JavaScript function execution in object

Question

I want to add a function to some object (in a form of a variable) and execute it when i need too.
How to do this?
Thanks.

Answer 1

obj.doSomething = function()
{
 console.log('done');
}
obj.doSomething();

This won't affect any of obj's existing fields or methods (the obvious exception being if there's already a doSomething).

Answer 2

var myFunc = function() { ... };
var myObj = { func: myFunc };
myObj.func();

You can also skip the myFunc temporary variable if you want to.

Answer 3

Pretty vague, but here you go:

var obj = {};
obj.foo = function() {
 return "baz";
};
// code...
obj.foo();