Created
March 1, 2013 15:30
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// Types | |
var one = 1; | |
var two = 2; | |
three; | |
window.three; | |
window.one = 1; | |
one = 1; | |
var one = []; | |
var one = {one: 1}; | |
one.two = 1; | |
[] + {}; | |
{} + []; | |
"1" + null; | |
undefined = true; | |
"1" == 1; | |
"1" === 1; | |
Math.sqrt(-1); | |
Math.sqrt(-1) === Math.sqrt(-1); | |
// functions | |
var fn = function(){ console.log(this.name); }; | |
window.name = 'jeff!'; | |
fn(); | |
// semicolons | |
var newFn = function(){ | |
return | |
'Why hi there!'; | |
}; | |
newFn(); | |
// this | |
var a = {name: 'a'}; | |
var b = {name: 'b'}; | |
fn.call(a); | |
fn.call(b); | |
// arguments | |
(function iffe(){ | |
console.log(arguments); | |
console.log(arguments.callee); | |
console.log(arguments.caller); // deprecated | |
console.log(arguments.length); | |
console.log(arguments.__proto__); // not array []; | |
})(one, two); | |
['one', 'two', 'three'].slice(); | |
// controlling this and partial application | |
var bind = function(fn, self){ | |
return function(){ | |
var args = [].slice.call(arguments); | |
return fn.apply(self, args) | |
}; | |
}; | |
var bound = bind(a, fn); | |
bound.call(b); | |
// prototypes | |
a.hasOwnProperty('name'); | |
a.__proto__; | |
var MyClass = function(){ | |
this.newName = 'Oh NO!'; | |
console.log(this); | |
}; | |
MyClass(); | |
console.log(newName); | |
var c = new MyClass(); | |
MyClass.prototype.hello = function(){ | |
console.log('HELLO NICAR!'); | |
}; | |
c.hello(); | |
MyClass.prototype.hello = function(){ | |
console.log('BYE!'); | |
}; | |
c.hello(); | |
c.__proto__; | |
// inheritance in javascript | |
super // <- oh no | |
var inherits = function(parent, child) { | |
var ctor = function(){}; | |
ctor.prototype = parent.prototype; | |
child._super = parent.prototype; | |
child.prototype = new ctor(); | |
child.prototype.constructor = child; | |
}; | |
var Other = function(){ | |
MyClass.call(this); | |
}; | |
inherits(MyClass, Other); | |
var o = new Other(); | |
o.hello(); | |
Other.prototype.hasOwnProperty('hello'); | |
Other.prototype.hello; | |
Other.prototype.__proto__.hasOwnProperty('hello'); | |
Other.prototype.__proto__; | |
Other.prototype.__proto__.constructor; | |
// Ok, now for the main event, writing evented code! | |
var extend = function(obj){ | |
var args = [].slice.call(arguments); | |
for(var i = 0; i < args.length; i++) | |
for(var j in args[i]) | |
obj[j] = args[i][j]; | |
return obj; | |
}; | |
extend({}, {name: 'hello!'}, {tag: '#NICAR'}); | |
var events = { | |
on : function(ev, fn){ | |
this._callbacks = this._callbacks || {}; | |
this._callbacks[ev] = this._callbacks[ev] || []; | |
this._callbacks[ev].push(fn); | |
} | |
}; | |
events.off = function(ev, fn){ | |
if(!this._callbacks[ev]) return; | |
var cbs = this._callbacks[ev], args = [].slice.call(arguments); | |
for(var i = 0; i < cbs.length; i++) | |
if(cb === fn) cbs.slice(1, i); | |
}; | |
events.trigger = function(ev) { | |
if(!this._callbacks[ev]) return; | |
var cbs = this._callbacks[ev], args = [].slice.call(arguments); | |
for(var i = 0; i < cbs.length; i++) | |
cbs[i].apply(this, args); | |
}; | |
var Publisher = function(){ | |
this.hello = 'yeah'; | |
this.on('hello', function() { console.log(this.hello); }); | |
}; | |
extend(Publisher.prototype, events); | |
var a = new Publisher(); | |
var Listener = function(){ | |
a.on('hello', function(){ console.log('heyo!'); }); | |
}; | |
var l = new Listener(); | |
a._callbacks | |
a.trigger('hello'); |
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