Tutorial by Examples: d

{ "name": "my-project", "version": "0.0.1", "description": "This is a project.", "author": "Someone <[email protected]>", "contributors": [{ "name": "Som...

"dependencies": { "module-name": "0.1.0" } exact: 0.1.0 will install that specific version of the module. newest minor version: ^0.1.0 will install the newest minor version, for example 0.2.0, but won't install a module with a higher major version e.g. 1.0.0 newe...

This command will drop index in the table. It works on SAP ASE server. Syntax: DROP INDEX [table name].[index name] Example: DROP INDEX Cars.index_1

Look at the contents of /etc/redhat-release cat /etc/redhat-release Here is the output from a Fedora 24 machine: Fedora release 24 (Twenty Four) As mentioned in the debian-based response, you can also use the lsb_release -a command, which outputs this from a Fedora 24 machine: LSB Version: ...

Post::find()->all(); // SELECT * FROM post or the shorthand (Returns an active record model instance by a primary key or an array of column values.) Post::findAll(condition); returns an array of ActiveRecord instances. Find All with where Condition $model = User::find() ->w...

<?php namespace models; use yii\db\ActiveRecord; use yii\behaviors\TimestampBehavior; class Post extends ActiveRecord { public static function tableName() { return 'post'; } public function rules() { ...

You have to keep the operator precedence in mind when using await keyword. Imagine that we have an asynchronous function which calls another asynchronous function, getUnicorn() which returns a Promise that resolves to an instance of class Unicorn. Now we want to get the size of the unicorn using th...

async functions do not replace the Promise type; they add language keywords that make promises easier to call. They are interchangeable: async function doAsyncThing() { ... } function doPromiseThing(input) { return new Promise((r, x) => ...); } // Call with promise syntax doAsyncThing() ...

The second value in the curly braces dictates the length of the replacement string. By adjusting the second value to be positive or negative, the alignment of the string can be changed. string.Format("LEFT: string: ->{0,-5}<- int: ->{1,-5}<-", "abc", 123); string....

Use existing .NET classes instantly with PowerShell by using [class]::Method(args): PS C:\> [guid]::NewGuid() Guid ---- 8874a185-64be-43ed-a64c-d2fe4b6e31bc Similarly, in PowerShell 5+ you may use the New-Guid cmdlet: PS C:\> New-Guid Guid ---- 8874a185-64be-43ed-a64c-d2fe4b6e31...

import std.stdio; // Let's get going! void main() { writeln("Hello World!"); } To compile and run, save this text as a file called main.d. From the command line run dmd main.d to compile the program. Finally, run ./main to execute the program in a bash shell or you can click ...

If value types are assigned to variables of type object they are boxed - the value is stored in an instance of a System.Object. This can lead to unintended consequences when comparing values with ==, e.g.: object left = (int)1; // int in an object box object right = (int)1; // int in an object bo...

Boxed value types can only be unboxed into their original Type, even if a conversion of the two Types is valid, e.g.: object boxedInt = (int)1; // int boxed in an object long unboxedInt1 = (long)boxedInt; // invalid cast This can be avoided by first unboxing into the original Type, e.g.: lon...

The fetch function does not send cookies by default. There are two possible ways to send cookies: Only send cookies if the URL is on the same origin as the calling script. fetch('/login', { credentials: 'same-origin' }) Always send cookies, even for cross-origin calls. fetch('htt...

The Protractor API allows CSS element locators to use the jQuery-like shortcut notation $(). Normal CSS Element Locator: element(by.css('h1.documentation-text[ng-bind="title"]')); element(by.css('[ng-click="submit"])); Shortcut $() CSS Element Locator: $('h1.documentatio...

This example shows how to check permissions at runtime in Android 6 and later. public static final int MULTIPLE_PERMISSIONS = 10; // code you want. String[] permissions = new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA, Manifest.permission.ACC...

The GridLayout allows you to arrange components in the form of a grid. You pass the number of rows and columns you want the grid to have to the GridLayout's constructor, for example new GridLayout(3, 2) will create a GridLayout with 3 rows and 2 columns. When adding components to a container with ...

Examples below are given in Ruby, but same matchers should be available in any modern language. Let’s say we have the string "AℵNaïve", produced by Messy Artificial Intelligence. It consists of letters, but generic \w matcher won’t match much: ▶ "AℵNaïve"[/\w+/] #⇒ "A&q...

This example shows, how to make a UIView or UIImageView, rounded with some radius like this: Objective-C someImageView.layer.cornerRadius = CGRectGetHeight(someImageView.frame) / 2; someImageView.clipsToBounds = YES; Swift someImageView.layer.cornerRadius = someImageView.frame.height/2 // ...

Create a circle image with glide. public class CircleTransform extends BitmapTransformation { public CircleTransform(Context context) { super(context); } @Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) { ret...