new_constructor.js

// Crockford's new_constructor
// Act III: Function the Ultimate
// yuiblog.com/crockford

function new_constructor(extend, initializer, methods) {
  var func, prototype = Object.create(extend &&
                              extend.prototype);
  if (methods) {
    methods.keys().forEach(function (key) {
      prototype[key] = methods[key];
    });
  }
  func = function () {
    var that = Object.create(prototype);
    if (typeof initializer === 'function') {
      initializer.apply(that, arguments);
    }
    return that;
  };
  func.prototype= prototype;
  prototype.constructor= func;
  return func;
}