new_operater.js

function Rocker(name){
  this.name = name;
};

Rocker.prototype.getName = function(){
  return this.name;
}


//https://rockjins.github.io/2017/01/18/new-object/

var createObject = function(){
  var obj = new Object(),   //(1)
      Constructor = [].shift.call(arguments);   //(2)

  obj.__proto__ = Constructor.prototype;    //(3)

  var ret = Constructor.apply(obj, arguments);    //(4)

  return typeof ret === 'object' ? ret : obj;   //(5)
};

var shock = createObject(Rocker, 'Shock');

console.log(shock.name);  //Shock

console.log(shock.getName());  //Shock

console.log(Object.getPrototypeOf(shock) === Rocker.prototype); //true