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              // Set 1
var name = 'manish';
var jena = {
    name : 'jena'
var monica = {
    name : 'monica'

function whoAmI()
    document.write('You are '+ this.name +'<br/>')

whoAmI(); // this is window
var boundJenaWhoAmI = whoAmI.bind(jena) // this set to ema
boundJenaWhoAmI(); // this is ema
whoAmI.bind(monica)(); // Observe, bind doesn't invoke function, it returns a function

// Set 2
function howOldAmI()
    document.write('You are '+ this.age +' years old. <br/>')

var age = 15;
var ema = {
   age : 16,
   howOldAmI : howOldAmI
var angela = {
   age : 17,
   howOldAmI : howOldAmI.bind(ema)

howOldAmI(); // Context is global i.e. window, so window.age will be used
ema.howOldAmI(); // ema is calling, so ema is context, ema.age will be used
angela.howOldAmI(); // angela is calling, so angela is context, but we have bind it to ema, ema.age will be used

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