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@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@haskell.org
http://www.haskell.org/mailman/listinfo/beginners