TypeScript is a language for application-scale JavaScript development. TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Any browser. Any host. Any OS. Open Source.

1. 01/2014

2. Agenda
What is TypeScript.
Language Features.
Integration in Environnement.
Future.
2

3. What is TypeScript
Why create TypeScript
CoffeScript, Dart, TypeScript…
Transcripting.
3

4. What is TypeScript/Why create TypeScript
• TypeScript is just a tool to be used at coding-time
to improve the quality of your JavaScript
• TypeScript is designed for development of large
applications and compiles down to JavaScript
• Adds optional static typing and class-based
POO to the language
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5. What is TypeScript/CoffeScript, Dart, TypeScript
• CoffeeScript – a fresh coat of paint
• Dart – a fresh look at the web
• TypeScript – the JavaScript of tomorrow
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6. What is TypeScript/Transcripting
• In reality is not a compilation but a transcripting
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7. Language Features
Primitive Type
Grammar
Generics
Poo
Parametres
Exception
Include / Reference
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8. Language Features / Primitive Type
•
•
•
•
•
•
•
•
Number
Boolean
String
Void
Null
Undefined
Enum
String Literal
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9. Language Features / Grammar
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10. Language Features / Grammar
var myString = 'A String';
var myNumber = 1;
var myBoolean = true;
var myString: string = 'A String';
var myNumber: number = 1;
var myBoolean: boolean = true;
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11. Language Features / Grammar
var example = {
name: 'Example',
id: 5,
collection: ['a', 'b', 'c']
}
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12. Language Features / Grammar
var example: {
name: string;
id: number;
collection: string[];
} = {
name: 'Example',
id: 5,
collection: ['a', 'b', 'c']
}
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13. POO / Items
Classes
Interfaces
Function
Modules
Generic
13

14. Classes
class Car {
// Property (public by default)
engine: string;
// Constructor
// (accepts a value so you can
// initialize engine)
constructor(engine: string) {
this.engine = engine;
}
}
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15. Interface
interface ICar {
engine: string;
color: string;
}
class Car implements ICar {
constructor(
public engine: string,
public color: string) {
}
}
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16. Function
class Car {
engine: string;
constructor(engine: string) {
this.engine = engine;
}
start() {
return "Started " +
this.engine;
}
}
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17. Generics
class G<T> { // parameter T
self: G<T>; // T type argument
f() {
// Both of type G<T>
this.self = this;
}
}
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18. Module
module Shapes {
export class Rectangle {
constructor(
public height: number,
public width: number) {
}
}
}
// This works!
var rect = Shapes.Rectangle(10, 4);
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19. Module
// bootstrapper.ts file
// imports the greeter.ts file as the
greeter module
import gt = module('greeter');
export function run() {
var el =
document.getElementById('content');
var greeter = new gt.Greeter(el);
greeter.start();
}
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20. POO / Keyword
•
•
•
•
•
•
Public
Private
Interface
Class
Implements
Module
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21. POO/ Function overload
function func(shape: Square): number;
function func(shape: Ellipse): number;
function func(shape: Triangle): number;
function func(shape: Shape): number {
if (shape instanceof Square) {
// Do something
}
// ...
throw new TypeError("Unsupported
type!");
}
21

22. Language Features / Parameter
print(char: string = '0') {
}
print4(index: number = this.length): number {
}
print2(char?: string) {
}
print3(...num: number[]) {
}
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23. Language Features / Exception
• TypeScript using the throw keyword. In
JavaScript you can follow the throw statement
with any type, although typically strings are
used to supply an error message. In TypeScript
it is more usual to throw an “Error” object.
• Only on catch for multiple object Exception
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24. Language Features / References
/// <reference path="SimplSocket.ts" />
module MyWebApp.BusinessLogic {
class ComplexWebSocket extends
MyWebApp.BusinessLogic.SimplSocket
{
}
}
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25. Integration in Environnement
Editor
Web Essentials
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26. Environnement / Editor
• Visual studio, WebStorm with IntelliSense and
Debug.
• Sublime Text 2, Vim and eMacs, but it does
not include the TLS, so there is no IntelliSense
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27. Environnement / Web Essentials
• Produce a minified version of the generated
JavaScript file.
• Will automatically produce source map
(.js.map) files for debugging purposes as soon
as the .ts file is saved.
• …
27

28. Future
• 0.9.5
– Focus on user-report issues, Improve reliability,
Improve CPU- and memory-usage
• 1.0RC
– Finish stability work, Finish conformance with 1.0
spec
• 1.0
– Begin backward-compatibility
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29. Future
• 1.x
– Async/Await
– Mixins
– Protected access
– More ECMAScript 6 language features
– ECMAScript 6 modules syntax
– ES6-compatible codegen
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30. Questions?
30

31. Some links…
http://www.typescriptlang.org/
http://typescript.io/
http://en.wikipedia.org/wiki/TypeScript
http://www.dotnetcurry.com/showarticle.aspx?ID=939
http://www.johnpapa.net/typescriptpost2/
http://www.codeproject.com/Articles/469280/An-introduction-to-Type-Script
http://codeforhire.com/2013/06/18/coffeescript-vs-typescript-vs-dart/
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32. Some books…
32

33. Find out more
• On https://techblog.betclicgroup.com/

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