Haskell guards

Haskell guards inside guards

f x | predicate1 =
         case () of                                -- () can only evaluate to ()
           () | predicate2 -> a
              | otherwise  -> b
    | otherwise  = c

Source: stackoverflow.com

Haskell guards

f x | predicate1 = expression1 | predicate2 = expression2 | predicate3 = expression3

Source: futurelearn.com

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