[Haskell-beginners] where do i get wrong

[Ryan Stradling]

isLower takes a character.  You need to look at operating on the string
with higher order functions which will call isLower on each character.
On Mar 2, 2014 2:25 PM, "Roelof Wobben" <r.wobben at home.nl> wrote:

>  Found this one:
>
> This is partly working:
>
> import Data.Char
>
> x = "aBCde".isLower
> -- Note that comments are preceded by two hyphens
> {- or enclosed
>    in curly brace/hypens pairs. -}
> main = print x
>
>
> But now I see this error:
>
>    -  Main.hs at 3:5-3:12
>    Couldn't match expected type `b0 -> c0' with actual type `[Char]' In
>    the first argument of `(.)', namely `"aBCde"' In the expression: "aBCde" .
>    isLower In an equation for `x': x = "aBCde" . isLower
>     -  In an equation for `x': x = "aBCde" . isLower
>
>
> Roelof
>
> Roelof Wobben schreef op 2-3-2014 20:10:
>
> 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
>>
>>
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>
>
>
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