Send Beginners mailing list submissions to
beginners@haskell.org
To subscribe or unsubscribe via the World Wide Web, visit
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
or, via email, send a message with subject or body 'help' to
beginners-requ...@haskell.org
You can reach the person managing the list at
beginners-ow...@haskell.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Beginners digest..."
Today's Topics:
1. Is there an idiom for this? (Mark Carter)
2. Re: Is there an idiom for this? (emacstheviking)
----------------------------------------------------------------------
Message: 1
Date: Mon, 16 Nov 2015 11:44:35 +0000
From: Mark Carter <alt.mcar...@gmail.com>
To: beginners@haskell.org
Subject: [Haskell-beginners] Is there an idiom for this?
Message-ID: <5649c1a3.1010...@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Suppose I want to use an argument twice, as for example in the expression:
(\x -> (pred1 x) and (pred2 x))
Is there a shorter way of doing this?
------------------------------
Message: 2
Date: Mon, 16 Nov 2015 11:53:28 +0000
From: emacstheviking <obji...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Is there an idiom for this?
Message-ID:
<CAEiEuULHWhechDwUF417Rnr55RDrEVUFVOgiQ6=5-8jux3p...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I guess it depends on the final use cases... you could use currying to
partially evaluate some stuff ready, locked and loaded as it were but the
example you have given shows to distinct functions pres1 and pred2.
I guess the short answer is "yes" but it depends on how you do it!
:)
Sean
On 16 November 2015 at 11:44, Mark Carter <alt.mcar...@gmail.com> wrote:
> Suppose I want to use an argument twice, as for example in the expression:
> (\x -> (pred1 x) and (pred2 x))
>
> Is there a shorter way of doing this?
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20151116/78b641a6/attachment-0001.html>
------------------------------
Subject: Digest Footer
_______________________________________________
Beginners mailing list
Beginners@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
End of Beginners Digest, Vol 89, Issue 28
*****************************************
