[Haskell-beginners] where do i get wrong

[Bob Ippolito]

Packages and modules are not the same thing. Packages contain one or more
modules, they're typically just units of installation and not so much
something you deal with in the code.

If the tutorial hasn't talked about importing modules, then it's wrong.
Perhaps it's simply ancient and is written for some historical version of
Haskell that had these in Prelude? isLower is not part of Prelude, so you
must import it from somewhere. The IDE you're using is irrelevant.


On Sun, Mar 2, 2014 at 11:10 AM, Roelof Wobben <r.wobben at home.nl> wrote:

>  Thanks,
>
> isLower is in base package.
> The tutorial has not spoken about importing modules.
>
> I use the IDE of fpcomplete.
>
> Roelof
>
>
>
> Bob Ippolito schreef op 2-3-2014 20:02:
>
> isLower is not in the Prelude (the automatically imported module built-in
> functions). Here's the list of all functions in Prelude:
> http://hackage.haskell.org/package/base/docs/Prelude.html
>
>  isLower is in another module. You can figure that out by searching for
> "isLower" on Hoogle:
> http://www.haskell.org/hoogle/
>
>  You can even find it by searching for it by type, which is useful if you
> don't remember the precise name. Try searching for "Char -> Bool".
>
>  In other words, you'll need to import isLower from somewhere before you
> can use it.
>
>
>
> On Sun, Mar 2, 2014 at 10:45 AM, Roelof Wobben <r.wobben at home.nl> wrote:
>
>> Hello,
>>
>> I try to selfstudy haskell by following the yet another haskell tutorial.
>>
>> Now I have the exercise where I have a string and have to convert it into
>>  a list of Booleans based on lower cats letter using map.
>>
>> So i tried this
>>
>> x = "aBCde".islower:[]
>>
>> But I see this error : Not in Scope: 'isLower'.
>>
>> Where do I make my error.
>>
>> Do not give the answer otherwise I do not learn anything from it.
>>
>> Roelof
>>
>>
>> ---
>> Dit e-mailbericht bevat geen virussen en malware omdat avast!
>> Antivirus-bescherming actief is.
>> http://www.avast.com
>>
>> _______________________________________________
>> Beginners mailing list
>> Beginners at haskell.org
>> http://www.haskell.org/mailman/listinfo/beginners
>>
>
>
>
> _______________________________________________
> Beginners mailing listBeginners at haskell.orghttp://www.haskell.org/mailman/listinfo/beginners
>
>
>
>
> ------------------------------
>    <http://www.avast.com/>
>
> Dit e-mailbericht bevat geen virussen en malware omdat avast! Antivirus<http://www.avast.com/>actief is.
>
>
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://www.haskell.org/mailman/listinfo/beginners
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/beginners/attachments/20140302/945a3b65/attachment.html>