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
JavaScript Beyond jQuery
Search
Evan Solomon
June 08, 2013
Technology
1
530
JavaScript Beyond jQuery
WordCamp Milwaukee
Evan Solomon
June 08, 2013
Tweet
Share
More Decks by Evan Solomon
See All by Evan Solomon
Demystifying the Black Box of WordPress Core
evansolomon
1
3.4k
WordCamp Las Vegas -- Make stuff that people want
evansolomon
2
2.9k
You Have No Idea What Your Users Want
evansolomon
1
520
You Don't Know People
evansolomon
2
850
Other Decks in Technology
See All in Technology
意志の力が9割。アニメから学ぶAI時代のこれから。
endohizumi
1
100
Google Agentspaceを実際に導入した効果と今後の展望
mixi_engineers
PRO
3
780
サイボウズフロントエンドの横断活動から考える AI時代にできること
mugi_uno
2
580
Oracle Exadata Database Service on Cloud@Customer X11M (ExaDB-C@C) サービス概要
oracle4engineer
PRO
2
6.4k
僕たちが「開発しやすさ」を求め 模索し続けたアーキテクチャ #アーキテクチャ勉強会_findy
bengo4com
0
2.5k
Foundation Model × VisionKit で実現するローカル OCR
sansantech
PRO
1
410
Amazon Bedrock AgentCoreのフロントエンドを探す旅 (Next.js編)
kmiya84377
1
160
プロダクトエンジニアリングで開発の楽しさを拡張する話
barometrica
0
210
自治体職員がガバクラの AWS 閉域ネットワークを理解するのにやって良かった個人検証環境
takeda_h
0
280
家族の思い出を形にする 〜 1秒動画の生成を支えるインフラアーキテクチャ
ojima_h
3
1.3k
コミュニティと計画的偶発性理論 - 出会いが人生を変える / Life-Changing Encounters
soudai
PRO
4
210
Amazon Qで2Dゲームを作成してみた
siromi
0
170
Featured
See All Featured
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1.1k
Designing Experiences People Love
moore
142
24k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Building an army of robots
kneath
306
45k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
460
Building Applications with DynamoDB
mza
96
6.6k
A Tale of Four Properties
chriscoyier
160
23k
Embracing the Ebb and Flow
colly
86
4.8k
Transcript
JavaScript Beyond $(document).ready()
speakerdeck.com/ evansolomon/ javascript-beyond-jquery
var name = 'Evan Solomon', twitter = name .replace(/ /g,
'') .replace(/^/, '@') .toLowerCase();
JavaScript != jQuery
1.Scope 2.Functions 3.Context 4.Inheritance 5.Control Flow
1. Scope
Always use the var keyword in declarations
var place = 'Milwaukee'; console.log(place); // 'Milwaukee'
Variables are implicitly global
var place = 'Milwaukee'; place === window.place; // true place
=== this.place; // true
Variable access flows down
var place = 'Milwaukee'; function where() { return place; }
where(); // 'Milwaukee'
2. Functions
Functions are closures
function quiet() { var whisper = 'Boom!'; } console.log(whisper); //
Undefined
But don’t forget var
function noisy() { oops = 'Boom!'; } console.log(oops); // 'Boom!'
Functions can be anonymous
jQuery(function() { return 'Ready!'; });
jQuery(function($) { $('.header').hide(); }); // We can use the $
to access jQuery in WordPress
Functions can execute themselves
(function() { return 'See?'; })(); // 'See?'
3. Context
Everything is an object Well, almost everything
var talk = function() { console.log('Hello!'); }; talk instanceof Object
// true
'Evan'.length // 4
var people = [ 'Evan', 'Alison' ]; people.join(', '); //
'Evan, Alison'
The this keyword gives context
this === window; // true
var context = 'global'; (function() { return this.context; })(); //
'global'
var context = 'global', stuff = { context: 'object', show:
function() { return this.context; } }; stuff.show(); // object
var Thing = function() { this.context = 'instance'; this.show =
function() { return this.context; }; }; thing = new Thing; thing.show(); // instance
Context is tricky
var context = 'global', stuff = { context: 'object', show:
function() { return this.context; } }, ohnoes = stuff.show; ohnoes(); // global
Context is controllable
var context = 'the window', show = function() { return
this.context; }; show.call(); // 'the window' show.call({context:'anything'}); // 'anything'
Context can be bound
var that = {context: 'safe'}, show = function() { return
this.context; }, bound = function() { return show.apply(that); }; show(); // undefined bound(); // 'safe'
4. Inheritance
Inheritance comes from prototypes
var nums = [1, 2]; nums.slice === Array.prototype.slice // true
nums.slice === nums.constructor.prototype.slice // true nums.constructor === Array // true
String.prototype.canadianize = function() { return this + ', eh!'; };
'Hello'.canadianize(); // 'Hello, eh!'
var evan = new Person('Evan'), john = new Person('Alison'); Person.prototype.sayHi
= function() { return 'I am ' + this.name; }; evan.sayHi(); // 'I am Evan' john.sayHi(); // 'I am Alison'
5. Control Flow
JavaScript is often asynchronous
$content = wp_remote_get($url); // $content is ready to use
var content = $.get(url); // content is *not* the body
of the remote response
$.get(url, { success: function(content) { // Now you can use
content } });
$(document).ready(function() { // Now the DOM is loaded });
$(function() { // Now the DOM is loaded }); https://github.com/jquery/
jquery/blob/2.0.2/src/ core.js#L162-L166
$('.thing').on('click', function() { // Now the element has been clicked
});
var request = $.get(url); request.done(function(content) { // Now the content
is available });
Thanks
Underscore is a utility library
var wordcamps = [ {place: 'Milwauke', when: 'today'}, {place: 'San
Francisco', when: 'later'}, ]; _.pluck(wordcamps, 'when'); // ['today', 'later']
var people = [ 'Evan', 'John', 'Alison', 'John' ]; _.uniq(people);
// ['Evan', 'John', 'Alison']
var go = function() { return 'Be patient'; }, notYet
= _.after(2, go); notYet(); // Undefined notYet(); // 'Be patient'
Underscore has great docs underscorejs.org
CoffeeScript compiles to JavaScript
var notYet = _.after(2, function() { return 'Be patient'; }
); notYet(); // Undefined notYet(); // 'Be patient'
notYet = _.after 2, -> 'Be patient' notYet() // Undefined
notYet() // 'Be patient'
easyObject = key: 'val' more: 'No problem' var easyObject; easyObject
= { key: 'val', more: 'No problem' };
implicitReturns = -> 'This is fun' implicitReturns() // 'This is
fun'
coffeescript.org & codeschool.com
Node.js is JavaScript on the server
var fs = require('fs'); fs.readFile('./stuff.txt', function(err, data) { console.log(data.toString()); });
var http = require('http'), server = function (req, res) {
res.end('Hello World!\n'); }; http.createServer(server) .listen(8080);