Tutorial by Examples: l

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 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...

The splice()method can be used to remove elements from an array. In this example, we remove the first 3 from the array. var values = [1, 2, 3, 4, 5, 3]; var i = values.indexOf(3); if (i >= 0) { values.splice(i, 1); } // [1, 2, 4, 5, 3] The splice() method can also be used to add elemen...

function foo() { console.trace('My log statement'); } foo(); Will display this in the console: My log statement VM696:1 foo @ VM696:1 (anonymous function) @ (program):1 Note: Where available it's also useful to know that the same stack trace is accessible a...

It is worth noting that in swift, unlike other languages people are familiar with, there is an implicit break at the end of each case statement. In order to follow through to the next case (i.e. have multiple cases execute) you need to use fallthrough statement. switch(value) { case 'one': //...

public static void Main() { var xml = new XmlDocument(); var root = xml.CreateElement("element"); // Creates an attribute, so the element will now be "<element attribute='value' />" root.SetAttribute("attribute", "value"); ...

In this example database for a library, we have Authors, Books and BooksAuthors tables. Live example: SQL fiddle Authors and Books are known as base tables, since they contain column definition and data for the actual entities in the relational model. BooksAuthors is known as the relationship tabl...

ALTER TABLE Employees ALTER COLUMN StartingDate DATETIME NOT NULL DEFAULT (GETDATE()) This query will alter the column datatype of StartingDate and change it from simple date to datetime and set default to current date.

The editor.apply() method is asynchronous, while editor.commit() is synchronous. Obviously, you should call either apply() or commit(). 2.3 SharedPreferences settings = getSharedPreferences(PREFS_FILE, MODE_PRIVATE); SharedPreferences.Editor editor = settings.edit(); editor.putBoolean(PREF_CONS...

In Python 2, an octal literal could be defined as >>> 0755 # only Python 2 To ensure cross-compatibility, use 0o755 # both Python 2 and Python 3

Use the Bash shell's filename expansion and brace expansion capabilities to obtain the filenames: # display the files and directories that are in the current directory printf "%s\n" * # display only the directories in the current directory printf "%s\n" */ # display only...

The following will list up to ten of the most recently modified files in the current directory, using a long listing format (-l) and sorted by time (-t). ls -lt | head