Amazon Interview Question for Software Developers

Country: United States

Comment hidden because of low score. Click to expand.
of 2 vote

Inheritance: YES

var o = {
  a: 2,
  m: function(b){
    return this.a + 1;

console.log(o.m()); // 3
// When calling o.m in this case, 'this' refers to o

var p = Object.create(o);
// p is an object that inherits from o

p.a = 12; // creates an own property 'a' on p
console.log(p.m()); // 13
// when p.m is called, 'this' refers to p.
// So when p inherits the function m of o, 
// 'this.a' means p.a, the own property 'a' of p

Overriding: YES

// Create a class
function Vehicle(color){
  this.color = color;

// Add an instance method
Vehicle.prototype.go = function(){
  return "Underway in " + this.color;

// Add a second class
function Car(color){
  this.color = color;

// And declare it is a subclass of the first
Car.prototype = new Vehicle();

// Override the instance method
Car.prototype.go = function(){
  return + " car"

// Create some instances and see the overridden behavior.
var v = new Vehicle("blue");
v.go() // "Underway in blue"

var c = new Car("red");
c.go() // "Underway in red car"

- anpganpg June 15, 2015 | Flag Reply
Comment hidden because of low score. Click to expand.
of 0 vote

Javascript supports only prototype inheritance which is different than normal inheritance (method instances are shared across multiple instances)

- smurugu October 18, 2016 | Flag Reply

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