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Module: Maybe
Function: isNothing
Type: Maybe a -> Bool
Description: returns True if the argument is Nothing
Related:

Example 1

Input: isNothing (lookup 32 [(1,'A'),(2,'B'),(3,'C')])

Output: True

Example 2

Input: isNothing (lookup 3 [(1,'A'),(2,'B'),(3,'C')])

Output: False




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