Can you alter a Javascript function after declaring it?

Question

Let\'s say I have var a = function() { return 1; }. Is it possible to alter a so that a() returns 2? Perhaps by editing a

Answer 1

You can change functions like other objects

var a1 = function(){return 1;}
var b1 = a1;
a1 = function(){
  return b1() + 1;
};
console.log(a1()); // return 2

// OR:
function a2(){return 1;}
var b2 = a2;
a2 = function(){
  return b2() + 1;
};
console.log(a2()); // return 2