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Ordered variants in Haskell let you do things like

funky (x:y:xs) = ... -- I'm guaranteed to have two elements or more funky (x:xs) = ... {- This pattern would have matched a long list, b +ut since the previous variant came first, we know the l +ist is of length 1 or 2. * -}

This is incredibly useful sometimes. Okay, when I want when I know where to find it. :-)

* For folks not familiar with Haskell who count three or two items in the two patterns and don't see why I'm talking of lists of at least two and one or two elements respectively: in Haskell, "(a:b)" means a is an element and b is a list of zero or more elements. That's why by convention you see names like "xs" and "ys", pronounced "exes" and "whys", though there's nothing in the language to enforce names like that. The expression (x:y:xs) means (x:(y:xs)).


In reply to Re^10: 99 Problems in Perl6 by gaal
in thread 99 Problems in Perl6 by Ovid

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    choroba still has one more.
    [Corion]: I have Thursday and Friday off, so then I might get to converting the rough outlines to more articles ;)
    [Corion]: But currently, most of the modules are web-related and I don't like to publish two web articles in a row
    [Corion]: Maybe I should do the Filter::Simple release on the next weeked - this would give me one more article to milk from this theme

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