Caesar cipher - Ruby

caesar_ruby.rb

def caesar(text,key)
  asc = text.chars.map { |c| c.ord}
  shifted = asc.map { |c| c + key.to_i}
  return shifted.map { |c| c.chr }.join
end

puts caesar("Erfan", 5) # Should be --> Jwkfs
puts caesar("Ruby", 3) # Should be --> Uxe|
puts caesar("Rails", 2) # Should be --> Tcknu
puts caesar("Golang", 8) # Should be --> Owtivo