Seems like the underscore variable returns the result of the previous statement, and you can use it in assignment like you do with Erlang to eat up list members you don’t care about.

>> _
=> nil

>> 123
=> 123

>> _
=> 123

>> _, _, a = [1,2,3]
=> [1, 2, 3]

>> a
=> 3

>> _
=> 3