Javascript call() & apply() vs bind()?

Question

I already know that apply and call are similar functions which setthis (context of a function).

The difference is with the way

Answer 1

It allows to set the value for this independent of how the function is called. This is very useful when working with callbacks:

  function sayHello(){
    alert(this.message);
  }

  var obj = {
     message : "hello"
  };
  setTimeout(sayHello.bind(obj), 1000);

To achieve the same result with call would look like this:

  function sayHello(){
    alert(this.message);
  }

  var obj = {
     message : "hello"
  };
  setTimeout(function(){sayHello.call(obj)}, 1000);