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Today's Topics:
1. Re: Getting a specified number of lines from stdin
(frantisek kocun)
2. Re: Getting a specified number of lines from stdin
(Rein Henrichs)
3. Re: Getting a specified number of lines from stdin
(Rein Henrichs)
----------------------------------------------------------------------
Message: 1
Date: Fri, 11 Mar 2016 16:34:23 +0100
From: frantisek kocun <frantisek.ko...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Getting a specified number of lines
from stdin
Message-ID:
<camcun70z5-076w0wgdspnex5sh+dkvg3evcxhou38c73qka...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Here is the answer
http://stackoverflow.com/questions/34910992/iterate-io-actions-and-laziness
You need to write recursive function, not to use iterage or to
liftM (take 5) $ sequence $ repeat (unsafeInterleaveIO getLine)
On Sun, Mar 6, 2016 at 11:38 AM, Nicolaas du Preez <njdupr...@yahoo.com>
wrote:
> Good day All,
>
> Why does
>
> liftM (take 5) $ sequence $ repeat getLine
>
> not stop at reading only 5 lines from stdin but keeps on reading more?
>
> What I?m really trying to achieve is to get input from the user until
> an empty line is read with the code below. But this doesn?t work
> as I expected, similar to the above.
>
> liftM (takeWhile (/= "")) $ sequence $ repeat getLine
>
>
> Regards,
> Nicolaas du Preez
>
> _______________________________________________
> Beginners mailing list
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> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
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>
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Message: 2
Date: Fri, 11 Mar 2016 21:48:40 +0000
From: Rein Henrichs <rein.henri...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Getting a specified number of lines
from stdin
Message-ID:
<CAJp6G8z=ddfparxm7--mo-vw0n2g0zdcqlzznxpa+wf1i5y...@mail.gmail.com>
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That is an unnecessary use of unsafeInterleaveIO. The solution is actually
quite simple:
getLines n = replicateM n getLine
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Message: 3
Date: Fri, 11 Mar 2016 21:50:06 +0000
From: Rein Henrichs <rein.henri...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Getting a specified number of lines
from stdin
Message-ID:
<CAJp6G8x_AiVg6MBYpcTsNJSn=nfuzueljcd4x+jwewu7wm7...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Note that replicateM n k = sequence (replicate n k), so this solution is
equivalent to Henk-Jan van Tuyl's original solution.
On Fri, Mar 11, 2016 at 1:48 PM Rein Henrichs <rein.henri...@gmail.com>
wrote:
> That is an unnecessary use of unsafeInterleaveIO. The solution is actually
> quite simple:
>
> getLines n = replicateM n getLine
>
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