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The ECMAScript formerly known as 6
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Kerrick Long
July 31, 2015
Programming
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1.3k
The ECMAScript formerly known as 6
Kerrick Long
July 31, 2015
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The ECMAScript formerly known as 6
KerrickLong Kerrick KerrickLong.com
JS
JS
DOM ECMAScript +
DOM
context.drawImage(new Image(), 0, 0) event.dataTransfer.setData(mime, data) new Worker('thread.js').postMessage(str) navigator.getUserMedia({audio: true})
DOM
DOM ECMAScript +
ECMAScript
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)
ECMAScript 6
ECMAScript 2015
JavaScript is growing up.
Dwindling use of App Frameworks that compile to JS
Dwindling use of App Frameworks that compile to JS
Dwindling use of Other Languages that compile to JS
Dwindling use of Other Languages that compile to JS
What’s new?
Modules
// app/routes/example.js import Ember from 'ember'; export default Ember.Route.extend();
Modules
// app/utils/func.js export var flatten = _.flatten.bind(_); export var union
= _.union.bind(_); Modules
// app/utils/func.js export var flatten = _.flatten.bind(_); export var union
= _.union.bind(_); export default { flatten: flatten, union: union }; Modules
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])); } });
Arrow Functions
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) }); });
Arrow Functions var _this = this; return this.store.find('pages').then(pages => {
return pages.map((pages, i) => { return _this.modelFor('posts').objectAt(i) }); });
Arrow Functions return this.store.find('pages').then(pages => { return pages.map((pages, i)
=> { return this.modelFor('posts').objectAt(i) }); });
Arrow Functions return this.store.find('pages').then(pages => { return pages.map((pages, i)
=> this.modelFor('posts').objectAt(i)); });
Enhanced Object Literals
var foo = 'bar'; var obj = { foo: foo,
model: function(params) { return params; } }; obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals
var foo = 'bar'; var obj = { foo, model:
function(params) { return params; } }; obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals
var foo = 'bar'; var obj = { foo, model(params)
{ return params; } }; obj['id_' + Math.random()] = 'secret'; Enhanced Object Literals
var foo = 'bar'; var obj = { foo, model(params)
{ return params; }, ['id_' + Math.random()]: 'secret' }; Enhanced Object Literals
Destructuring
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
import Ember from 'ember'; var { Route: Route }
= Ember; var [filename, ext] = 'photo.jpg'.split('.'); export default Route.extend(); Destructuring
import Ember from 'ember'; var { Route } =
Ember; var [filename, ext] = 'photo.jpg'.split('.'); export default Route.extend(); Destructuring
Template Strings
confirm('Really delete ' + promotion.name + '?'); Template Strings
confirm(`Really delete ${promotion.name}?`); Template Strings
const code = '<script src="' + src + '">\n' +
'</script>\n' + '<noscript>\n' + '<a href="' + link + '">View</a>\n' + '</noscript>'; Template Strings
const code = `<script src="${src}"> </script> <noscript> <a href="${link}">View</a> </noscript>`;
Template Strings
const and let
function example(isGood) { if (isGood) { var x = 4;
console.log(x); // 4 } console.log(x); // 4 } const and let
function example(isGood) { if (isGood) { const x = 4;
console.log(x); // 4 } console.log(x); // undefined } const and let
function canTransition(isSaving) { const canTransition = true; if (isSaving) {
canTransition = false; // Error: already set. } return canTransition; } const and let
function canTransition(isSaving) { let canTransition = true; if (isSaving) {
canTransition = false; } return canTransition; } const and let
Promises
Promise States Pending Fulfilled Rejected } Settled
getJSON onFulfilled onRejected getJSON onFulfilled onRejected
$.ajax(config) .then(onFulfilled, onRejected) Lies, all LIES!
var promise = getJSON('/comments'); somethingElse(); promise.then(onFulfilled, onRejected); Promise.prototype.then
JavaScript Promises Thinking Sync in an Async World then
JS