A.Enum.filter

You're seeing just the function filter, go back to A.Enum module for more information.

Specs

filter(t(val), (val -> as_boolean(term()))) :: [val] when val: value()

Filters the enumerable, i.e. returns only those elements for which fun returns a truthy value.

Mirrors Enum.filter/2 with higher performance for Aja structures.