fuckin with some xor stuff in javascript

xor_cipher.js

function cipher(message, key) {
  return message.split('')
    .map(function(element) {
      return (element.charCodeAt(0) ^ key);
    })
    .map(function(element) {
      return String.fromCharCode(element)
    })
    .join('');
}

function calculateKey(key) {
  return key.split('')
    .map(function(element) {
      return element.charCodeAt(0)
    })
    .join('');
}

var message = process.argv[2];
var key = calculateKey(process.argv[3]);

var encrypted = cipher(message, key);
var decrypted = cipher(encrypted, key);

console.log('plaintext: ' + message);
console.log('encrypted: ' + encrypted);
console.log('Key: ' + key);
console.log('decrypted: ' + decrypted);