ECMAScript 6 - part 1

Transcript

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   ecmascript 6 today! www.sayan.ee Sunday, 12 May, 13

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   Sunday, 12 May, 13

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   1995 birth Sunday, 12 May, 13

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   1995 1999 birth standardised Sunday, 12 May, 13

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   1995 1999 2005 birth standardised es3 js1.5 Sunday, 12 May,

   13
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   1995 1999 2005 2013 birth standardised es3 js1.5 es6 js2.0

   harmony Sunday, 12 May, 13
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   es6 modules block scoping generators proxies binary data string templates

   destructuring rest args name objects hash table weak maps comprehension classes Sunday, 12 May, 13
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   es6 modules block scoping destructuring classes google traceur features use

   today! Sunday, 12 May, 13
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   block scoping - let now var jsFuture = "es6"; (function

   () { if (!jsFuture) { var jsFuture = "es5"; } console.log(jsFuture); }()); es6 Sunday, 12 May, 13
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    block scoping - let now var jsFuture = "es6"; (function

    () { if (!jsFuture) { var jsFuture = "es5"; } console.log(jsFuture); }()); // var jsFuture; // jsFuture = es5 es6 Sunday, 12 May, 13
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    var jsFuture = "es6"; (function () { if (!jsFuture) {

    let jsFuture = "es5"; } console.log(jsFuture); // jsFuture = es6 }()); block scoping - let now var jsFuture = "es6"; (function () { if (!jsFuture) { var jsFuture = "es5"; } console.log(jsFuture); }()); // var jsFuture; // jsFuture = es5 es6 variables are block scoped Sunday, 12 May, 13
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    block scoping - const now var LATEST_IE = 11; LATEST_IE

    = 6; console.log( 'I now have IE' + LATEST_IE); Sunday, 12 May, 13
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    block scoping - const now var LATEST_IE = 11; LATEST_IE

    = 6; console.log( 'I now have IE' + LATEST_IE); es6 const LATEST_IE = 11; LATEST_IE = 6; console.log( 'I now have IE' + LATEST_IE); variables are read-only Sunday, 12 May, 13
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    classes now es6 var Language = function(config) { this.name =

    config.name; this.founder = config.founder; this.year = config.year; }; Language.prototype.summary = function() { return this.name + " was created by " + this.founder + " in " + this.year; }; // extending Language? Sunday, 12 May, 13
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    classes now es6 google traceur var Language = function(config) {

    this.name = config.name; this.founder = config.founder; this.year = config.year; }; Language.prototype.summary = function() { return this.name + " was created by " + this.founder + " in " + this.year; }; // extending Language? class Language { constructor(name, founder, year) { this.name = name; this.founder = founder; this.year = year; } summary() { return this.name + " was created by " + this.founder + " in " + this.year; } } class MetaLanguage extends Language { constructor(x, y, z, version) { super(x, y, z); this.version = version; } } extendable code Sunday, 12 May, 13
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    modules now es6 google traceur var circle = (function() {

    "use strict"; var pi = 3.141; function area(radius) { return "Area of Circle with radius " + radius + " is " + (pi * radius * radius); } function circumference(radius) { return "Circumference of Circle with radius " + radius + " is " + (2 * pi * radius); } return Object.preventExtensions(Object.create(null, { pi: { get: function() { return pi; }, enumerable: true }, area: { get: function() { return area; }, enumerable: true }, circumference: { get: function() { return circumference; }, enumerable: true } })); }).call(this); module circle { export var pi = 3.141; export function area(radius) { return "Area of Circle with radius " + radius + " is " + (pi * radius * radius); } export function circumference(radius) { return "Circumference of Circle with radius " + radius + " is " + (2 * pi * radius); } } console.log( circle.area(3) ); console.log( circle.circumference(2) ); classes can be instantiated as objects while modules cannot Sunday, 12 May, 13
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    // Variable Swapping var a = 'Brisbane', b = 'Singapore',

    temp; temp = b; b = a; a = temp; // Multiple-Variable returns function jsEngines() { return ['V8', 'SpiderMonkey', 'Trident']; } var chrome = jsEngines()[0], firefox = jsEngine()[1], ie = jsEngine()[2]; destructuring now Sunday, 12 May, 13
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    // Variable Swapping var a = 'Brisbane', b = 'Singapore',

    temp; temp = b; b = a; a = temp; // Multiple-Variable returns function jsEngines() { return ['V8', 'SpiderMonkey', 'Trident']; } var chrome = jsEngines()[0], firefox = jsEngine()[1], ie = jsEngine()[2]; destructuring now es6 google traceur // Variable Swapping var [a, b] = ['Brisbane', 'Singapore']; console.log('I bought plane ticket ' + a + '-' + b + ' for CampJS'); [a,b] = [b,a]; console.log('oops!! I meant, I bought plane ticket ' + a + '-' + b + ' for CampJS'); // Multiple-Variable returns function jsEngines() { return ['V8', 'SpiderMonkey', 'Trident']; } var [chrome, firefox, ie] = jsEngines(); Sunday, 12 May, 13
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    compatibility table firefox chrome Sunday, 12 May, 13

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    online repl Sunday, 12 May, 13

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    standards documentation Sunday, 12 May, 13

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    other resources Sunday, 12 May, 13

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    Sunday, 12 May, 13