[Haskell-cafe] Re: Suggestions for improvement

[N. Raghavendra]

At 2010-10-04T01:52:05+04:00, Victor Nazarov wrote:

> I suggest to pay more attention to haskell's standard library.
>
> "allButLast" is called "init" in Data.List module.

Thanks for that.   I should keep printouts of the Prelude handy.

> Second, do not use explicit recursion. You can capture recursion using
> some high-order function like map, filter, foldr and so on:
>
> lastToTheLength xs = map f xs
>   where f = const . last $ xs
>
> And last, your type signatures are too restrictive. You can apply your
> functions to arbitrary lists.
>
> lastToTheLength :: [a] -> [a]
>
> Standard library knowledge is very helpful in producing short and
> clear definitions.
>
> blowup = concat . zipWith replicate [1..]

That looks neat!  Many thanks for the detailed remarks.

Regards,
Raghavendra.

-- 
N. Raghavendra <raghu at mri.ernet.in> | http://www.retrotexts.net/
Harish-Chandra Research Institute   | http://www.mri.ernet.in/
See message headers for contact and OpenPGP information.