README.md

Javascript and prototypal inheritance

curl -s https://raw.github.com/gist/2467484/oop.js | node

oop.js

var ClassA = function (name) {
  if(arguments.length){
    this.name = name
  }
}

ClassA.prototype.setName = function (name) {
  this.name = name
}

var ClassB = function (name, lastName) {
  this.lastName = lastName
  ClassB.super_.call(this, name)
}

inherits(ClassB, ClassA)

ClassB.prototype.setAge = function (age) {
  this.age = age
}

var ClassC = function (age) {
  this.age = age
}

ClassC.prototype = new ClassA()
ClassC.prototype.constructor = ClassA
ClassC.prototype.setLastName = function (lastName) {
  this.lastName = lastName
}

console.log('ClassB.prototype', ClassB.prototype) // correct
console.log('ClassC.prototype', ClassC.prototype) // wrong



// https://github.com/joyent/node/blob/master/lib/util.js#L498
// here just because you *should* know how it works.

function inherits(ctor, superCtor) {
  ctor.super_ = superCtor
  ctor.prototype = Object.create(superCtor.prototype, {
    constructor: {
      value: ctor,
      enumerable: false,
      writable: true,
      configurable: true
    }
  })
}