JavaScript Inheritance (light version)

JavaScript Inheritance (light version)

//thin 'Object.create()'
function JClass(parentProto) {
  var fun = new Function();
  fun.prototype = parentProto;
  return new fun();
}

// Parent  function
function ESS(name) {
  this.comma = ",";
}

ESS.prototype.print = function(name) {
   return "cl" + this.comma + "" + this.name;
}

// Child function
function Name() {
   ESS.call(this); 
}

/*
// 이 방법은 prototype chain이 형성되지는 않고, 부모의 것을 copy해온 것과 같다. (on의 proto 체인확인필요)
Name.prototype = ESS.prototype;
Name.prototype.constructor = Name;
var on = new Name();
on.setName("nayeon");
on.print();
*/

//Name.prototype = Object.create(ESS.prototype);
Name.prototype = JClass(ESS.prototype);
Name.prototype.constructor = Name;

// Child method
// TODO. make object copy method
Name.prototype.setName= function(name) {
   this.name = name;
}

// start call.
var on = new Name();
on.setName("gg");
on.print();

// confirm Prototype Chain . 
// expect 'true'
console.log(!!on.__proto__.__proto__.print);