ruby - How can I check a word is already all uppercase?

Question

I want to be able to check if a word is already all uppercase. And it might also include numbers.

Example:

GO234 => yes
Go234 => no

Answer 1

You can compare the string with the same string but in uppercase:

'go234' == 'go234'.upcase  #=> false
'GO234' == 'GO234'.upcase  #=> true