Inheritance in JavaScript for EcmaScript 3

inherit.js

/**
 * One more version of inheritance for ES3
 * @author Kichrum
 */

var inherit = function(Parent) {
  var Child = function(){ Parent.apply(this, arguments) }
  // We can use
  // Child.prototype = Object.create(Parent.prototype)
  // here for ES5 instead of next 3 lines:
  var F = function() {}
  F.prototype = Parent.prototype
  Child.prototype = new F()
  return Child
}

var Animal = function(name) { this.name = name }
Animal.prototype.say = function() { console.log('an ' + this.name) }
var Dog = inherit(Animal)
Dog.prototype.say = function() { console.log('dog ' + this.name) }

var a = new Animal('a')
var b = new Dog('b')
a.say()
b.say()