Subj : Re: how to create an instance of class whose name is dynamic?
To   : Jun Yang
From : Brendan Eich
Date : Wed Aug 31 2005 06:27 pm

Jun Yang wrote:
> Hi all,
> 
> I have something like below.
> 
> function create(className)
> {
>     return new <className>;
> }
> 
> Of course this is illegal in JavaScript.  How can I create an instance 
> of a class whose name is dynamic?

Several ways:

1.  If the name is the value of a property in an object, you can say new 
obj[className] (or new obj[className](...) if there are arguments to pass).

2.  Use eval.  1 is cheaper, so you should avoid this if you can.

/be

.