[Haskell] Exists any null instruction in Haskell?

[L. J.]

On 8/27/06, Neil Mitchell <ndmitchell at gmail.com> wrote:
> [Moving to haskell-cafe]
>
> Hi,
>
> > I want to know if it exists a null instruction (a instruction
> > that do anything
>
> Not really, since instructions don't "do anything" anyway - they only
> compute values.
>
> If you are in the IO monad then "return ()" is the do nothing.

 I need this answer. This is my case. Thanks you very much.

> In the function world, "id" is the do nothing.
>
> In recursive list processing, then something like [] is probably the
> "base case" in a recursive function, so stops the recursivity.
>
> If you give a more concrete example, then maybe we can give you a better answer.
>
> Thanks
>
> Neil
>