[Haskell-beginners] Guards as extensions of patterns

Russ Abbott russ.abbott at gmail.com
Wed Sep 29 23:17:31 EDT 2010

I never realized that a guard can be used as an extension of a pattern.  Is
this recommended coding? elem n xs asks whether n is an element of xs

elem :: (Eq a) => a -> [a] -> Bool

elem _ [] 		       = False
elem n (x:_) | n == x = True
elem n (_:xs)            = elem n xs

-- Russ Abbott
  Professor, Computer Science
  California State University, Los Angeles

  Google voice: 424-242-USA0 (last character is zero)
  blog: http://russabbott.blogspot.com/
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