Question

I’d like to know if there is a function in Erlang can help me know whether an element is in a tuple or not. Like sets:is_element/2.

Tuple = {aaa,bbb,ccc}.
is_element_of_tuple(Tuple, aaa)  % => true
is_element_of_tuple(Tuple, ddd)  % => false

Answer 1

You can always transform the tuple to a list using tuple_to_list/1:

is_element_of_tuple(Tuple, Element) ->
    lists:member(Element, tuple_to_list(Tuple)).