In ruby how do you tell if a string input is in uppercase or lowercase?

Question

I am trying to write a program that when a single letter is inputted, if it\'s in uppercase, leave it in uppercase and return it, and if it\'s in lowercase, then convert to

Answer 1

For a single string you can use start_with? method as well.

user_input = gets.chomp

if user_input.start_with?(user_input.downcase)
    user_input.upcase!
end