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Today's Topics:
1. Re: Unpacking tuples (Frerich Raabe)
2. Re: Unpacking tuples (mrx)
----------------------------------------------------------------------
Message: 1
Date: Mon, 04 Dec 2017 20:24:12 +0100
From: Frerich Raabe <ra...@froglogic.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Unpacking tuples
Message-ID: <91db987b7037b5ecacb0be1b0a81f...@froglogic.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed
On 2017-12-04 20:05, mrx wrote:
> Hi,
>
> If I have a function that produce tuples with three members and I want those
> members as parameters for a function that takes three parameters.
> How would I unpack that tuple?
>
> It seems that curry does the trick for tuples with two members.
>
> How do I do this when there are more than two members?
There are functions like 'curry3' (
http://hackage.haskell.org/package/utility-ht-0.0.14/docs/Data-Tuple-HT.html#v:curry3
) but I think if you don't need this very often, it might be easiest to just
go for
let (a,b,c) = f x in g a b c
--
Frerich Raabe - ra...@froglogic.com
www.froglogic.com - Multi-Platform GUI Testing
------------------------------
Message: 2
Date: Mon, 4 Dec 2017 21:40:46 +0100
From: mrx <patrik....@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Unpacking tuples
Message-ID:
<canzojbg1vvy5cqzbh6kwzatyvfkwbdhoxfuok479j1gpxkp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Den 4 dec 2017 20:25 skrev "Frerich Raabe" <ra...@froglogic.com>:
On 2017-12-04 20:05, mrx wrote:
> Hi,
>
> If I have a function that produce tuples with three members and I want
> those members as parameters for a function that takes three parameters.
> How would I unpack that tuple?
>
> It seems that curry does the trick for tuples with two members.
>
> How do I do this when there are more than two members?
>
There are functions like 'curry3' ( http://hackage.haskell.org/pac
kage/utility-ht-0.0.14/docs/Data-Tuple-HT.html#v:curry3 ) but I think if
you don't need this very often, it might be easiest to just go for
let (a,b,c) = f x in g a b c
Ok, so in general I would have to write the unpacking myself. Correct?
// Patrik
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