:: (a -> Bool) -> [a] -> Maybe a package:ghc-internal

The find function takes a predicate and a list and returns the first element in the list matching the predicate, or Nothing if there is no such element. For the result to be Nothing, the list must be finite.

Examples

>>> find (> 4) [1..]
Just 5

>>> find (< 0) [1..10]
Nothing

>>> find ('a' `elem`) ["john", "marcus", "paul"]
Just "marcus"

The find function takes a predicate and a structure and returns the leftmost element of the structure matching the predicate, or Nothing if there is no such element.

Examples

Basic usage:

>>> find (> 42) [0, 5..]
Just 45

>>> find (> 12) [1..7]
Nothing