MapSet.member-question-mark

You're seeing just the function member-question-mark, go back to MapSet module for more information.

member?(map_set, value)

member?(t(), value()) :: boolean()

Checks if map_set contains value.

iex> MapSet.member?(MapSet.new([1, 2, 3]), 2)
true
iex> MapSet.member?(MapSet.new([1, 2, 3]), 4)
false