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March 28, 2011 14:00
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ejohn.org “Advanced JavaScript” Code Examples
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/* Chapter 14: Enforcing Function Context */ | |
// http://ejohn.org/apps/learn/#86 | |
Function.prototype.bind = function() { | |
var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift(); | |
return function() { | |
return fn.apply(object, args.concat(Array.prototype.slice.call(arguments))); | |
}; | |
}; | |
// function bind(context, name) { | |
// return function() { | |
// return context[name].apply(context, arguments); | |
// }; | |
// } | |
var Button = { | |
click: function(value) { | |
this.clicked = value; | |
} | |
}; | |
var elem = document.createElement("div"); | |
elem.innerHTML = "Click me!"; | |
elem.onclick = Button.click.bind(Button, true); | |
document.body.appendChild(elem); | |
elem.onclick(); | |
console.log(Button.clicked); | |
/* Chapter 12: Inheritance */ | |
// http://ejohn.org/apps/learn/#78 | |
function Person() {} | |
Person.prototype.getName = function() { | |
return this.name; | |
}; | |
function Me() { | |
this.name = "Manfred"; | |
} | |
Me.prototype = new Person(); | |
var me = new Me(); | |
me.getName(); | |
/* Chapter 9: Temporary Scope */ | |
// http://ejohn.org/apps/learn/#62 | |
var count = 0; | |
for(var i=0; i<4; i++) (function(i) { | |
setTimeout(function() { | |
console.log(i); | |
}, i* 250); | |
})(i); | |
/* Chapter 8: Closures */ | |
// http://ejohn.org/apps/learn/#52 | |
var count = 0; | |
var timer = setInterval(function() { | |
if(count <= 5) { | |
console.log(count); | |
count++; | |
} else { | |
clearInterval(timer); | |
} | |
}, 250); | |
// http://ejohn.org/apps/learn/#53 | |
var count = 1; | |
var elem = document.createElement("div"); | |
elem.innerHTML = "Click Me!"; | |
elem.onclick = function() { | |
console.log(count++); | |
}; | |
document.body.insertBefore(elem, document.body.firstChild); | |
// http://ejohn.org/apps/learn/#54 | |
function Ninja() { | |
var slices = 0; | |
this.getSlices = function() { | |
return slices; | |
}; | |
this.slice = function() { | |
slices++; | |
} | |
} | |
var ninja = new Ninja(); | |
ninja.slice(); | |
ninja.getSlices() == 1; | |
/* Chapter 7: Flexible Arguments */ | |
// http://ejohn.org/apps/learn/#40 | |
function merge(root) { | |
for(var i = 0; i < arguments.length; i++) { | |
for(var key in arguments[i]) { | |
root[key] = arguments[i][key]; | |
} | |
} | |
return root; | |
} | |
merge({a: 1}, {b: 2}, {c: 3, d: 4, e: 5}); | |
// http://ejohn.org/apps/learn/#41 | |
Array.prototype.min = function() { | |
return Math.min.apply(Math, this); | |
} | |
Array.prototype.max = function() { | |
return Math.max.apply(Math, this); | |
} | |
[222, 333, 111].min(); | |
[222, 333, 111].max(); | |
// http://ejohn.org/apps/learn/#45 | |
function highest() { | |
return Array.prototype.slice.call(arguments).sort(function(a, b) { | |
return b - a; | |
}); | |
} | |
highest(99, 1111, 222)[0]; | |
// http://ejohn.org/apps/learn/#46 | |
function multiMax(multi) { | |
var allButFirst = Array.prototype.slice.call(arguments, 1); | |
var largestAllButFirst = Math.max.apply(Math, allButFirst); | |
return multi * largestAllButFirst; | |
} | |
multiMax(3, 1, 2, 3); |
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