How to check if a string is an element of a string set?

For example the set is {"aaa" "bbb" "ccc"} and I want to check if mystring == "aaa" mystring == "bbb" mystring == "ccc" But in general, I would like to collect and represent the set in a data structure, and make the check as simple as possible.

Answer 1

[Image Analyst]

The ismember() function is used for this purpose.