ES5 Object.extend

ES5 Object.extend.js

Object.defineProperty(Object, "extend", {
  enumerable: false,
  value: function extend(obj) {
    Array.prototype.slice.call(arguments, 1).forEach(function(current) {
      Object.getOwnPropertyNames(current).forEach(function(key) {
        Object.defineProperty(obj, key, Object.getOwnPropertyDescriptor(current, key));
      });
    });
    return obj;
  }
});