extend arbitrary classes with your prepoerties; this works just like the Backbone.js variant, but is now situated under Object.

Object#extend

Object.defineProperty(Object.prototype, 'extend', {value: function (proto_props) {
    var child  = proto_props.hasOwnProperty('constructor') ? 
        proto_props.constructor : 
        function () {child.__super__.constructor.apply(this, arguments);};
     

    child.prototype = Object.create(this.prototype);
    child.prototype.constructor = child;
    
    Object.keys(proto_props).forEach(function (key) {
        child.prototype[key] = proto_props[key];
    });

    child.__super__ = this.prototype;
    return child;
}}); //snatched from backbone.js