roperzh/essential.js

/*!
 * Includes proto-js by Axel Rauschmayer
 * https://github.com/rauschma/proto-js
 */

if (!Object.getOwnPropertyDescriptors) {
  Object.getOwnPropertyDescriptors = function (obj) {
    var descs = {};
    Object.getOwnPropertyNames(obj).forEach(function (propName) {
      descs[propName] = Object.getOwnPropertyDescriptor(obj, propName);
    });
    return descs;
  };
}

var Proto = {
  new: function () {
    var instance = Object.create(this);
    if (instance.constructor) {
      instance.constructor.apply(instance, arguments);
    }
    return instance;
  },

  extend: function (subProps) {
    var subProto = Object.create(this, Object.getOwnPropertyDescriptors(subProps));
    subProto.super = this;
    return subProto;
  }
};

Function.prototype.extend = function (subProps) {
  var constrFunc = this;
  var tmpClass = Proto.extend.call(constrFunc.prototype, Proto);
  return tmpClass.extend(subProps);
};