Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
The ECMAScript formerly known as 6
Search
Kerrick Long
July 31, 2015
Programming
0
1.3k
The ECMAScript formerly known as 6
Kerrick Long
July 31, 2015
Tweet
Share
More Decks by Kerrick Long
See All by Kerrick Long
15 Things You Shouldn't Do In Ember Anymore
kerrick
0
1.1k
CSS Study Group 1
kerrick
0
1.3k
CSS Study Group 2
kerrick
1
1.1k
Services & Component Collaboration
kerrick
0
770
Donate STL #Build4STL Hackathon Keynote
kerrick
0
370
Donate STL
kerrick
0
810
TDD With Ember.js
kerrick
0
1.1k
JavaScript Promises - Thinking Sync in an Async World
kerrick
20
7.9k
Other Decks in Programming
See All in Programming
Azure SRE Agentで運用は楽になるのか?
kkamegawa
0
2.4k
知っているようで知らない"rails new"の世界 / The World of "rails new" You Think You Know but Don't
luccafort
PRO
1
180
Compose Multiplatform × AI で作る、次世代アプリ開発支援ツールの設計と実装
thagikura
0
170
How Android Uses Data Structures Behind The Scenes
l2hyunwoo
0
480
testingを眺める
matumoto
1
140
ProxyによるWindow間RPC機構の構築
syumai
3
1.2k
go test -json そして testing.T.Attr / Kyoto.go #63
utgwkk
3
310
デザイナーが Androidエンジニアに 挑戦してみた
874wokiite
0
540
Processing Gem ベースの、2D レトロゲームエンジンの開発
tokujiros
2
130
プロポーザル駆動学習 / Proposal-Driven Learning
mackey0225
2
1.3k
GitHubとGitLabとAWS CodePipelineでCI/CDを組み比べてみた
satoshi256kbyte
4
240
Swift Updates - Learn Languages 2025
koher
2
490
Featured
See All Featured
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
KATA
mclloyd
32
14k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.9k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3k
A Modern Web Designer's Workflow
chriscoyier
696
190k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
Designing for humans not robots
tammielis
253
25k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.5k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
850
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Transcript
babeljs.io/repl
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