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A conditional statement in Haskell whose right-hand side will only be evaluated if the guard statement evaluates to true. A list of guard statements are normally evaluated in a top to bottom order. f x | x > 0 = 1 | otherwise = 0

The guard statements occur after each "|" and before the "=".

Similar to the mathematic notation:

In this case the guard conditions are the "if" and "otherwise" statements.

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