TypeScript Introduction

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var inx: number = 1, text: string = “Lorem”, isReady: bool = false, arr: string[], obj: ObjInterface = factory.getObj(), mixedVal: any;

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var obj: { x: number, y: number }, fn: ( x: number, y?: any ) => number, constr: new() => ObjInterface;

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var treatItems = function( arr, callback ) { // do something return arr; };

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var treatItems = function( arr: string[], callback: (value: string, inx: number, arr: string[]) => string[]) { // do something return arr; };

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var treatItems = function( arr, callback ) { // do something return arr; };

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class Mamal { private nickname: string; constructor( nickname: string = "Noname" ) { this.nickname = nickname; } public getNickname():string { return this.nickname; } }

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class Cat extends Mamal { private family: string = "Felidae"; constructor( nickname: string ) { super( nickname ); } public getFamily():string { return this.family; } }

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// Generated JavaScript: helper var __extends = this.__extends || function (d, b) { function __() { this.constructor = d; } __.prototype = b.prototype; d.prototype = new __(); }

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// Generated JavaScript: classes var Mamal = (function () { … })(); var Cat = (function (_super) { __extends(Cat, _super); function Cat(nickname) { _super.call(this, nickname); this.family = "Felidae"; } Cat.prototype.getFamily = function () { return this.family; }; return Cat; })(Mamal);

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interface Point { x: number; y: number; } function getDistance( pointA: Point, pointB: Point ) { return Math.sqrt( Math.pow( pointB.x - pointA.x, 2 ) + Math.pow( pointB.y - pointA.y, 2 ) ); } var result = getDistance( { x: - 2, y: - 3 }, { x: - 4, y: 4 })

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interface Mover { move(): void; } interface Shaker { shake(): void; } interface MoverShaker extends Mover, Shaker { }

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module graphic { export class Point { x: number; y: number; constructor( x: number = 0, y: number = 0 ) { }; } } var point = new graphic.Point( 10, 10 );

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// File main.ts: import log = module ( "log” ); log.message( "hello" ); // File log.js: export function message(s: string) { console.log(s); }

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(x) => { return Math.sin(x); } (x) => Math.sin(x); x => { return Math.sin(x); } x => Math.sin(x);

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var messenger = { message: "Hello World", start: function() { setTimeout( () => { alert( this.message ); }, 3000 ); } }; messenger.start();

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class Shape { ... } class Circle extends Shape { ... } function createShape( kind: string ): Shape { if ( kind === "circle" ) return new Circle(); ... } var circle = createShape( "circle" );

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interface JQuery { text(content: string); } interface JQueryStatic { get(url: string, callback: (data: string) => any); (query: string): JQuery; } declare var $: JQueryStatic;

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/// module Parallax { export class ParallaxContainer { private content: HTMLElement; constructor( scrollableContent: HTMLElement ) { $( scrollableContent ).scroll(( event: JQueryEventObject ) => { this.onContainerScroll( event ); }); } private onContainerScroll( e: JQueryEventObject ) : void { // do something } }