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Re^12: 99 Problems in Perl6

by gaal (Parson)
on Dec 17, 2006 at 18:04 UTC ( #590327=note: print w/replies, xml ) Need Help??

in reply to Re^11: 99 Problems in Perl6
in thread 99 Problems in Perl6

Similar syntax exists in Haskell and is called a guard.

-- Here the |s should be read as one vertical line, like a mathematica +l function def. fact n | n == 0 = 1 | otherwise = n * fact (n - 1) -- Here's the same thing in different style, the same one as I'd used +earlier and -- called "declarative", sometimes called direct pattern matching, bec +ause each -- variant gets to bind whatever it managed to match. fact 0 = 1 fact n = n * fact (n - 1)

There are plenty of non-syntactic variations on this theme. The scanl one is my favorite.

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