Javascript extend

javascript_extend.js

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

function Child (name, age) {
  Parent.call(this, name)
  this.age = age
}
Child.prototype = Object.create(Parent.prototype, {
  constructor: {
    writable: true, configurable: true, enumerable: false,
    value: Child
  }
})
Child.prototype.getAge = function getAge () { return this.age }