Mohsin Kaleem

I'm a developer

Capitalization Check

String.define_method :capitalized? do
    self == self.downcase ||
      self == self.upcase ||
      self[0] == self[0].upcase && self[1..] == self[1..].downcase
end

#Challenge

SourceLanguageRuntime
DailyByteruby\(\mathcal{O}(n)\)

Check whether a string is capitalised correctly. This is the case if all letters are capitalised, no letters are capitalised or only the first letter is capitalised.

#Test Cases

"USA".capitalized? #=> true
"Calvin".capitalized? #=> true
"compUter".capitalized? #=> false
"coding".capitalized? #=> true