emoji から codepoints に変換 "".unpack("U*") => [128077] "".codepoints => [128077] # Convert to hexadecimal "".each_codepoint.map {|n| n.to_s(16) } => ["1f44d"] codepoints から emoji に変換 [128077].pack("U*") => "" 0x1f44d.chr('UTF-8') =>…