Tutorial by Examples: st

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...

const myArr = ['one', 'two', 'three'] const [ a, b, c ] = myArr // a = 'one', b = 'two, c = 'three' We can set default value in destructuring array, see the example of Default Value While Destructuring. With destructuring array, we can swap the values of 2 variables easily: var a = 1; var ...

Destructuring is a convenient way to extract properties from objects into variables. Basic syntax: let person = { name: 'Bob', age: 25 }; let { name, age } = person; // Is equivalent to let name = person.name; // 'Bob' let age = person.age; // 25 Destructuring and renaming: le...

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...

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

This guide assumes you already have Ruby installed. If you're using Ruby < 1.9 you'll have to manually install RubyGems as it won't be included natively. To install a ruby gem, enter the command: gem install [gemname] If you are working on a project with a list of gem dependencies, then the...

The random number generator can (and should) be used for multiple distributions. #include <iostream> #include <random> int main() { std::default_random_engine pseudo_random_generator; std::uniform_int_distribution<int> int_distribution(0, 9); std::uniform_real_dis...

The strchr and strrchr functions find a character in a string, that is in a NUL-terminated character array. strchr return a pointer to the first occurrence and strrchr to the last one. #include <stdio.h> #include <stdlib.h> #include <string.h> int main(void) { char toSe...

The default position of an element is static. To quote MDN: This keyword lets the element use the normal behavior, that is it is laid out in its current position in the flow. The top, right, bottom, left and z-index properties do not apply. .element{ position:static; }

In this example we use the constructor to declare a public property position and a protected property speed in the base class. These properties are called Parameter properties. They let us declare a constructor parameter and a member in one place. One of the best things in TypeScript, is automatic ...

To implement an item click listener and/or an item long click listener, you can create an interface in your adapter: public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> { public interface OnItemClickListener { void onItemSeleted(int position, Vi...

countMatches method from org.apache.commons.lang3.StringUtils is typically used to count occurences of a substring or character in a String: import org.apache.commons.lang3.StringUtils; String text = "One fish, two fish, red fish, blue fish"; // count occurrences of a substring Str...

HTML <p>My shadow always follows me.</p> CSS p { -webkit-filter: drop-shadow(10px 10px 1px green); filter: drop-shadow(10px 10px 1px green); } Result

C# allows user-defined types to control assignment and casting through the use of the explicit and implicit keywords. The signature of the method takes the form: public static <implicit/explicit> operator <ResultingType>(<SourceType> myType) The method cannot take any more argu...

Start ADB: adb kill-server Stop ADB: adb start-server

'if only one area (not multiple areas): With Range("A3:D20") Debug.Print .Cells(.Cells.CountLarge).Row Debug.Print .Item(.Cells.CountLarge).Row 'using .item is also possible End With 'Debug prints: 20 'with multiple areas (also works if only one area): Dim rngArea As Range,...

In Python 3.x all classes are new-style classes; when defining a new class python implicitly makes it inherit from object. As such, specifying object in a class definition is a completely optional: Python 3.x3.0 class X: pass class Y(object): pass Both of these classes now contain object in ...

CSS can be applied in multiple places: inline (Node.setStyle) in a stylesheet to a Scene as user agent stylesheet (not demonstrated here) as "normal" stylesheet for the Scene to a Node This allows to change styleable properties of Nodes. The following example demonst...