What is the press count for texting on older T9 phones?

T9_press_count.rb

# best answer
def presses(phrase)
  groups = ["1", " 0", "ABC2", "DEF3", "GHI4", "JKL5", "MNO6", "TUV8", "PQRS7", "WXYZ9"]
  phrase.upcase.chars.map do |c|
    1 + groups.find { |grp| grp.include?(c) }.index(c)
  end.reduce(:+)
end

# another option
def presses(phrase)
  
  letters = phrase.upcase.split('').map { |s| s.to_s }

  score = 0
  
  letters.each do |letter|

    case letter
      when 'A','D','G','J','M','P','T','W',' ','1','*','#'
        score += 1

      when 'B','E','H','K','N','Q','U','X','0'
        score += 2

      when 'C','F','I','L','O','R','V','Y'
        score += 3

      when 'S','Z','2','3','4','5','6','7','8','9'
        score += 4
    end
   end
   
   return score
end