A.Enum.find

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

find(enumerable, default \\ nil, fun)

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Specs

find(t(val), default, (val -> as_boolean(term()))) :: val | default
when val: value(), default: value()

Returns the first element for which fun returns a truthy value. If no such element is found, returns default.

Mirrors Enum.find/3 with higher performance for Aja structures.