JS call, apply ,bind

callApplyBind.js

// Consider an object having a num property
var obj = {num:2};

// Note the use of this in the function
var addToThis = function(a,b,c){
	return this.num + a+b+c;
};

// call is used to call a function on an object with the arguments passed along
var result = addToThis.call(obj,4,3,4); // functioname.call(object_to_be_called, arguments_to_function)
console.log(result); // 13

var array=[4,3,4];
// apply is similar to call, except that it takes an array of arguments instead of comma separated values
console.log(addToThis.apply(obj,array)); // 13 

// bind returns a function whose this property points to the passed object, which can then be called using a comma separated list of arguments
console.log(addToThis.bind(obj)(4,3,4));