JavaScript dynamic function name

Question

I need to dynamically assign the name of a function to an element of an associative array. This is my attempt which does not work. The problem I am asking for help with is here

Answer 1

If you want to store it as a function, pass the function directly. Otherwise, if you just want to store it as a string, then you can use the quotes.

Change:

cr['cmd1'] ='foo';

To:

cr['cmd1'] = foo;

Answer 2

Access the functions using this syntax window[function_name]('para1');

Your usage will be something like this

var msg = window[cr['cmd1']](x);

Answer 3

What you are doing there is assigning a function to an array. A more common pattern that you are probably trying to do is to call a function on an object with the array notation.

    <script type="text/javascript">
        var cr = {};
        cr.cmd1 = function foo(y){
            return y;
        };
        var x = 5;
        var msg = cr['cmd1'](x);  
        alert(msg);
    </script>

This code results in an alert box that contains the number 5.

Answer 4

I would use window[] and make sure its a function before trying to execute it since you don't have control over what is passed.

var f = window[cr['cmd1']];
if(typeof f==='function') {
  f(x);
}