TOP's ruby project

main.rb

def caesar_cipher(msg, offset)
  msg_arr = []

  msg.chars.each do |m_char| 
    if m_char.match(/[A-Z]/)
      # wraps around 26 alphabets, mod 26
      msg_arr.push((m_char.ord + offset - 'A'.ord) % 26 + 'A'.ord)
    elsif m_char.match(/[a-z]/)
      msg_arr.push((m_char.ord + offset - 'a'.ord) % 26 + 'a'.ord)
    else
      msg_arr.push(m_char)
    end
  end

  encrypted_msg = msg_arr.map {|m_char| m_char.chr}
  return encrypted_msg.join
end

caesar_cipher("What a string!", 5)