JavaScript Code Examples

example_1.js

// Sample A
var x = y;
function y(){};

// Sample B
var a = b;
var b = function(){};

// Sample C
i = j;
j = function(){};

// Question: What is the value of x, a and i?
console.log(x, a, i);

example_2.js

// Sample A
function a(){
  x = 1;
}

// Sample B
function b(){
  var x = 1;
}

// Sample C
x = 2;
function c(){
  var x = 1;
}

// Question: Explain the difference in how x is defined in these three examples

example_3.js

// User Constructor
function User(){
  this.getName = function(){}; 
}

// Task Constructor
function Task(){}
Task.prototype.getSummary = function(){};

var user = new User();
var task = new Task();

// Question: What is the result of these console statements? Why is this the case?
console.log(user.hasOwnProperty('getName'));
console.log(task.hasOwnProperty('getSummary'));