Tutorial by Examples: sin

Accessing indices safely

By adding the following extension to array indices can be accessed without knowing if the index is inside bounds. extension Array { subscript (safe index: Int) -> Element? { return indices ~= index ? self[index] : nil } } example: if let thirdValue = array[safe: 2] { ...

Swift Language • Arrays

Listener Events Using Labels

Labeling the alternatives inside a rule starting with the # operator tells ANTLR to generate listener methods for each label corresponding to the alternative. By specifying a label for each alternative in the following rule: // Rule type : int #typeInt | short #typeShort | long ...

ANTLR • Listeners

Concatenate an array of strings into a single string

The System.String.Join method allows to concatenate all elements in a string array, using a specified separator between each element: string[] words = {"One", "Two", "Three", "Four"}; string singleString = String.Join(",", words); // singleString =...

C# Language • Common String Operations

Decide if your device is static or not, using the accelerometer

Add the following code to the onCreate()/onResume() method: SensorManager sensorManager; Sensor mAccelerometer; final float movementThreshold = 0.5f; // You may have to change this value. boolean isMoving = false; float[] prevValues = {1.0f, 1.0f, 1.0f}; float[] currValues = new float[3]; ...

Android • SensorManager

View And Add Shortcuts in Android Studio

By going to Settings >> Keymap A window will popup showing All the Editor Actions with the their name and shortcuts. Some of the Editor Actions do not have shortcuts. So right click on that and add a new shortcut to that. Check the image below

Android • Android Studio

Upload an image or a video to S3 using AWS SDK

Before starting with the example I'd recommend to create a Singleton with a delegate class member so you could achieve a use case of uploading a file in the background and let the user keep using your app while the files are being uploaded even when the app is the background. Let's start, first, we...

iOS • AWS SDK

Wrap simple value into a promise using $q.when()

If all you need is to wrap the value into a promise, you don't need to use the long syntax like here: //OVERLY VERBOSE var defer; defer = $q.defer(); defer.resolve(['one', 'two']); return defer.promise; In this case you can just write: //BETTER return $q.when(['one', 'two']); $q.when ...

AngularJS • Angular promises with $q service

Memory management rules when using manual reference counting.

These rules apply only if you use manual reference counting! You own any object you create By calling a method whose name begins with alloc, new, copy or mutableCopy. For example: NSObject *object1 = [[NSObject alloc] init]; NSObject *object2 = [NSObject new]; NSObject *object3 = [object2 ...

Objective-C Language • Memory Management

Sending HTML Email Using mail()

<?php $to = '[email protected]'; $subject = 'Sending an HTML email using mail() in PHP'; $message = '<html><body>This paragraph is bold.This text is italic.</body></html>'; $headers =...

PHP • Sending Email

Using different (local) Nuget package sources using UI

It is common for company to set up it's own nuget server for distribution of packages across different teams. Go to Solution Explorer and click Right Mouse button then choose Manage NuGet Packages for Solution In window that opens click on Settings Click on + in top right corner the...

.NET Framework • NuGet packaging system

A process committing suicide using kill()

A process can (try to) send a signal to any other process using the kill() function. To do so, the sending process needs to known the receiving process' PID. As, without introducing a race, a process can only be sure of its own PID (and the PIDs of its children) the most simple example to demonstra...

POSIX • Signals

Using SelectMany instead of nested loops

Given 2 lists var list1 = new List<string> { "a", "b", "c" }; var list2 = new List<string> { "1", "2", "3", "4" }; if you want to output all permutations you could use nested loops like var result = new List<s...

C# Language • LINQ Queries

Dependency Injection using Ninject

The following example shows how to set up Dependency Injection using Ninject as an IoC container. First add a CustomModule class to your WebJob project, and add any dependency bindings there. public class CustomModule : NinjectModule { public override void Load() { Bind<IMyI...

azure-webjobs • Azure Webjobs SDK

Operations in Colour

Consider the following example: @sky-blue: #87ceeb; @dark-sky-blue: @sky-blue + #333; body { background-color: @dark-sky-blue; } The above example gives you: body { background-color: #baffff; } Here it explains how to declare a variable and also make operations on a particular va...

less • Variables

Dataframe into nested JSON as in flare.js files used in D3.js

def to_flare_json(df, filename): """Convert dataframe into nested JSON as in flare files used for D3.js""" flare = dict() d = {"name":"flare", "children": []} for index, row in df.iterrows(): parent = row[...

pandas • JSON

Recursive Lambda using assigned variable

One method for creating recursive lambda functions involves assigning the function to a variable and then referencing that variable within the function itself. A common example of this is the recursive calculation of the factorial of a number - such as shown in the following code: lambda_factorial ...

Python Language • Functions

Sounds using SoundEffect

In order to play a sound using the SoundEffect type, create a variable to hold the loaded sound. Typically this would be an instance variable in the Game class: private SoundEffect mySound; Then, in the LoadContent() method of the Game class: protected override void LoadContent() { // l...

monogame • Playing Sounds

Sending Plain Text Email Using PHPMailer

Basic Text Email <?php $mail = new PHPMailer(); $mail->From = "[email protected]"; $mail->FromName = "Full Name"; $mail->addReplyTo("[email protected]", "Reply Address"); $mail->Subject = "Subject Text"; $mail->Body ...

PHP • Sending Email

Sending Email With An Attachment Using mail()

<?php $to = '[email protected]'; $subject = 'Email Subject'; $message = 'This is the email message body'; $attachment = '/path/to/your/file.pdf'; $content = file_get_contents($attachment); /* Attachment content transferred in Base64 encoding MUST be split into chunk...

PHP • Sending Email

Sending HTML Email Using PHPMailer

<?php $mail = new PHPMailer(); $mail->From = "[email protected]"; $mail->FromName = "Full Name"; $mail->addReplyTo("[email protected]", "Reply Address"); $mail->addAddress("[email protected]", "Recepient Name&quot...

PHP • Sending Email