Constructors

gistfile1.js

// Copies properties in `properties' to `prototype'
function provides(prototype, properties) {
    Object.keys(properties).forEach(function(key) {
        prototype[key] = properties[key] })

    return prototype
}

// Inherits from an object
function inherits(ctor, base) {
    ctor.prototype = Object.create(base)
    ctor.prototype.constructor = ctor
    return ctor
}

// Sample stuff
function Mage(name) {
    this.name = name
    this.job  = 'Mage'
} provides (Mage.prototype, function() {
    return { cast: cast }

    function cast(magic) {
        console.log(this.name + ' cast ' + magic)
    }
}())

inherits(BlackMage, Mage.prototype)
function BlackMage(name) {
    Mage.call(this, name)
    Mage.job = 'Black Mage'
} provides (BlackMage.prototype, function() {
    return { fira:     fira
           , watera:   watera
           , blizarra: blizarra }

    function fira()    { this.cast('fira')     }
    function watera()  { this.cast('watera')   }
    function blizarra(){ this.cast('blizarra') } 
}())