extend.js

function extend() {
  var result = arguments[0];
  for(var i = 1; i < arguments.length; i++) {
    for(var key in arguments[i]) {
      result[key] = arguments[i][key];
    }
  }
  return result;
}

extendable-create-object.js

var CreateObj = function() {
   return extend.bind(this, {
   }).apply(this, arguments);
}