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babeljs.io/repl

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The ECMAScript formerly known as 6

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KerrickLong Kerrick KerrickLong.com

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JS

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JS

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DOM ECMAScript +

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DOM

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context.drawImage(new Image(), 0, 0) event.dataTransfer.setData(mime, data) new Worker('thread.js').postMessage(str) navigator.getUserMedia({audio: true}) DOM

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DOM ECMAScript +

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ECMAScript

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ECMAScript for (var i; i < 10; i++) { break; } (function(x) { return x + 1; })(100) var bareObject = Object.create(null) [1, 2, 3, 4].map(double).reduce(add)

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ECMAScript 6

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ECMAScript 2015

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JavaScript is growing up.

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Dwindling use of App Frameworks that compile to JS

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Dwindling use of App Frameworks that compile to JS

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Dwindling use of Other Languages that compile to JS

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Dwindling use of Other Languages that compile to JS

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What’s new?

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Modules

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// app/routes/example.js
 import Ember from 'ember';
 
 export default Ember.Route.extend(); Modules

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// app/utils/func.js
 export var flatten = _.flatten.bind(_);
 export var union = _.union.bind(_); Modules

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// app/utils/func.js
 export var flatten = _.flatten.bind(_);
 export var union = _.union.bind(_);
 
 export default {
 flatten: flatten,
 union: union
 }; Modules

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Modules import Ember from 'ember';
 import { flatten, union } from 'app/utils/func';
 
 export default Ember.Route.extend({
 model: function() {
 return flatten(union([1, 2, 3]));
 }
 });

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Arrow Functions

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Arrow Functions var _this = this;
 return this.store.find('pages').then(function(pages) {
 return pages.map(function(pages, i) {
 return _this.modelFor('posts').objectAt(i)
 });
 });

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Arrow Functions var _this = this;
 return this.store.find('pages').then(pages => {
 return pages.map((pages, i) => {
 return _this.modelFor('posts').objectAt(i)
 });
 });

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Arrow Functions 
 return this.store.find('pages').then(pages => {
 return pages.map((pages, i) => {
 return this.modelFor('posts').objectAt(i)
 });
 });

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Arrow Functions 
 return this.store.find('pages').then(pages => {
 return pages.map((pages, i) => this.modelFor('posts').objectAt(i));
 });

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Enhanced Object Literals

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var foo = 'bar';
 var obj = {
 foo: foo,
 model: function(params) {
 return params;
 }
 };
 obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals

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var foo = 'bar';
 var obj = {
 foo,
 model: function(params) {
 return params;
 }
 };
 obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals

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var foo = 'bar';
 var obj = {
 foo,
 model(params) {
 return params;
 }
 };
 obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals

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var foo = 'bar';
 var obj = {
 foo,
 model(params) {
 return params;
 }, ['id_' + Math.random()]: 'secret'
 }; Enhanced Object Literals

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Destructuring

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import Ember from 'ember';
 
 var Route = Ember.Route;
 var filename = ‘photo.jpg’.split(‘.')[0]; var ext = ‘photo.jpg’.split('.')[1]; 
 export default Route.extend(); Destructuring

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import Ember from 'ember';
 
 var { Route: Route } = Ember;
 var [filename, ext] = 'photo.jpg'.split('.'); 
 export default Route.extend(); Destructuring

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import Ember from 'ember';
 
 var { Route } = Ember;
 var [filename, ext] = 'photo.jpg'.split('.'); 
 export default Route.extend(); Destructuring

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Template Strings

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confirm('Really delete ' + promotion.name + '?'); Template Strings

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confirm(`Really delete ${promotion.name}?`); Template Strings

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const code = '\n' +
 '\n' +
 '\n' +
 'View\n' +
 ''; Template Strings

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const code = `
 
 
 View
 `; Template Strings

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const and let

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function example(isGood) {
 if (isGood) {
 var x = 4;
 console.log(x); // 4
 }
 console.log(x); // 4
 } const and let

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function example(isGood) {
 if (isGood) {
 const x = 4;
 console.log(x); // 4
 }
 console.log(x); // undefined
 } const and let

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function canTransition(isSaving) {
 const canTransition = true;
 if (isSaving) {
 canTransition = false; // Error: already set.
 }
 return canTransition;
 } const and let

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function canTransition(isSaving) {
 let canTransition = true;
 if (isSaving) {
 canTransition = false;
 }
 return canTransition;
 } const and let

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Promises

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Promise States Pending Fulfilled Rejected } Settled

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getJSON onFulfilled onRejected getJSON onFulfilled onRejected

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$.ajax(config) .then(onFulfilled, onRejected) Lies, all LIES!

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var promise = getJSON('/comments'); somethingElse(); promise.then(onFulfilled, onRejected); Promise.prototype.then

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JavaScript Promises Thinking Sync in an Async World then

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JS