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 future of JavaScript
Search
dherman
September 27, 2011
Programming
6
2.4k
The future of JavaScript
I've seen the future of JavaScript, and it's AMAZING
dherman
September 27, 2011
Tweet
Share
More Decks by dherman
See All by dherman
Rust + Node = Neon
dherman
1
310
Evolving the World's Most Popular Programming Language
dherman
0
630
Closing iterators
dherman
0
730
A better future for comprehensions
dherman
0
1.9k
Evolution is Awesome
dherman
0
510
Status Report: ES6 Modules
dherman
16
3.9k
Discussion with TC39 about the semantics of symbols
dherman
1
370
September 2013 Modules Status Update
dherman
2
1.2k
Rust: low-level programming without the segfaults
dherman
13
8.9k
Other Decks in Programming
See All in Programming
創造的活動から切り拓く新たなキャリア 好きから始めてみる夜勤オペレーターからSREへの転身
yjszk
1
130
Amazon S3 NYJavaSIG 2024-12-12
sullis
0
100
今年のアップデートで振り返るCDKセキュリティのシフトレフト/2024-cdk-security-shift-left
tomoki10
0
210
range over funcの使い道と非同期N+1リゾルバーの夢 / about a range over func
mackee
0
110
20年もののレガシープロダクトに 0からPHPStanを入れるまで / phpcon2024
hirobe1999
0
500
103 Early Hints
sugi_0000
1
230
Exploring: Partial and Independent Composables
blackbracken
0
100
Haze - Real time background blurring
chrisbanes
1
520
Effective Signals in Angular 19+: Rules and Helpers @ngbe2024
manfredsteyer
PRO
0
140
フロントエンドのディレクトリ構成どうしてる? Feature-Sliced Design 導入体験談
osakatechlab
8
4.1k
情報漏洩させないための設計
kubotak
3
340
From Translations to Multi Dimension Entities
alexanderschranz
2
130
Featured
See All Featured
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
28
4.4k
Product Roadmaps are Hard
iamctodd
PRO
49
11k
Statistics for Hackers
jakevdp
796
220k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
280
13k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
330
21k
Done Done
chrislema
181
16k
Rails Girls Zürich Keynote
gr2m
94
13k
Code Review Best Practice
trishagee
65
17k
Fashionably flexible responsive web design (full day workshop)
malarkey
405
66k
The Cost Of JavaScript in 2023
addyosmani
45
7k
Unsuck your backbone
ammeep
669
57k
Transcript
I HAVE SEEN THE FUTURE OF JAVASCRIPT AND IT’S AMAZING
Hi, I’m dherman @littlecalculist
I — JavaScript and I love the language it almost
is...
None
None
POWER
Bits, bytes and blobs binary file and network I/O
var Point2D = new StructType({ x: uint32,
y: uint32 }); var Color = new StructType({ r: uint8, g: uint8, b: uint8 });
var Pixel = new StructType({ point: Point2D,
color: Color }); var Triangle = new ArrayType(Pixel, 3);
new Triangle([ { point: { x: 0,
y: 0 }, color: { r: 255, g: 255, b: 255 } }, { point: { x: 5, y: 5 }, color: { r: 128, g: 0, b: 0 } }, { point: { x: 10, y: 0 }, color: { r: 0, g: 0, b: 128 } } ])
Keep off my property private names
function Container() { var secret = 3;
this.service = function() { if (secret-‐-‐) { ... } }; }
var key = Name.create("secret"); function Container() { this[key] = 3
} Container.prototype = { service: function() { if (this[key]-‐-‐) { ... } } };
var markers = new WeakMap(); var tile = new Tile(...);
var results = [...]; tiles.set(tile, results);
var obj = Proxy.create({ get: function(...) {
... }, set: function(...) { ... }, delete: function(...) { ... }, ... }, proto);
Callbacks: the new goto? (well, no, but... still.)
Pour 1/2 cup water into pan. When you’re done: Bring
water to boil. When that’s done: Lower heat and add rice. After 15 minutes: Turn off heat and serve.
pan.pourWater(function() { range.bringToBoil(function() {
range.lowerHeat(function() { pan.addRice(function() { setTimeout(function() { range.turnOff(); serve(); }, 15 * 60 * 1000); }); }); }); });
pan.pourWater(function() { range.bringToBoil(function() {
range.lowerHeat(function() { pan.addRice(function() { setTimeout(function() { range.turnOff(); serve(); }, 15 * 60 * 1000); }); }); }); }); pyramid of doom
generators a.k.a. coroutines a.k.a. Interruptible functions
function* g() { yield 1;
yield 2; } var obj = g(); obj.next(); // 1 obj.next(); // 2
var task = new Task(function*() { var
text = yield XHR("file.txt"); yield timeout(1000); status.innerHTML = text; }); task.start();
Great languages deserve great libraries and that means modules
None
browser <script></script>
var Collections = (function() { function Dictionary()
{ ... } return { Dictionary: Dictionary }; })();
“The human compiler, at work.” — Paul Graham
module Collections { export function Dictionary() {
... } }
import { $ } from "jquery.js"; import { map, each
} from "underscore.js";
import { $ } from "jquery.js"; import { map, each
} from "underscore.js"; loaded once, before execution
Expressiveness artwork credit: sam flores
Death of a thousand cuts typeof null === "object" //
wtfjs? arguments isn’t an Array #$@?! var hoisting
function f(i, j, ...rest) { return rest.slice(i,
j); }
array.push(thing1, thing2, ...moarThings); var shape = new Shape(...points);
function img(src, width=320, height=240) { ... }
for (i = 0; i < a.length; i++) {
let x = a[i]; x.onclick = function() { x.toggle() }; }
for (i = 0; i < a.length; i++) {
let x = a[i]; x.onclick = function() { x.toggle() }; } block scoped
var { r, g, b } = thing.color; var [x,
y] = circle.center; [a, b] = [b, a];
var obj = { foo: "foo",
bar() { return this.foo }, [getName()]: 17 };
for (x in [3, 4, 5])
// 0, 1, 2 (d’oh) for (x of [3, 4, 5]) // 3, 4, 5 for (x of keys(o)) // keys in o for (x of values(o)) // values of o for ([k, v] of items(o)) // props of o
import iterate from "@iter"; obj[iterate] = function() {
return { next: function() { ... } } } for (x of obj) { ... }
[ x * y for (x of obj1) for (y
of obj2) ]
"<p>\nohai, " + firstName + " " + lastName +
"\n</p>"
`<p> ohai, ${firstName} ${lastName} </p>`
safeHTML`<p> ohai, ${firstName} ${lastName} </p>`
How soon is now?
We (Ecma) are working hard and fast on the spec.
We (vendors) will ship features before the spec is done. Transpilers as language shims: Traceur, Narcissus
None