[Haskell-beginners] where do i get wrong

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