gistfile1.js

function Mage(name) {
    this.name = name
}
Mage.prototype = function() {
    return { cast:     cast
           , meditate: meditate }

    function cast(spell, can) {
        if (can) return this.name + " cast " + spell
        else     return "Nothing happens!"
    }
    function meditate() {
        return "You start meditatin... zzz"
    }
}()


inherit(Apprentice, Mage.prototype)
function Apprentice(name) {
    upper(this, "constructor", name)
}
extend(Apprentice.prototype, function() {
    return { cast: cast }
    function cast(spell, can) {
        return upper(this, "cast", spell, can || Math.random() < 0.5)
    }
}())


inherit(Sorcerer, Apprentice.prototype)
function Sorcerer(name) {
    upper(this, "constructor", "Mighty " + name)
}
extend(Sorcerer.prototype, function() {
    return { cast: cast }

    function cast(spell) {
        return upper(this, "cast", spell, true)
    }
    function meditate() {
        return "...Your magic has increased!"
    }
}())