lib.lists.count

Count how many elements of list match the supplied predicate function.

Inputs

pred

Predicate

Type

count :: (a -> bool) -> [a] -> int

Examples

count (x: x == 3) [ 3 2 3 4 6 ]
=> 2

Noogle detected

• lib.count

count =
    pred: foldl' (c: x: if pred x then c + 1 else c) 0;