What is the difference between call and apply?

Question

What is the difference between using call and apply to invoke a function?

var func = function() {
  alert(\'hello!\');
};
         


        

Answer 1

It is useful at times for one object to borrow the function of another object, meaning that the borrowing object simply executes the lent function as if it were its own.

A small code example:

var friend = {
    car: false,
    lendCar: function ( canLend ){
      this.car = canLend;
 }

}; 

var me = {
    car: false,
    gotCar: function(){
      return this.car === true;
  }
};

console.log(me.gotCar()); // false

friend.lendCar.call(me, true); 

console.log(me.gotCar()); // true

friend.lendCar.apply(me, [false]);

console.log(me.gotCar()); // false

These methods are very useful for giving objects temporary functionality.