Create a prototype

createPrototype.js

    /**
     * Creates a new object that can be used as a protype for a ctor.
     * @param api object The object whose own properties are to be copied to
     * the new prototype object.
     * @param ctr function The constructor function which will be set as the
     * value of the new prototype's contructor property.
     * @returns an object that can be uses as a protytpe.
     */
    function createPrototype(api, ctr){
        var ownProps = Object.getOwnPropertyNames(api),
            prototype = {};
        ownProps.forEach(function(prop){
            prototype[prop] = api[prop];
        });
        prototype.constructor = ctr;
        return prototype;
    }