[Haskell-beginners] Guards as extensions of patterns

[Russ Abbott]

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
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  Professor, Computer Science
  California State University, Los Angeles

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