case עם מחלקות ו־Regex

def describe(value)
  case value
  when Integer then "a whole number"
  when Float   then "a decimal"
  when String  then "some text"
  else              "something else"
  end
end

puts describe(42)      # מספר שלם
puts describe(3.14)    # מספר עשרוני
puts describe("hi")    # קצת טקסט

def kind_of(text)
  case text
  when /^\d+$/        then "all digits"
  when /@/            then "looks like an email"
  when /^[A-Z]/       then "starts with a capital"
  else                     "other"
  end
end