Proposal reminder: Add functions to get consecutive elements to Data.List

David Feuer david.feuer at gmail.com
Thu May 19 05:37:59 UTC 2016


You promised a collection of use cases. I seem to have missed it. Could you
send the link again?
On May 19, 2016 1:35 AM, "Johan Holmquist" <holmisen at gmail.com> wrote:

> The discussion period for this proposal is near (31 of May).
>
> So far I count 1 for and 2 against the proposal.
>
> Joachim Breitner made a good enumeration of some advantages of adding
> these to base. Here is an enumeration of pros:
>
> * Availability in Data.List gives this pattern a common name.
>
> * A common name for this makes code easier to read and decreases the risk
> of getting the definition wrong.
>
> * The argument won't have to be repeated, hence making it easier to chain
> the functions.
>
> * List-fusion potential.
>
>
> Tobias Florek pointed out that `zip <*> tail` can be used to define this
> inline without the need for repeating the argument and made a reference to
> the Fairbairn threshold. This is elegant, but I am afraid that people might
> consider this obscure code golfing if used.
>
> Cheers
> Johan Holmquist
>
>
> ---------- Forwarded message ----------
> From: Henning Thielemann <lemming at henning-thielemann.de>
> Date: 2016-04-13 13:28 GMT+02:00
> Subject: Re: Proposal: Add functions to get consecutive elements to
> Data.List
> To: Johan Holmquist <holmisen at gmail.com>
> Cc: Haskell Libraries <libraries at haskell.org>
>
>
>
> On Wed, 13 Apr 2016, Johan Holmquist wrote:
>
> It is not strictly more general because it cannot handle empty sequences.
>>
>
> Think of it as if it handles the non-[] case.
>
>
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