[Haskell-beginners] Re: mind your head, was: Parsing a file with data divided into sections

Magnus Therning wrote: [...]

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isSection line = not . isSpace . head $ line

In this particular case I would use: isSection = null . takeWhile isSpace

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Prelude.head: empty list see also http://haskell.org/haskellwiki/Haskell_programming_tips#Partial_functions_li...

Another course of action would be to add exception handling; if head throws an exception then the input file isn't following the accepted syntax.

I'ld rather check all lines before (or filter non empty ones) than trying to catch Prelude.head: empty list! C.