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Today's Topics:
1. another type problem (Roelof Wobben)
2. Re: another type problem (Brandon Allbery)
3. Re: another type problem (Roelof Wobben)
4. Re: another type problem (Brandon Allbery)
5. Re: another type problem (Roelof Wobben)
6. Re: another type problem (Alexey Shmalko)
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Message: 1
Date: Tue, 12 May 2015 16:00:01 +0200
From: Roelof Wobben <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: [Haskell-beginners] another type problem
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Message: 2
Date: Tue, 12 May 2015 10:03:33 -0400
From: Brandon Allbery <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] another type problem
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On Tue, May 12, 2015 at 10:00 AM, Roelof Wobben <[email protected]> wrote:
> init' (x:xs) = Just (x: (init' xs))
>
Remember that your init' produces Maybe [a], not [a].
--
brandon s allbery kf8nh sine nomine associates
[email protected] [email protected]
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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Message: 3
Date: Tue, 12 May 2015 16:11:07 +0200
From: Roelof Wobben <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] another type problem
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Message: 4
Date: Tue, 12 May 2015 10:16:56 -0400
From: Brandon Allbery <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] another type problem
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On Tue, May 12, 2015 at 10:11 AM, Roelof Wobben <[email protected]> wrote:
> I do not understand what you are saying to me.
>
> I know that init produces a Maybe [a] . That is why I did put a Just
> before it.
>
You are invoking it again though, and using its result as if it produces
[a] instead of Maybe [a].
--
brandon s allbery kf8nh sine nomine associates
[email protected] [email protected]
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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Message: 5
Date: Tue, 12 May 2015 16:21:47 +0200
From: Roelof Wobben <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] another type problem
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Message: 6
Date: Tue, 12 May 2015 14:24:08 +0000
From: Alexey Shmalko <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] another type problem
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Before cons'ing the result of init', you should check whether it's Just or
Nothing. What you're doing now is something along the line with 5 : Just 3
-- this won't typecheck.
On Tue, May 12, 2015 at 5:22 PM Roelof Wobben <[email protected]> wrote:
> Brandon Allbery schreef op 12-5-2015 om 16:16:
>
> On Tue, May 12, 2015 at 10:11 AM, Roelof Wobben <[email protected]> wrote:
>
>> I do not understand what you are saying to me.
>>
>> I know that init produces a Maybe [a] . That is why I did put a Just
>> before it.
>>
>
> You are invoking it again though, and using its result as if it produces
> [a] instead of Maybe [a].
>
> --
> brandon s allbery kf8nh sine nomine
> associates
> [email protected]
> [email protected]
> unix, openafs, kerberos, infrastructure, xmonad
> http://sinenomine.net
>
>
> _______________________________________________
> Beginners mailing
> [email protected]http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
> What is then the right way to do. I still do not understand what you are
> trying to make clear to me.
>
>
> Roelof
>
>
>
>
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