Re: [Haskell-cafe] Function composition in run-time?

On Wed, Aug 24, 2011 at 4:44 PM, Iustin Pop wrote:

On Wed, Aug 24, 2011 at 04:35:42PM +0400, dokondr wrote:

...

Hi, What is the Haskell way to compose functions in run-time? Depending on configuration parameters I need to be able to compose function in several ways without recompilation.

A simple alternative to if would be:

options = [ ("foo", f1 . f2 . f3) , ("bar", f1 . f3 )]

and then "lookup param options". I don't know if this is what you're looking for, though.

Thanks! Yes, this is what I need - simple and easy. Yet, how function application will work in this case ? I mean after lookup returns me a composition ... need to check what type will it be. -- All the best, dokondr