Afterthoughts - How I should have answered the interview question

Question:  Determine if two strings are anagrams.  For example, listen and silent are anagrams.
My Solution In Ruby:

"listen".chars.sort { |a, b| a.casecmp(b) } .join == "silent".chars.sort { |a, b| a.casecmp(b) } .join ? "They are anagrams" : "They are NOT anagrams"