[Haskell-cafe] Re: Suggestions for improvement

N. Raghavendra raghu at mri.ernet.in
Mon Oct 4 00:56:19 EDT 2010

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.


N. Raghavendra <raghu at mri.ernet.in> | http://www.retrotexts.net/
Harish-Chandra Research Institute   | http://www.mri.ernet.in/
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