Re: [Haskell-beginners] where do i get wrong

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 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 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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