call() and apply() in JS

gistfile1.js

/***
 * Call and Apply in JavaScript
 ***/

var me = {
  firstName: "Jack",
  lastName: "Franklin",
  fullName: function(title, middleName) {
    return title + ". " + this.firstName + " " + middleName + " " + this.lastName;
  }
};


var bob = {
  firstName: "Bob",
  lastName: "Bobbington"
};

console.log(me.fullName("Mr", "Thomas"));
console.log(me.fullName.call(bob, "Master", "Bob"));
console.log(me.fullName.apply(bob, ["Master", "Bob"]));

function add() {
  var args = [].slice.call(arguments);
  var sum = 0;
  for(var i = 0; i < args.length; i++) {
    sum += args[i];
  }
  return sum;
};

console.log(add(1,2,3));