On 8/27/06, Neil Mitchell <ndmitchell@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