Tutorial by Examples: begin

IF you are using simple categories, with each physics body belonging to only one category, then this alternative form of didBeginContact may be more readable: func didBeginContact(contact: SKPhysicsContact) { let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask ...

Debugging by raising exceptions is far easier than squinting through print log statements, and for most bugs, its generally much faster than opening up an irb debugger like pry or byebug. Those tools should not be your first step. Debugging Ruby/Rails Quickly: 1. Fast Method: Raise an Exceptio...

BEGINS - returns TRUE if one string begins with another string. string1 BEGINS string2 If string1 BEGINS with (or is equal to) string2 this will return true. Otherwise it will return false. If string two is empty ("") it will always return true. BEGINS is very useful in queries wher...

First create a disposable class: public class MyDisposableHelper: IDisposable { private bool _disposed; private readonly ViewContext _viewContext; public MyDisposableHelper(ViewContext viewContext) { if (viewContext == null) { throw ne...

// PHYSICS CONSTANTS struct PhysicsCategory { static let None : UInt32 = 0 static let All : UInt32 = UInt32.max static let player : UInt32 = 0b1 // 1 static let bullet : UInt32 = 0b10 // 2 } var nodesToRemove = [SKNode]() /...

This one-liner illustrates some of the basic series operations. Before analysing, we'll initiate a block to be manipulated: stuff: [chair lamp table book carpet] Now our one-liner: head insert stuff take back tail stuff There are five operations within this example, and with each of them it...

Turbolinks provides an event listener that can be used to stop visits from occurring. Listen to the turbolinks:before-visit event to be notified when a visit is about to commence. In the event handler, you can use: // pure javascript event.data.url or // jQuery $event.originalEvent.data.url...

public enum BookCode { _10A("Simon Haykin", "Communication System"), _42B("Stefan Hakins", "A Brief History of Time"), E1("Sedra Smith", "Electronics Circuits"); private String author; private String title; ...

Require is a statement that Node interprets as, in some sense, a getter function. For example, say you have a file named analysis.js, and the inside of your file looks like this, function analyzeWeather(weather_data) { console.log('Weather information for ' + weather_data.time + ': '); consol...

Node's require is also very helpful when used in tandem with an NPM package. Say, for example, you would like to use the NPM package require in a file named getWeather.js. After NPM installing your package through your command line (git install request), you are ready to use it. Your getWeather.js f...