class RotationalCipher {

  static rotate(text, shift) {
    return [...text].map((c) => {
      const isUpper = c.match(/[A-Z]/);
      const isAlpha = c.match(/[a-z]/i);
      const charShift = (isUpper ? 'A' : 'a').charCodeAt(0);

      return isAlpha ?
        String.fromCharCode((((c.charCodeAt(0) - charShift) + shift) % 26) + charShift) : c;
    }).join('');
  }

}

export default RotationalCipher;