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
520
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
3.2k
WordCamp Las Vegas -- Make stuff that people want
evansolomon
2
2.9k
You Have No Idea What Your Users Want
evansolomon
1
500
You Don't Know People
evansolomon
2
840
Other Decks in Technology
See All in Technology
LLM とプロンプトエンジニアリング/チューターをビルドする / LLM and Prompt Engineering and Building Tutors
ks91
PRO
0
220
Google Cloud の AI を支える裏側のインフラを垣間見る!
maroon1st
0
210
反実仮想機械学習とは何か
usaito
PRO
7
2.4k
シン・Kafka / shin-kafka
oracle4engineer
PRO
7
2.7k
Four keys改善の取り組み事例紹介
sansantech
PRO
3
230
日本におけるデータエンジニアリングのこれまでとこれから
foursue
14
2.6k
「ふりかえりのふりかえり」をふりかえり、実のあるふりかえりにする
naitosatoshi
0
230
Java EE/Jakarta EEの現状と将来―クラウドネイティブ時代にJava EEは対応できるのか?―
takakiyo
1
100
AWS を使う上で知っておきたいオンプレミス知識/aws-on-premise-essentials
emiki
1
4.2k
0→1開発における技術選定において一番大切なこと
bicstone
1
330
現代CSSフレームワークの内部実装とその仕組み
poteboy
6
1.8k
コードを書く隙間を見つけて生きていく技術/Findy 思考の現在地
fujiwara3
24
5.3k
Featured
See All Featured
Fantastic passwords and where to find them - at NoRuKo
philnash
36
2.5k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
29
6k
Building a Scalable Design System with Sketch
lauravandoore
455
32k
Stop Working from a Prison Cell
hatefulcrawdad
266
19k
Music & Morning Musume
bryan
41
5.6k
Writing Fast Ruby
sferik
620
60k
Building Better People: How to give real-time feedback that sticks.
wjessup
354
18k
We Have a Design System, Now What?
morganepeng
42
6.7k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
39
4.4k
Done Done
chrislema
178
15k
The World Runs on Bad Software
bkeepers
PRO
61
6.7k
Happy Clients
brianwarren
91
6.4k
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);