How can I invoke a function whose name is stored in a variable?

Question

I have a funcion whose name is stored in a variable , How can I invoke it?

var fun_name='foo'

Answer 1

If if function is available in global space

window[fun_name]()

If is a member of an object then obj[fun_name]()

Ex:

var obj = {
    foo: function(){}
}
obj[fun_name]()

Answer 2

You can do that using.

window[fun_name]();

Answer 3

it will also have scope, so simply

scopeVar[fun_name](args);

or if global

window[fun_name](args);

Answer 4

You can use the "eval" function

This will call alert(3)

foo = 'alert(3)';
eval(foo);

Answer 5

Check this out. How to execute a JavaScript function when I have its name as a string

Or simply use a switch like follows:

switch(fun_name){
case "foo":
foo();
break;
case "foo2":
foo2();
break;
default:
fooDefault();
}