[Haskell-cafe] Proposal: (.:) operator in base.

[Theodore Lief Gannon]

Well... there's that rather worrisome introductory paragraph of the
Data.Composition docs, though:

"This module is for convenience and demonstrative purposes more than it is
for providing actual value. I do not recommend that you rely on this module
for performance-sensitive code. Because this module is not based on
Prelude's (.), some chances at optimization might be missed by your
compiler."

On Fri, Aug 19, 2016 at 7:51 AM, Alex Belanger <i.caught.air at gmail.com>
wrote:

> I didn't even know about the composition package. I just wanted it to be
> readily available to everyone.
>
> A quick look, `composition` seems really nice and is probably more aligned
> with Haskell ecosystem's philosophy of keeping base to what is only stricly
> needed by GHC.
>
> These were some valuable feedback. I think I got my answer and we can let
> the thread die (:
>
> Much appreciated,
> Alex
>
> On Aug 19, 2016 9:08 AM, "Alexander Berntsen" <alexander at plaimi.net>
> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA512
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>> On 18/08/16 23:57, Mike Ledger wrote:
>> > IMO: I've never seen a compelling use of this; I think it decreases
>> > clarity, and barely shaves off any characters from equivalent "pointful"
>> > expressions.
>>
>> I think it quite compelling. An example:
>>
>> asSeconds :: Hour h -> Minute m -> Second s -> Second t
>> - -- | asSeconds take some 'TimeUnit's and convert them to 'Second's.
>> asSeconds h m s = MkSecond $ 3600 * timeVal h + 60 * timeVal m + timeVal s
>>
>> hmsToDiffTime :: Hour h -> Minute m -> Second s -> DiffTime
>> - -- | 'hmsToDiffTime' converts time of day in hours, minutes and seconds
>> to the
>> - -- time from midnight as a 'DiffTime'.
>> hmsToDiffTime = (secondsToDiffTime . timeVal) .:. asSeconds
>>
>>
>> As for putting it in base -- meh. I use the composition package, or
>> define it myself. So I agree with Oleg; -1.
>> - --
>> Alexander
>> alexander at plaimi.net
>> https://secure.plaimi.net/~alexander
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