Question

I have a really long winded switch case statement like this

switch(x){
   case "a":
      // call function a
      a():
      break;
   case "b":
      // call function b
      a():
      break;
   case "c":
     // call function c
     c():
     break;
}

Can’t i simply say

// If the x variable is set, call the corresponding function
 If (x){
  x();
}

The only reason its not working is because it thinks that im calling the function x(), but i want to use x as a placeholder for other functions. Is this possible?

Answer 1

It depends where your function is defined. If its defined in global scope, you can say:
if (window[x]) window[x]();

If its part of an object which is in global scope, say:

var obj = function() {
  this.x = function() {
      // do something
      };
}

then you can call it like:

window[obj][x]();

This is to get you started. You should add null checks and whether its really a function or not in your final routine.

If you use jQuery, you can check by saying: if (jQuery.isFunction(window[x])) window[x]();