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List:       haskell
Subject:    Re: [Haskell] (.) . (.)
From:       Dominic Steinitz <dominic.steinitz () blueyonder ! co ! uk>
Date:       2006-05-29 6:28:29
Message-ID: 447A948D.5000705 () blueyonder ! co ! uk
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Taral wrote:
> On 5/28/06, Dominic Steinitz <dominic.steinitz@blueyonder.co.uk> wrote:
>> Is this defined in some library? Thanks, Dominic.
> 
> Don't think so. I use:
> 
> \a b -> f (g a b)
> 
Taral,

Thanks. What prompted this question is that I find myself writing things 
like:

foo = ((.).(.)) concat intersperse

I think

foo' = \a b -> concat (intersperse a b)

is probably clearer but I ended up writing

infixr $.
($.) = (.) . (.)

and then

foo' = concat $. intersperse

Of course one could go on and define

infixr $..
($..) = (.) . (.) . (.)

and so on.

I just wondered if there was a standard nomenclature for such functions 
a la liftM, liftM2 etc?

The answer seems to be no.

Thanks, Dominic.



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