Check if a string is capitalized in Rails

Question

I'm looking to check if a string is all capitals in Rails. How would I go about doing that?

I'm writing my own custom pluralize helper method and I would something be passing words like "WORD" and sometimes "Word" - I want to test if my word is all caps so I can return "WORDS" - with a capital "S" in the end if the word is plural (vs. "WORDs").

Thanks!

Answer 1

Do this:

str == str.upcase

E.g:

str = "DOG"
str == str.upcase  # true
str = "cat"
str == str.upcase  # false

Hence the code for your scenario will be:

# In the code below `upcase` is required after `str.pluralize` to transform 
# DOGs to DOGS
str = str.pluralize.upcase if str == str.upcase

Answer 2

Or this:

str =~ /^[A-Z]+$/

e.g.:

"DOG" =~ /^[A-Z]+$/    # 0
"cat" =~ /^[A-Z]+$/    # nil