[Haskell-cafe] let vs. where

[Henning Thielemann]

On Thu, 15 Nov 2007, Bulat Ziganshin wrote:

> Hello Henning,
>
> Thursday, November 15, 2007, 2:31:07 PM, you wrote:
>
> > Btw. I would write here
> >   min 1 (max (-1) x)
> >  or even better define a function for such clipping, since it is needed
> > quite often.
>
> min 1 . max (-1)  is pretty standard, although i renamed them:
> atMax 1 . atLeast (-1)

I like to add, that it is not just fancy to use functions instead of
guards here. If you work with wrappers for software synthesizers like
CSound and SuperCollider, you cannot map a Haskell function over a signal,
say
  map (\x -> case x of _ | x < -1 -> -1 | x>1 -> 1 | otherwise -> x) signal
    but you can write
  Synth.min 1 $ Synth.max (-1) signal
 given that 'Synth.min' and 'Synth.max' call the pointwise minimum and
maximum functions of the software synthesizers.