've also tried -ldl for LDFLAGS but to no avail.

Conditional WHERE clause in SQL Server

Try this one -

WHERE DateDropped = 0
    AND (
        (ISNULL(@JobsOnHold, 0) = 1 AND DateAppr >= 0) 
        OR 
        (ISNULL(@JobsOnHold, 0) != 1 AND DateAppr != 0)
    )

How to skip over an element in .map()?

I use .forEach to iterate over , and push result to results array then use it, with this solution I will not loop over array twice

Can I force a UITableView to hide the separator between empty cells?

The following worked very well for me for this problem:

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {

CGRect frame = [self.view frame];
frame.size.height =  frame.size.height - (kTableRowHeight * numberOfRowsInTable);

UIView *footerView = [[UIView alloc] initWithFrame:frame];
return footerView; }

Where kTableRowHeight is the height of my row cells and numberOfRowsInTable is the number of rows I had in the table.

Hope that helps,

Brenton.

How do you find the sum of all the numbers in an array in Java?

I use this:

public static long sum(int[] i_arr)
{
    long sum;
    int i;
    for(sum= 0, i= i_arr.length - 1; 0 <= i; sum+= i_arr[i--]);
    return sum;
}

MYSQL into outfile "access denied" - but my user has "ALL" access.. and the folder is CHMOD 777

For future readers, one easy way is as follows if they wish to export in bulk using bash,

akshay@ideapad:/tmp$ mysql -u someuser -p test -e "select * from offices"
Enter password: 
+------------+---------------+------------------+--------------------------+--------------+------------+-----------+------------+-----------+
| officeCode | city          | phone            | addressLine1             | addressLine2 | state      | country   | postalCode | territory |
+------------+---------------+------------------+--------------------------+--------------+------------+-----------+------------+-----------+
| 1          | San Francisco | +1 650 219 4782  | 100 Market Street        | Suite 300    | CA         | USA       | 94080      | NA        |
| 2          | Boston        | +1 215 837 0825  | 1550 Court Place         | Suite 102    | MA         | USA       | 02107      | NA        |
| 3          | NYC           | +1 212 555 3000  | 523 East 53rd Street     | apt. 5A      | NY         | USA       | 10022      | NA        |
| 4          | Paris         | +33 14 723 4404  | 43 Rue Jouffroy D'abbans | NULL         | NULL       | France    | 75017      | EMEA      |
| 5          | Tokyo         | +81 33 224 5000  | 4-1 Kioicho              | NULL         | Chiyoda-Ku | Japan     | 102-8578   | Japan     |
| 6          | Sydney        | +61 2 9264 2451  | 5-11 Wentworth Avenue    | Floor #2     | NULL       | Australia | NSW 2010   | APAC      |
| 7          | London        | +44 20 7877 2041 | 25 Old Broad Street      | Level 7      | NULL       | UK        | EC2N 1HN   | EMEA      |
+------------+---------------+------------------+--------------------------+--------------+------------+-----------+------------+-----------+

If you're exporting by non-root user then set permission like below

root@ideapad:/tmp# mysql -u root -p
MariaDB[(none)]> UPDATE mysql.user SET File_priv = 'Y' WHERE user='someuser' AND host='localhost';

Restart or Reload mysqld

akshay@ideapad:/tmp$ sudo su
root@ideapad:/tmp#  systemctl restart mariadb

Sample code snippet

akshay@ideapad:/tmp$ cat test.sh 
#!/usr/bin/env bash

user="someuser"
password="password"
database="test"

mysql -u"$user" -p"$password" "$database" <<EOF
SELECT * 
INTO OUTFILE '/tmp/csvs/offices.csv' 
FIELDS TERMINATED BY '|' 
ENCLOSED BY '"' 
LINES TERMINATED BY '\n'
FROM offices;
EOF

Execute

akshay@ideapad:/tmp$ mkdir -p /tmp/csvs
akshay@ideapad:/tmp$ chmod +x test.sh
akshay@ideapad:/tmp$ ./test.sh 
akshay@ideapad:/tmp$ cat /tmp/csvs/offices.csv 
"1"|"San Francisco"|"+1 650 219 4782"|"100 Market Street"|"Suite 300"|"CA"|"USA"|"94080"|"NA"
"2"|"Boston"|"+1 215 837 0825"|"1550 Court Place"|"Suite 102"|"MA"|"USA"|"02107"|"NA"
"3"|"NYC"|"+1 212 555 3000"|"523 East 53rd Street"|"apt. 5A"|"NY"|"USA"|"10022"|"NA"
"4"|"Paris"|"+33 14 723 4404"|"43 Rue Jouffroy D'abbans"|\N|\N|"France"|"75017"|"EMEA"
"5"|"Tokyo"|"+81 33 224 5000"|"4-1 Kioicho"|\N|"Chiyoda-Ku"|"Japan"|"102-8578"|"Japan"
"6"|"Sydney"|"+61 2 9264 2451"|"5-11 Wentworth Avenue"|"Floor #2"|\N|"Australia"|"NSW 2010"|"APAC"
"7"|"London"|"+44 20 7877 2041"|"25 Old Broad Street"|"Level 7"|\N|"UK"|"EC2N 1HN"|"EMEA"

C# how to convert File.ReadLines into string array?

File.ReadLines() returns an object of type System.Collections.Generic.IEnumerable<String>
File.ReadAllLines() returns an array of strings.

If you want to use an array of strings you need to call the correct function.

You could use Jim solution, just use ReadAllLines() or you could change your return type.

This would also work:

System.Collections.Generic.IEnumerable<String> lines = File.ReadLines("c:\\file.txt");

You can use any generic collection which implements IEnumerable. IList for an example.

How to center horizontal table-cell

Short snippet for future visitors - how to center horizontal table-cell (+ vertically)

_x000D_

html, body {_x000D_
  width: 100%;_x000D_
  height: 100%;_x000D_
}_x000D_
_x000D_
.tab {_x000D_
  display: table;_x000D_
  width: 100%;_x000D_
  height: 100%;_x000D_
}_x000D_
_x000D_
.cell {_x000D_
  display: table-cell;_x000D_
  vertical-align: middle;_x000D_
  text-align: center; /* the key */_x000D_
  background-color: #EEEEEE;_x000D_
}_x000D_
_x000D_
.content {_x000D_
  display: inline-block; /* important !! */_x000D_
  width: 100px;_x000D_
  background-color: #00FF00;_x000D_
}

_x000D_

<div class="tab">_x000D_
  <div class="cell">_x000D_
    <div class="content" id="a">_x000D_
      <p>Content</p>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>

_x000D_

How do I fix MSB3073 error in my post-build event?

If the problem still persists even after putting the after build in the correct project try using "copy" instead of xcopy. This worked for me.

"VT-x is not available" when I start my Virtual machine

Are you sure your processor supports Intel Virtualization (VT-x) or AMD Virtualization (AMD-V)?

Here you can find Hardware-Assisted Virtualization Detection Tool ( http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0ee2a17f-8538-4619-8d1c-05d27e11adb2&displaylang=en) which will tell you if your hardware supports VT-x.

Alternatively you can find your processor here: http://ark.intel.com/Default.aspx. All AMD processors since 2006 supports Virtualization.

Converting integer to digit list

By looping it can be done the following way :)

num1= int(input('Enter the number'))
sum1 = num1 #making a alt int to store the value of the orginal so it wont be affected
y = [] #making a list 
while True:
    if(sum1==0):#checking if the number is not zero so it can break if it is
        break
    d = sum1%10 #last number of your integer is saved in d
    sum1 = int(sum1/10) #integer is now with out the last number ie.4320/10 become 432
    y.append(d) # appending the last number in the first place

y.reverse()#as last is in first , reversing the number to orginal form
print(y)

Answer becomes

Enter the number2342
[2, 3, 4, 2]

Callback when CSS3 transition finishes

The accepted answer currently fires twice for animations in Chrome. Presumably this is because it recognizes webkitAnimationEnd as well as animationEnd. The following will definitely only fires once:

/* From Modernizr */
function whichTransitionEvent(){

    var el = document.createElement('fakeelement');
    var transitions = {
        'animation':'animationend',
        'OAnimation':'oAnimationEnd',
        'MSAnimation':'MSAnimationEnd',
        'WebkitAnimation':'webkitAnimationEnd'
    };

    for(var t in transitions){
        if( transitions.hasOwnProperty(t) && el.style[t] !== undefined ){
            return transitions[t];
        }
    }
}

$("#elementToListenTo")
    .on(whichTransitionEvent(),
        function(e){
            console.log('Transition complete!  This is the callback!');
            $(this).off(e);
        });

How to set Java SDK path in AndroidStudio?

I tried updating all of my SDKs by just going into the Project Structure > Platform Settings > SDKs and changing the Java SDK, but that didn't work, so I had to recreate the configurations from scratch.

Here's how to create your SDKs with the latest Java:

In Project Structure > Platform Settings > SDKs, click the "+" button to add a new SDK.
In the pop-up, go into your Android SDK folder and click "Choose"
Another pop-up will appear asking for which SDK and JDK you want to use. Choose any Android SDK and the 1.7 JDK.
Go to Project Structure > Project Settings > Project and change your Project SDK to the one you just created. You should see the name of the SDK contain the new Java version that you installed.

jQuery: how to trigger anchor link's click event

Try the following:

$("#myanchor")[0].click()

As simple as that.

How do I recognize "#VALUE!" in Excel spreadsheets?

Use IFERROR(value, value_if_error)

Get the current script file name

$argv[0]

I've found it much simpler to use $argv[0]. The name of the executing script is always the first element in the $argv array. Unlike all other methods suggested in other answers, this method does not require the use of basename() to remove the directory tree. For example:

echo __FILE__; returns something like /my/directory/path/my_script.php
echo $argv[0]; returns my_script.php

How to find children of nodes using BeautifulSoup

"How to find all a which are children of <li class=test> but not any others?"

Given the HTML below (I added another <a> to show te difference between select and select_one):

<div>
  <li class="test">
    <a>link1</a>
    <ul>
      <li>
        <a>link2</a>
      </li>
    </ul>
    <a>link3</a>
  </li>
</div>

The solution is to use child combinator (>) that is placed between two CSS selectors:

>>> soup.select('li.test > a')
[<a>link1</a>, <a>link3</a>]

In case you want to find only the first child:

>>> soup.select_one('li.test > a')
<a>link1</a>

Checking for empty or null JToken in a JObject

You can proceed as follows to check whether a JToken Value is null

JToken token = jObject["key"];

if(token.Type == JTokenType.Null)
{
    // Do your logic
}

Execute SQL script to create tables and rows

If you have password for your dB then

mysql -u <username> -p <DBName> < yourfile.sql

How to import JSON File into a TypeScript file?

As stated in this reddit post, after Angular 7, you can simplify things to these 2 steps:

Add those three lines to compilerOptions in your tsconfig.json file:

"resolveJsonModule": true,
"esModuleInterop": true,
"allowSyntheticDefaultImports": true

Import your json data:

import myData from '../assets/data/my-data.json';

And that's it. You can now use myDatain your components/services.

Can I load a UIImage from a URL?

You can try SDWebImage, it provides:

Asynchronous loading
Caching for offline use
Place holder image to appear while loading
Works well with UITableView

Quick example:

    [cell.imageView setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

how to have two headings on the same line in html

Check my sample solution

<h5 style="float: left; width: 50%;">Employee: Employee Name</h5>
<h5 style="float: right; width: 50%; text-align: right;">Employee: Employee Name</h5>

This will divide your page into two and insert the two header elements to the right and left part equally.

Python using enumerate inside list comprehension

Or, if you don't insist on using a list comprehension:

>>> mylist = ["a","b","c","d"]
>>> list(enumerate(mylist))
[(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')]

how to pass data in an hidden field from one jsp page to another?

To pass the value you must included the hidden value value="hiddenValue" in the <input> statement like so:

<input type="hidden" id="thisField" name="inputName" value="hiddenValue">

Then you recuperate the hidden form value in the same way that you recuperate the value of visible input fields, by accessing the parameter of the request object. Here is an example:

This code goes on the page where you want to hide the value.

<form action="anotherPage.jsp" method="GET">
    <input type="hidden" id="thisField" name="inputName" value="hiddenValue">
<input type="submit">   
</form>

Then on the 'anotherPage.jsp' page you recuperate the value by calling the getParameter(String name) method of the implicit request object, as so:

<% String hidden = request.getParameter("inputName"); %>
The Hidden Value is <%=hidden %>

The output of the above script will be:

The Hidden Value is hiddenValue

Converting int to bytes in Python 3

You can use the struct's pack:

In [11]: struct.pack(">I", 1)
Out[11]: '\x00\x00\x00\x01'

The ">" is the byte-order (big-endian) and the "I" is the format character. So you can be specific if you want to do something else:

In [12]: struct.pack("<H", 1)
Out[12]: '\x01\x00'

In [13]: struct.pack("B", 1)
Out[13]: '\x01'

This works the same on both python 2 and python 3.

Note: the inverse operation (bytes to int) can be done with unpack.

What's the best visual merge tool for Git?

My favorite visual merge tool is SourceGear DiffMerge

It is free.
Cross-platform (Windows, OS X, and Linux).
Clean visual UI
All diff features you'd expect (Diff, Merge, Folder Diff).
Command line interface.
Usable keyboard shortcuts.

User interface

Not showing placeholder for input type="date" field

_x000D_

<input placeholder="Date" type="text" onMouseOver="(this.type='date')" onMouseOut="(this.type='text')"  id="date" class="form-control">

_x000D_

Revised code of mumthezir

Representing null in JSON

There is only one way to represent null; that is with null.

console.log(null === null);   // true
console.log(null === true);   // false
console.log(null === false);  // false
console.log(null === 'null'); // false
console.log(null === "null"); // false
console.log(null === "");     // false
console.log(null === []);     // false
console.log(null === 0);      // false

That is to say; if any of the clients that consume your JSON representation use the === operator; it could be a problem for them.

no value

If you want to convey that you have an object whose attribute myCount has no value:

{ "myCount": null }

no attribute / missing attribute

What if you to convey that you have an object with no attributes:

{}

Client code will try to access myCount and get undefined; it's not there.

empty collection

What if you to convey that you have an object with an attribute myCount that is an empty list:

{ "myCount": [] }

How to count items in JSON object using command line?

The shortest expression is

curl 'http://…' | jq length

How do I read CSV data into a record array in NumPy?

You can use Numpy's genfromtxt() method to do so, by setting the delimiter kwarg to a comma.

from numpy import genfromtxt
my_data = genfromtxt('my_file.csv', delimiter=',')

More information on the function can be found at its respective documentation.

Inserting values into tables Oracle SQL

You can insert into a table from a SELECT.

INSERT INTO
  Employee (emp_id, emp_name, emp_address, emp_state, emp_position, emp_manager)
SELECT
  001,
  'John Doe',
  '1 River Walk, Green Street',
  (SELECT id FROM state WHERE name = 'New York'),
  (SELECT id FROM positions WHERE name = 'Sales Executive'),
  (SELECT id FROM manager WHERE name = 'Barry Green')
FROM
  dual

Or, similarly...

INSERT INTO
  Employee (emp_id, emp_name, emp_address, emp_state, emp_position, emp_manager)
SELECT
  001,
  'John Doe',
  '1 River Walk, Green Street',
  state.id,
  positions.id,
  manager.id
FROM
  state
CROSS JOIN
  positions
CROSS JOIN
  manager
WHERE
      state.name     = 'New York'
  AND positions.name = 'Sales Executive'
  AND manager.name   = 'Barry Green'

Though this one does assume that all the look-ups exist. If, for example, there is no position name 'Sales Executive', nothing would get inserted with this version.

formGroup expects a FormGroup instance

I was facing this issue and fixed by putting a check in form attribute. This issue can happen when the FormGroup is not initialized.

<form [formGroup]="loginForm" *ngIf="loginForm">
OR
<form [formGroup]="loginForm" *ngIf="this.loginForm">

This will not render the form until it is initialized.

Django - makemigrations - No changes detected

Try registering your model in admin.py, here's an example:- admin.site.register(YourModelHere)

You can do the following things:- 1. admin.site.register(YourModelHere) # In admin.py 2. Reload the page and try again 3. Hit CTRL-S and save 4. There might be an error, specially check models.py and admin.py 5. Or, at the end of it all just restart the server

How to create a HashMap with two keys (Key-Pair, Value)?

we can create a class to pass more than one key or value and the object of this class can be used as a parameter in map.

import java.io.BufferedReader; 
import java.io.FileReader;
import java.io.IOException;
import java.util.*;

 public class key1 {
    String b;
    String a;
    key1(String a,String b)
    {
        this.a=a;
        this.b=b;
    }
  }

public class read2 {

private static final String FILENAME = "E:/studies/JAVA/ReadFile_Project/nn.txt";

public static void main(String[] args) {

    BufferedReader br = null;
    FileReader fr = null;
    Map<key1,String> map=new HashMap<key1,String>();
    try {

        fr = new FileReader(FILENAME);
        br = new BufferedReader(fr);

        String sCurrentLine;

        br = new BufferedReader(new FileReader(FILENAME));

        while ((sCurrentLine = br.readLine()) != null) {
            String[] s1 = sCurrentLine.split(",");
            key1 k1 = new key1(s1[0],s1[2]);
            map.put(k1,s1[2]);
        }
        for(Map.Entry<key1,String> m:map.entrySet()){  
            key1 key = m.getKey();
            String s3 = m.getValue();
               System.out.println(key.a+","+key.b+" : "+s3);  
              }  
  //            }   
        } catch (IOException e) {

        e.printStackTrace();

    } finally {

        try {

            if (br != null)
                br.close();

            if (fr != null)
                fr.close();

        } catch (IOException ex) {

            ex.printStackTrace();

        }

    }

    }

 }

how to install apk application from my pc to my mobile android

1.question answer-In your mobile having Developer Option in settings and enable that one. after In android studio project source file in bin--> apk file .just copy the apk file and paste in mobile memory in ur pc.. after all finished .you click that apk file in your mobile is automatically installed.

2.question answer-Your mobile is Samsung are just add Samsung Kies software in your pc..its helps to android code run in your mobile ...

Use '=' or LIKE to compare strings in SQL?

For pattern matching use LIKE. For exact match =.

document.getElementById().value and document.getElementById().checked not working for IE

The code you pasted should work... There must be something else we are not seeing here.

Check this out. Working for me fine on IE7. When you submit you will see the variable passed in the URL.

How to update json file with python

The issue here is that you've opened a file and read its contents so the cursor is at the end of the file. By writing to the same file handle, you're essentially appending to the file.

The easiest solution would be to close the file after you've read it in, then reopen it for writing.

with open("replayScript.json", "r") as jsonFile:
    data = json.load(jsonFile)

data["location"] = "NewPath"

with open("replayScript.json", "w") as jsonFile:
    json.dump(data, jsonFile)

Alternatively, you can use seek() to move the cursor back to the beginning of the file then start writing, followed by a truncate() to deal with the case where the new data is smaller than the previous.

with open("replayScript.json", "r+") as jsonFile:
    data = json.load(jsonFile)

    data["location"] = "NewPath"

    jsonFile.seek(0)  # rewind
    json.dump(data, jsonFile)
    jsonFile.truncate()

How do you count the number of occurrences of a certain substring in a SQL varchar?

DECLARE @records varchar(400)
SELECT @records = 'a,b,c,d'
select  LEN(@records) as 'Before removing Commas' , LEN(@records) - LEN(REPLACE(@records, ',', '')) 'After Removing Commans'

How to split a file into equal parts, without breaking individual lines?

I made a bash script, that given a number of parts as input, split a file

#!/bin/sh

parts_total="$2";
input="$1";

parts=$((parts_total))
for i in $(seq 0 $((parts_total-2))); do
  lines=$(wc -l "$input" | cut -f 1 -d" ")
  #n is rounded, 1.3 to 2, 1.6 to 2, 1 to 1
  n=$(awk  -v lines=$lines -v parts=$parts 'BEGIN { 
    n = lines/parts;
    rounded = sprintf("%.0f", n);
    if(n>rounded){
      print rounded + 1;
    }else{
      print rounded;
    }
  }');
  head -$n "$input" > split${i}
  tail -$((lines-n)) "$input" > .tmp${i}
  input=".tmp${i}"
  parts=$((parts-1));
done
mv .tmp$((parts_total-2)) split$((parts_total-1))
rm .tmp*

I used head and tail commands, and store in tmp files, for split the files

#10 means 10 parts
sh mysplitXparts.sh input_file 10

or with awk, where 0.1 is 10% => 10 parts, or 0.334 is 3 parts

awk -v size=$(wc -l < input) -v perc=0.1 '{
  nfile = int(NR/(size*perc)); 
  if(nfile >= 1/perc){
    nfile--;
  } 
  print > "split_"nfile
}' input

See full command of running/stopped container in Docker

TL-DR

docker ps --no-trunc and docker inspect CONTAINER provide the entrypoint executed to start the container, along the command passed to, but that may miss some parts such as ${ANY_VAR} because container environment variables are not printed as resolved.

To overcome that, docker inspect CONTAINER has an advantage because it also allow to retrieve separately env variables and their values defined in the container from the Config.Env property.

docker ps and docker inspect provide information about the executed entrypoint and its command. Often, that is a wrapper entrypoint script (.sh) and not the "real" program started by the container. To get information on that, requesting process information with ps or /proc/1/cmdline help.

1) docker ps --no-trunc

It prints the entrypoint and the command executed for all running containers. While it prints the command passed to the entrypoint (if we pass that), it doesn't show value of docker env variables (such as $FOO or ${FOO}).
If our containers use env variables, it may be not enough.

For example, run an alpine container :

docker run --name alpine-example -e MY_VAR=/var alpine:latest sh -c 'ls $MY_VAR'

When use docker -ps such as :

docker ps -a --filter name=alpine-example --no-trunc

It prints :

CONTAINER ID           IMAGE               COMMAND                CREATED             STATUS                     PORTS               NAMES
5b064a6de6d8417...   alpine:latest       "sh -c 'ls $MY_VAR'"   2 minutes ago       Exited (0) 2 minutes ago                       alpine-example

We see the command passed to the entrypoint : sh -c 'ls $MY_VAR' but $MY_VAR is indeed not resolved.

2) docker inspect CONTAINER

When we inspect the alpine-example container :

docker inspect alpine-example | grep -4 Cmd

The command is also there but we don't still see the env variable value :

        "Cmd": [
            "sh",
            "-c",
            "ls $MY_VAR"
        ],

In fact, we could not see interpolated variables with these docker commands.
While as a trade-off, we could display separately both command and env variables for a container with docker inspect :

docker inspect  alpine-example  | grep -4 -E "Cmd|Env"

That prints :

        "Env": [
            "MY_VAR=/var",
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": [
            "sh",
            "-c",
            "ls $MY_VAR"
        ]

A more docker way would be to use the --format flag of docker inspect that allows to specify JSON attributes to render :

docker inspect --format '{{.Name}} {{.Config.Cmd}}  {{ (.Config.Env) }}'  alpine-example

That outputs :

/alpine-example [sh -c ls $MY_VAR]  [MY_VAR=/var PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin]

3) Retrieve the started process from the container itself for running containers

The entrypoint and command executed by docker may be helpful but in some cases, it is not enough because that is "only" a wrapper entrypoint script (.sh) that is responsible to start the real/core process.
For example when I run a Nexus container, the command executed and shown to run the container is "sh -c ${SONATYPE_DIR}/start-nexus-repository-manager.sh".
For PostgreSQL that is "docker-entrypoint.sh postgres".

To get more information, we could execute on a running container docker exec CONTAINER ps aux.
It may print other processes that may not interest us.
To narrow to the initial process launched by the entrypoint, we could do :

docker exec CONTAINER ps -1

I specify 1 because the process executed by the entrypoint is generally the one with the 1 id.

Without ps, we could still find the information in /proc/1/cmdline (in most of Linux distros but not all). For example :

docker exec CONTAINER cat /proc/1/cmdline | sed -e "s/\x00/ /g"; echo

If we have access to the docker host that started the container, another alternative to get the full command of the process executed by the entrypoint is : : execute ps -PID where PID is the local process created by the Docker daemon to run the container such as :

ps -$(docker container inspect --format '{{.State.Pid}}'  CONTAINER)

User-friendly formatting with docker ps

docker ps --no-trunc is not always easy to read.
Specifying columns to print and in a tabular format may make it better :

docker ps   --no-trunc  --format "table{{.Names}}\t{{.CreatedAt}}\t{{.Command}}"

Create an alias may help :

alias dps='docker ps   --no-trunc  --format "table{{.Names}}\t{{.CreatedAt}}\t{{.Command}}"'

is the + operator less performant than StringBuffer.append()

Your example is not a good one in that it is very unlikely that the performance will be signficantly different. In your example readability should trump performance because the performance gain of one vs the other is negligable. The benefits of an array (StringBuffer) are only apparent when you are doing many concatentations. Even then your mileage can very depending on your browser.

Here is a detailed performance analysis that shows performance using all the different JavaScript concatenation methods across many different browsers; String Performance an Analysis

join() once, concat() once, join() for, += for, concat() for

More:
Ajaxian >> String Performance in IE: Array.join vs += continued

Dynamic array in C#

List<T> for strongly typed one, or ArrayList if you have .NET 1.1 or love to cast variables.

When using SASS how can I import a file from a different directory?

If using Web Compiler in Visual Studio you can add the path to includePath in compilerconfig.json.defaults. Then there is no need for some number of ../ since the compiler will use includePath as a location to look for the import.

For example:

"includePath": "node_modules/foundation-sites/scss",

Split page vertically using CSS

Alternatively, you can also use a special function known as the linear-gradient() function to split browser screen into two equal halves. Check out the following code snippet:

body
{
  background-image:linear-gradient(90deg, lightblue 50%, skyblue 50%);
}

Here, linear-gradient() function accepts three arguments

90deg for vertical division of screen.( Similarly, you can use 180deg for horizontal division of screen)
lightblue color is used to represent the left half of the screen.
skyblue color has been used to represent the right half of the split screen. Here, 50% has been used for equal division of the browser screen. You can use any other value if you don't want an equal division of the screen. Hope this helps. :) Happy Coding!

How to save picture to iPhone photo library?

You can use this

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
   UIImageWriteToSavedPhotosAlbum(img.image, nil, nil, nil);
});

Remove excess whitespace from within a string

none of other examples worked for me, so I've used this one:

trim(preg_replace('/[\t\n\r\s]+/', ' ', $text_to_clean_up))

this replaces all tabs, new lines, double spaces etc to simple 1 space.

How to initialise a string from NSData in Swift

This is the implemented code needed:

in Swift 3.0:

var dataString = String(data: fooData, encoding: String.Encoding.utf8)

or just

var dataString = String(data: fooData, encoding: .utf8)

Older swift version:

in Swift 2.0:

import Foundation

var dataString = String(data: fooData, encoding: NSUTF8StringEncoding)

in Swift 1.0:

var dataString = NSString(data: fooData, encoding:NSUTF8StringEncoding)

WaitAll vs WhenAll

Task.WaitAll blocks the current thread until everything has completed.

Task.WhenAll returns a task which represents the action of waiting until everything has completed.

That means that from an async method, you can use:

await Task.WhenAll(tasks);

... which means your method will continue when everything's completed, but you won't tie up a thread to just hang around until that time.

Rename a file in C#

Use:

int rename(const char * oldname, const char * newname);

The rename() function is defined in the stdio.h header file. It renames a file or directory from oldname to newname. The rename operation is the same as move, hence you can also use this function to move a file.

How to pass a parameter like title, summary and image in a Facebook sharer URL

This works at the moment (Oct. 2016), but I can't guarantee how long it will last:

https://www.facebook.com/sharer.php?caption=[caption]&description=[description]&u=[website]&picture=[image-url]

Difference Between Cohesion and Coupling

Cohesion is the indication of the relationship within a module.

Coupling is the indication of the relationships between modules.

Cohesion

Cohesion is the indication of the relationship within module.
Cohesion shows the module’s relative functional strength.
Cohesion is a degree (quality) to which a component / module focuses on the single thing.
While designing you should strive for high cohesion i.e. a cohesive component/ module focus on a single task (i.e., single-mindedness) with little interaction with other modules of the system.
Cohesion is the kind of natural extension of data hiding for example, class having all members visible with a package having default visibility. Cohesion is Intra – Module Concept.

Coupling

Coupling is the indication of the relationships between modules.
Coupling shows the relative dependence/interdependence among the modules.
Coupling is a degree to which a component / module is connected to the other modules.
While designing you should strive for low coupling i.e. dependency between modules should be less
Making private fields, private methods and non public classes provides loose coupling.
Coupling is Inter -Module Concept.

check this link

How to lookup JNDI resources on WebLogic?

You should be able to simply do this:

Context context = new InitialContext();
dataSource = (javax.sql.DataSource) context.lookup("jdbc/myDataSource");

If you are looking it up from a remote destination you need to use the WL initial context factory like this:

Hashtable<String, String> h = new Hashtable<String, String>(7);
h.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
h.put(Context.PROVIDER_URL, pURL); //For example "t3://127.0.0.1:7001"
h.put(Context.SECURITY_PRINCIPAL, pUsername);
h.put(Context.SECURITY_CREDENTIALS, pPassword);

InitialContext context = new InitialContext(h);
dataSource = (javax.sql.DataSource) context.lookup("jdbc/myDataSource");

weblogic.jndi.WLInitialContextFactory

Rounding BigDecimal to always have two decimal places

value = value.setScale(2, RoundingMode.CEILING)

Can't operator == be applied to generic types in C#?

In general, EqualityComparer<T>.Default.Equals should do the job with anything that implements IEquatable<T>, or that has a sensible Equals implementation.

If, however, == and Equals are implemented differently for some reason, then my work on generic operators should be useful; it supports the operator versions of (among others):

Equal(T value1, T value2)
NotEqual(T value1, T value2)
GreaterThan(T value1, T value2)
LessThan(T value1, T value2)
GreaterThanOrEqual(T value1, T value2)
LessThanOrEqual(T value1, T value2)

WPF: Grid with column/row margin/padding?

One possibility would be to add fixed width rows and columns to act as the padding / margin you are looking for.

You might also consider that you are constrained by the size of your container, and that a grid will become as large as the containing element or its specified width and height. You could simply use columns and rows with no width or height set. That way they default to evenly breaking up the total space within the grid. Then it would just be a mater of centering your elements vertically and horizontally within you grid.

Another method might be to wrap all grid elements in a fixed with single row & column grid that has a fixed size and margin. That your grid contains fixed width / height boxes which contain your actual elements.

Try-catch block in Jenkins pipeline script

This answer worked for me:

pipeline {
  agent any
  stages {
    stage("Run unit tests"){
      steps {
        script {
          try {
            sh  '''
              # Run unit tests without capturing stdout or logs, generates cobetura reports
              cd ./python
              nosetests3 --with-xcoverage --nocapture --with-xunit --nologcapture --cover-package=application
              cd ..
              '''
          } finally {
            junit 'nosetests.xml'
          }
        }
      }
    }
    stage ('Speak') {
      steps{
        echo "Hello, CONDITIONAL"
      }
    }
  }
}

complex if statement in python

I think the most pythonic way to do this for me, will be

elif var in [80,443] + range(1024,65535):

although it could take a little time and memory (it's generating numbers from 1024 to 65535). If there's a problem with that, I'll do:

elif 1024 <= var <= 65535 or var in [80,443]:

Replace part of a string with another string

std::string replace(std::string base, const std::string from, const std::string to) {
    std::string SecureCopy = base;

    for (size_t start_pos = SecureCopy.find(from); start_pos != std::string::npos; start_pos = SecureCopy.find(from,start_pos))
    {
        SecureCopy.replace(start_pos, from.length(), to);
    }

    return SecureCopy;
}

How do you define a class of constants in Java?

Just use final class.

If you want to be able to add other values use an abstract class.

It doesn't make much sense using an interface, an interface is supposed to specify a contract. You just want to declare some constant values.

What is the Oracle equivalent of SQL Server's IsNull() function?

Also use NVL2 as below if you want to return other value from the field_to_check:

NVL2( field_to_check, value_if_NOT_null, value_if_null )

Usage: ORACLE/PLSQL: NVL2 FUNCTION

Insert string at specified position

Strange answers here! You can insert strings into other strings easily with sprintf [link to documentation]. The function is extremely powerful and can handle multiple elements and other data types too.

$color = 'green';
sprintf('I like %s apples.', $color);

gives you the string

I like green apples.

Wavy shape with css

Recently an awesome tool called Get Waves was introduced where you can simply from UI create your own waves and then export this to SVG format. This is as simple as going to the https://getwaves.io/ website and enjoying it!

Edit:

Recently I've discovered also a new tool - https://shapedivider.app/

How to filter for multiple criteria in Excel?

You can pass an array as the first AutoFilter argument and use the xlFilterValues operator.

This will display PDF, DOC and DOCX filetypes.

Criteria1:=Array(".pdf", ".doc", ".docx"), Operator:=xlFilterValues

How to remove leading zeros from alphanumeric text?

If you don't want to use regex or external library. You can do with "for":

String input="0000008008451"
String output = input.trim();
for( ;output.length() > 1 && output.charAt(0) == '0'; output = output.substring(1));

System.out.println(output);//8008451

How to copy directory recursively in python and overwrite all?

My simple answer.

def get_files_tree(src="src_path"):
    req_files = []
    for r, d, files in os.walk(src):
        for file in files:
            src_file = os.path.join(r, file)
            src_file = src_file.replace('\\', '/')
            if src_file.endswith('.db'):
                continue
            req_files.append(src_file)

    return req_files
def copy_tree_force(src_path="",dest_path=""):
    """
    make sure that all the paths has correct slash characters.
    """
    for cf in get_files_tree(src=src_path):
        df= cf.replace(src_path, dest_path)
        if not os.path.exists(os.path.dirname(df)):
            os.makedirs(os.path.dirname(df))
        shutil.copy2(cf, df)

C# Java HashMap equivalent

Use Dictionary - it uses hashtable but is typesafe.

Also, your Java code for

int a = map.get(key);
//continue with your logic

will be best coded in C# this way:

int a;
if(dict.TryGetValue(key, out a)){
//continue with your logic
}

This way, you can scope the need of variable "a" inside a block and it is still accessible outside the block if you need it later.

Java Keytool error after importing certificate , "keytool error: java.io.FileNotFoundException & Access Denied"

I got this error too even I ran cmd as an Administrator.

The root cause is: The file is from VCS(subversion, perforce, etc.), and when I checked the properties of this file, its' Attributes is Read-only.

So the solution is:

(1) disable the 'Read-only' Attribute;
(2) check out from VCS, let the file under the status of read&write.

How can I use Google's Roboto font on a website?

Spent an hour, fixing the font issues.

Related answer - Below is for React.js website:

Install the npm module:

npm install --save typeface-roboto-mono
import in .js file you want to use
one of the below:

import "typeface-roboto-mono"; // if import is supported
require('typeface-roboto-mono') // if import is not supported
For the element you can use
one of the below:

fontFamily: "Roboto Mono, Menlo, Monaco, Courier, monospace", // material-ui
font-family: Roboto Mono, Menlo, Monaco, Courier, monospace; /* css */
style="font-family:Roboto Mono, Menlo, Monaco, Courier, monospace;font-weight:300;" /*inline css*/

Hope that helps.

How to avoid a System.Runtime.InteropServices.COMException?

I came across System.Runtime.InteropServices.COMException while opening a project solution. Sometimes user doesn't have enough priveleges to run some COM Methods. I ran Visual Studio as Administrator and the exception was gone.

RadioGroup: How to check programmatically

I prefer to use

RadioButton b = (RadioButton) findViewById(R.id.option1);
b.performClick();

instead of using the accepted answer.

RadioButton b = (RadioButton) findViewById(R.id.option1);
b.setChecked(true);

The reason is setChecked(true) only changes the checked state of radio button. It does not trigger the onClick() method added to your radio button. Sometimes this might waste your time to debug why the action related to onClick() not working.

How to make responsive table

For make responsive table you can make 100% of each ‘td’ and insert related heading in the ‘td’ on the mobile(less the ’768px’ width).

See More:
http://wonderdesigners.com/?p=227

Best Practice to Use HttpClient in Multithreaded Environment

My reading of the docs is that HttpConnection itself is not treated as thread safe, and hence MultiThreadedHttpConnectionManager provides a reusable pool of HttpConnections, you have a single MultiThreadedHttpConnectionManager shared by all threads and initialised exactly once. So you need a couple of small refinements to option A.

MultiThreadedHttpConnectionManager connman = new MultiThreadedHttpConnectionManag

Then each thread should be using the sequence for every request, getting a conection from the pool and putting it back on completion of its work - using a finally block may be good. You should also code for the possibility that the pool has no available connections and process the timeout exception.

HttpConnection connection = null
try {
    connection = connman.getConnectionWithTimeout(
                        HostConfiguration hostConfiguration, long timeout) 
    // work
} catch (/*etc*/) {/*etc*/} finally{
    if ( connection != null )
        connman.releaseConnection(connection);
}

As you are using a pool of connections you won't actually be closing the connections and so this should not hit the TIME_WAIT problem. This approach does assuume that each thread doesn't hang on to the connection for long. Note that conman itself is left open.

Creating a select box with a search option

Here's a handy open source library I made earlier that uses jQuery: https://bitbucket.org/warwick/searchablelist/src/master/ And here is a working copy on my VPS: http://developersfound.com/SearchableList/ The library is highly customisable with overridable behavours and can have seperate designs on the same web page Hope this helps

Auto height of div

div's will naturally resize in accordance with their content.

If you set no height on your div, it will expand to contain its conent.

An exception to this rule is when the div contains floating elements. If this is the case you'll need to do a bit extra to ensure that the containing div (wrapper) clears the floats.

Here's some ways to do this:

#wrapper{
overflow:hidden;
}

#wrapper:after
{
content:".";
display:block;
clear:both;
visibility:hidden;
}

Function that creates a timestamp in c#

You can also use

Stopwatch.GetTimestamp().ToString();

Vertical Tabs with JQuery?

I wouldn't expect vertical tabs to need different Javascript from horizontal tabs. The only thing that would be different is the CSS for presenting the tabs and content on the page. JS for tabs generally does no more than show/hide/maybe load content.

unable to start mongodb local server

OS X. Activity Monitor, look for mongod, cross it . then run again mongod. problem Solved.

How to convert hex to ASCII characters in the Linux shell?

I used to do this using xxd

echo -n 5a | xxd -r -p

But then I realised that in Debian/Ubuntu, xxd is part of vim-common and hence might not be present in a minimal system. To also avoid perl (imho also not part of a minimal system) I ended up using sed, xargs and printf like this:

echo -n 5a | sed 's/\([0-9A-F]\{2\}\)/\\\\\\x\1/gI' | xargs printf

Mostly I only want to convert a few bytes and it's okay for such tasks. The advantage of this solution over the one of ghostdog74 is, that this can convert hex strings of arbitrary lengths automatically. xargs is used because printf doesnt read from standard input.

How do you perform a left outer join using linq extension methods

Turning Marc Gravell's answer into an extension method, I made the following.

internal static IEnumerable<Tuple<TLeft, TRight>> LeftJoin<TLeft, TRight, TKey>(
    this IEnumerable<TLeft> left,
    IEnumerable<TRight> right,
    Func<TLeft, TKey> selectKeyLeft,
    Func<TRight, TKey> selectKeyRight,
    TRight defaultRight = default(TRight),
    IEqualityComparer<TKey> cmp = null)
{
    return left.GroupJoin(
            right,
            selectKeyLeft,
            selectKeyRight,
            (x, y) => new Tuple<TLeft, IEnumerable<TRight>>(x, y),
            cmp ?? EqualityComparer<TKey>.Default)
        .SelectMany(
            x => x.Item2.DefaultIfEmpty(defaultRight),
            (x, y) => new Tuple<TLeft, TRight>(x.Item1, y));
}

How to get input field value using PHP

If its a get request use, $_GET['subject'] or if its a post request use, $_POST['subject']

How to format column to number format in Excel sheet?

Sorry to bump an old question but the answer is to count the character length of the cell and not its value.

CellCount = Cells(Row, 10).Value
If Len(CellCount) <= "13" Then
'do something
End If

hope that helps. Cheers

how to calculate binary search complexity

Since we cut down a list in to half every time therefore we just need to know in how many steps we get 1 as we go on dividing a list by two. In the under given calculation x denotes the numbers of time we divide a list until we get one element(In Worst Case).

1 = N/2x

2x = N

Taking log2

log2(2x) = log2(N)

x*log2(2) = log2(N)

x = log2(N)

How do I access nested HashMaps in Java?

You can do it like you assumed. But your HashMap has to be templated:

Map<String, Map<String, String>> map = 
    new HashMap<String, Map<String, String>>();

Otherwise you have to do a cast to Map after you retrieve the second map from the first.

Map map = new HashMap();
((Map)map.get( "keyname" )).get( "nestedkeyname" );

What is the syntax for an inner join in LINQ to SQL?

And because I prefer the expression chain syntax, here is how you do it with that:

var dealerContracts = DealerContact.Join(Dealer, 
                                 contact => contact.DealerId,
                                 dealer => dealer.DealerId,
                                 (contact, dealer) => contact);

How to pass optional arguments to a method in C++?

To follow the example given here, but to clarify syntax with the use of header files, the function forward declaration contains the optional parameter default value.

myfile.h

void myfunc(int blah, int mode = 0);

myfile.cpp

void myfunc(int blah, int mode) /* mode = 0 */
{
    if (mode == 0)
        do_something();
     else
        do_something_else();
}

Error type 3 Error: Activity class {} does not exist

I have a Samsung Galaxy. Searching in the settings above didn't work because it didn't show up at all in my Apps settings.

I found the application on my phone by typing the name of the app in the search field. I realized it was in the "Work"(using Mobile@Work) profile and removed it. You can find the settings for the profile by going to Settings->Work profile->Apps

I hope this helps somebody who may not find it the same way that many of the other answers stated it could be found in the settings.

How do I reference a cell within excel named range?

To read a particular date from range EJ_PAYDATES_2021 (index is next to the last "1")

=INDEX(PayDates.xlsx!EJ_PAYDATES_2021,1,1)  // Jan
=INDEX(PayDates.xlsx!EJ_PAYDATES_2021,2,1)  // Feb
=INDEX(PayDates.xlsx!EJ_PAYDATES_2021,3,1)  // Mar

This allows reading a particular element of a range [0] etc from another spreadsheet file. Target file need not be open. Range in the above example is named EJ_PAYDATES_2021, with one element for each month contained within that range.

Took me a while to parse this out, but it works, and is the answer to the question asked above.

Example for boost shared_mutex (multiple reads/one write)?

It looks like you would do something like this:

boost::shared_mutex _access;
void reader()
{
  // get shared access
  boost::shared_lock<boost::shared_mutex> lock(_access);

  // now we have shared access
}

void writer()
{
  // get upgradable access
  boost::upgrade_lock<boost::shared_mutex> lock(_access);

  // get exclusive access
  boost::upgrade_to_unique_lock<boost::shared_mutex> uniqueLock(lock);
  // now we have exclusive access
}

How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops

I don't want to have to enable a reference library as I need my scripts to be portable. The Dim foo As New VBScript_RegExp_55.RegExp line caused User Defined Type Not Defined errors, but I found a solution that worked for me.

Update RE comments w/ @chrisneilsen :

I was under the impression that enabling a reference library was tied to the local computers settings, but it is in fact, tied directly to the workbook. So, you can enable a reference library, share a macro enabled workbook and the end user wouldn't have to enable the library as well. Caveat: The advantage to Late Binding is that the developer does not have to worry about the wrong version of an object library being installed on the user's computer. This likely would not be an issue w/ the VBScript_RegExp_55.RegExp library, but I'm not sold that the "performance" benifit is worth it for me at this time, as we are talking imperceptible milliseconds in my code. I felt this deserved an update to help others understand. If you enable the reference library, you can use "early bind", but if you don't, as far as I can tell, the code will work fine, but you need to "late bind" and loose on some performance/debugging features.

Source: https://peltiertech.com/Excel/EarlyLateBinding.html

What you'll want to do is put an example string in cell A1, then test your strPattern. Once that's working adjust then rng as desired.

Public Sub RegExSearch()
'https://stackoverflow.com/questions/22542834/how-to-use-regular-expressions-regex-in-microsoft-excel-both-in-cell-and-loops
'https://wellsr.com/vba/2018/excel/vba-regex-regular-expressions-guide/
'https://www.vitoshacademy.com/vba-regex-in-excel/
    Dim regexp As Object
    'Dim regex As New VBScript_RegExp_55.regexp 'Caused "User Defined Type Not Defined" Error
    Dim rng As Range, rcell As Range
    Dim strInput As String, strPattern As String
    
    Set regexp = CreateObject("vbscript.regexp")
    Set rng = ActiveSheet.Range("A1:A1")
        
    strPattern = "([a-z]{2})([0-9]{8})"
    'Search for 2 Letters then 8 Digits Eg: XY12345678 = Matched

    With regexp
        .Global = False
        .MultiLine = False
        .ignoreCase = True
        .Pattern = strPattern
    End With

    For Each rcell In rng.Cells

        If strPattern <> "" Then
            strInput = rcell.Value

            If regexp.test(strInput) Then
                MsgBox rcell & " Matched in Cell " & rcell.Address
            Else
                MsgBox "No Matches!"
            End If
        End If
    Next
End Sub

Can anybody tell me details about hs_err_pid.log file generated when Tomcat crashes?

A very very good document regarding this topic is Troubleshooting Guide for Java from (originally) Sun. See the chapter "Troubleshooting System Crashes" for information about hs_err_pid* Files.

See Appendix C - Fatal Error Log

Per the guide, by default the file will be created in the working directory of the process if possible, or in the system temporary directory otherwise. A specific location can be chosen by passing in the -XX:ErrorFile product flag. It says:

If the -XX:ErrorFile= file flag is not specified, the system attempts to create the file in the working directory of the process. In the event that the file cannot be created in the working directory (insufficient space, permission problem, or other issue), the file is created in the temporary directory for the operating system.

SSL: CERTIFICATE_VERIFY_FAILED with Python3

I have a lib what use https://requests.readthedocs.io/en/master/ what use https://pypi.org/project/certifi/ but I have a custom CA included in my /etc/ssl/certs.

So I solved my problem like this:

# Your TLS certificates directory (Debian like)
export SSL_CERT_DIR=/etc/ssl/certs
# CA bundle PATH (Debian like again)
export CA_BUNDLE_PATH="${SSL_CERT_DIR}/ca-certificates.crt"
# If you have a virtualenv:
. ./.venv/bin/activate
# Get the current certifi CA bundle
CERTFI_PATH=`python -c 'import certifi; print(certifi.where())'`

test -L $CERTFI_PATH || rm $CERTFI_PATH
test -L $CERTFI_PATH || ln -s $CA_BUNDLE_PATH $CERTFI_PATH

Et voilà !

C++ cout hex values?

std::hex gets you the hex formatting, but it is a stateful option, meaning you need to save and restore state or it will impact all future output.

Naively switching back to std::dec is only good if that's where the flags were before, which may not be the case, particularly if you're writing a library.

#include <iostream>
#include <ios>

...

std::ios_base::fmtflags f( cout.flags() );  // save flags state
std::cout << std::hex << a;
cout.flags( f );  // restore flags state

This combines Greg Hewgill's answer and info from another question.

JSON.NET Error Self referencing loop detected for type

Fix 1: Ignoring circular reference globally

(I have chosen/tried this one, as have many others)

The json.net serializer has an option to ignore circular references. Put the following code in WebApiConfig.cs file:

 config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling 
= Newtonsoft.Json.ReferenceLoopHandling.Ignore;

The simple fix will make serializer to ignore the reference which will cause a loop. However, it has limitations:

The data loses the looping reference information
The fix only applies to JSON.net
The level of references can't be controlled if there is a deep reference chain

If you want to use this fix in a non-api ASP.NET project, you can add the above line to Global.asax.cs, but first add:

var config = GlobalConfiguration.Configuration;

If you want to use this in .Net Core project, you can change Startup.cs as:

  var mvc = services.AddMvc(options =>
        {
           ...
        })
        .AddJsonOptions(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);

Fix 2: Preserving circular reference globally

This second fix is similar to the first. Just change the code to:

config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling 
     = Newtonsoft.Json.ReferenceLoopHandling.Serialize;     
config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling 
     = Newtonsoft.Json.PreserveReferencesHandling.Objects;

The data shape will be changed after applying this setting.

[
   {
      "$id":"1",
      "Category":{
         "$id":"2",
         "Products":[
            {
               "$id":"3",
               "Category":{
                  "$ref":"2"
               },
               "Id":2,
               "Name":"Yogurt"
            },
            {
               "$ref":"1"
            }
         ],
         "Id":1,
         "Name":"Diary"
      },
      "Id":1,
      "Name":"Whole Milk"
   },
   {
      "$ref":"3"
   }
]

The $id and $ref keeps the all the references and makes the object graph level flat, but the client code needs to know the shape change to consume the data and it only applies to JSON.NET serializer as well.

Fix 3: Ignore and preserve reference attributes

This fix is decorate attributes on model class to control the serialization behavior on model or property level. To ignore the property:

 public class Category 
    { 
        public int Id { get; set; } 
        public string Name { get; set; } 
       
        [JsonIgnore] 
        [IgnoreDataMember] 
        public virtual ICollection<Product> Products { get; set; } 
    }

JsonIgnore is for JSON.NET and IgnoreDataMember is for XmlDCSerializer. To preserve reference:

 // Fix 3 
        [JsonObject(IsReference = true)] 
        public class Category 
        { 
            public int Id { get; set; } 
            public string Name { get; set; } 
         
           // Fix 3 
           //[JsonIgnore] 
           //[IgnoreDataMember] 
           public virtual ICollection<Product> Products { get; set; } 
       } 
        
       [DataContract(IsReference = true)] 
       public class Product 
       { 
           [Key] 
           public int Id { get; set; } 
        
           [DataMember] 
           public string Name { get; set; } 
        
           [DataMember] 
           public virtual Category Category { get; set; } 
       }

JsonObject(IsReference = true)] is for JSON.NET and [DataContract(IsReference = true)] is for XmlDCSerializer. Note that: after applying DataContract on class, you need to add DataMember to properties that you want to serialize.

The attributes can be applied on both json and xml serializer and gives more controls on model class.

How can I pause setInterval() functions?

Why not use a simpler approach? Add a class!

Simply add a class that tells the interval not to do anything. For example: on hover.

_x000D_

var i = 0;_x000D_
this.setInterval(function() {_x000D_
  if(!$('#counter').hasClass('pauseInterval')) { //only run if it hasn't got this class 'pauseInterval'_x000D_
    console.log('Counting...');_x000D_
    $('#counter').html(i++); //just for explaining and showing_x000D_
  } else {_x000D_
    console.log('Stopped counting');_x000D_
  }_x000D_
}, 500);_x000D_
_x000D_
/* In this example, I'm adding a class on mouseover and remove it again on mouseleave. You can of course do pretty much whatever you like */_x000D_
$('#counter').hover(function() { //mouse enter_x000D_
    $(this).addClass('pauseInterval');_x000D_
  },function() { //mouse leave_x000D_
    $(this).removeClass('pauseInterval');_x000D_
  }_x000D_
);_x000D_
_x000D_
/* Other example */_x000D_
$('#pauseInterval').click(function() {_x000D_
  $('#counter').toggleClass('pauseInterval');_x000D_
});

_x000D_

body {_x000D_
  background-color: #eee;_x000D_
  font-family: Calibri, Arial, sans-serif;_x000D_
}_x000D_
#counter {_x000D_
  width: 50%;_x000D_
  background: #ddd;_x000D_
  border: 2px solid #009afd;_x000D_
  border-radius: 5px;_x000D_
  padding: 5px;_x000D_
  text-align: center;_x000D_
  transition: .3s;_x000D_
  margin: 0 auto;_x000D_
}_x000D_
#counter.pauseInterval {_x000D_
  border-color: red;  _x000D_
}

_x000D_

<!-- you'll need jQuery for this. If you really want a vanilla version, ask -->_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
_x000D_
<p id="counter">&nbsp;</p>_x000D_
<button id="pauseInterval">Pause</button></p>

_x000D_

I've been looking for this fast and easy approach for ages, so I'm posting several versions to introduce as many people to it as possible.

White space showing up on right side of page when background image should extend full length of page

Debug your CSS for Ghost CSS Elements.

Use this bookmark to debug your CSS: https://blog.wernull.com/2013/04/debug-ghost-css-elements-causing-unwanted-scrolling/

Or add the CSS directly yourself:

* {
  background: #000 !important;
  color: #0f0 !important;
  outline: solid #f00 1px !important;
}

In my case a Facebook Like Button caused the problem.

How to make JQuery-AJAX request synchronous

It's as simple as the one below, and works like a charm.

My solution perfectly answers your question: How to make JQuery-AJAX request synchronous

Set ajax to synchronous before the ajax call, and then reset it after your ajax call:

$.ajaxSetup({async: false});

$ajax({ajax call....});

$.ajaxSetup({async: true});

In your case it would look like this:

$.ajaxSetup({async: false});

$.ajax({
        type: "POST",
        async: "false",
        url: "checkpass.php",
        data: "password="+password,
        success: function(html) {
            var arr=$.parseJSON(html);
            if(arr == "Successful") {
                return true;
            } else {
                return false;
            }
        }
    });


$.ajaxSetup({async: true});

I hope it helps :)

og:type and valid values : constantly being parsed as og:type=website

I know this is an old one but it comes up top of Google and all the links provided now seem out of date.

This is the latest list of types Facebook accepts: https://developers.facebook.com/docs/reference/opengraph

If you don't use one of these then the type will default to 'website' which is best used for home pages/summarising a web site.

In answer to the OP you would now want to use a place which will allow you to add lat/long location details.

undefined reference to WinMain@16 (codeblocks)

You need to open the project file of your program and it should appear on Management panel.
Right click on the project file, then select add file. You should add the 3 source code (secrypt.h, secrypt.cpp, and the trial.cpp)
Compile and enjoy. Hope, I could help you.

No server in windows>preferences

You did not install the correct Eclipse distribution. Try install the one labeled "Eclipse IDE for Java EE Developers".

How to generate UML diagrams (especially sequence diagrams) from Java code?

How about PlantUML? It's not for reverse engineering!!! It's for engineering before you code.

Predicate Delegates in C#

Leading on from Andrew's answer with regards to c#2 and c#3 ... you can also do them inline for a one off search function (see below).

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list = new List<int> { 1, 2, 3 };

        List<int> newList = list.FindAll(delegate(int arg)
                           {
                               return arg> 2;
                           });
    }
}

Hope this helps.

Plot bar graph from Pandas DataFrame

To plot just a selection of your columns you can select the columns of interest by passing a list to the subscript operator:

ax = df[['V1','V2']].plot(kind='bar', title ="V comp", figsize=(15, 10), legend=True, fontsize=12)

What you tried was df['V1','V2'] this will raise a KeyError as correctly no column exists with that label, although it looks funny at first you have to consider that your are passing a list hence the double square brackets [[]].

import matplotlib.pyplot as plt
ax = df[['V1','V2']].plot(kind='bar', title ="V comp", figsize=(15, 10), legend=True, fontsize=12)
ax.set_xlabel("Hour", fontsize=12)
ax.set_ylabel("V", fontsize=12)
plt.show()

enter image description here

Upload files from Java client to a HTTP server

It could depend on your framework. (for each of them could exist an easier solution).

But to answer your question: there are a lot of external libraries for this functionality. Look here how to use apache commons fileupload.

Programs & Examples On #Escript

Crop image to specified size and picture location

Pass PDO prepared statement to variables

Instantiating a generic type

java doesn't run if structure inside of onclick listener

Autoresize View When SubViews are Added

Generating a list of pages (not posts) without the index file

Warp \ bend effect on a UIView?

Read input from a JOptionPane.showInputDialog box

Uploading into folder in FTP?

Call japplet from jframe

xlrd.biffh.XLRDError: Excel xlsx file; not supported

Target class controller does not exist - Laravel 8

iPhone is not available. Please reconnect the device

DevTools failed to load SourceMap: Could not load content for chrome-extension

error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class

error TS1086: An accessor cannot be declared in an ambient context in Angular 9

TS1086: An accessor cannot be declared in ambient context

Maven dependencies are failing with a 501 error

Visual Studio Code PHP Intelephense Keep Showing Not Necessary Error

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

Invalid hook call. Hooks can only be called inside of the body of a function component

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

Alternative syntax

Access blocked by CORS policy: Response to preflight request doesn't pass access control check

Errors: Data path ".builders['app-shell']" should have required property 'class'

Why am I getting Unknown error in line 1 of pom.xml?

The POST method is not supported for this route. Supported methods: GET, HEAD. Laravel

The iOS Simulator deployment targets is set to 7.0, but the range of supported deployment target version for this platform is 8.0 to 12.1

Typescript: Type 'string | undefined' is not assignable to type 'string'

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

useState set method not reflecting change immediately

Solutions:

Explanation why it happens:

Can't perform a React state update on an unmounted component

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

TypeScript and React - children type?

ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.2.0 but 3.2.1 was found instead

React Hook Warnings for async function in useEffect: useEffect function must return a cleanup function or nothing

Xcode 10.2.1 Command PhaseScriptExecution failed with a nonzero exit code

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory in ionic 3

A fatal error occurred while creating a TLS client credential. The internal error state is 10013

How to set width of mat-table column in angular?

IntelliJ can't recognize JavaFX 11 with OpenJDK 11

What is "not assignable to parameter of type never" error in typescript?

Support for the experimental syntax 'classProperties' isn't currently enabled

How to convert string to boolean in typescript Angular 4

What is the Record type in typescript?

Real-world React example.

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

Under which circumstances textAlign property works in Flutter?

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0

Confirm password validation in Angular 6

Rounded Corners Image in Flutter

Couldn't process file resx due to its being in the Internet or Restricted zone or having the mark of the web on the file

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured

How to use `@ts-ignore` for a block

Everytime I run gulp anything, I get a assertion error. - Task function must be specified

Handling back button in Android Navigation Component

Select default option value from typescript angular 6

Vue.js get selected option on @change

Google Maps shows "For development purposes only"

How to add image in Flutter

Authentication plugin 'caching_sha2_password' is not supported

Flutter Circle Design

java.lang.NoClassDefFoundError:failed resolution of :Lorg/apache/http/ProtocolVersion

Can not find module “@angular-devkit/build-angular”

Could not find module "@angular-devkit/build-angular"

Can't bind to 'dataSource' since it isn't a known property of 'table'

ERROR Error: StaticInjectorError(AppModule)[UserformService -> HttpClient]:

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