static toAlphanumeric(input) {
    const valueOutOf36 = Math.round(input * 35);
    if (valueOutOf36 < 10) return valueOutOf36.toString();
    return String.fromCharCode(97 + valueOutOf36 - 10);
  }
Returns a random character from the character class [a-z0-9].
@param {number} input
@return {string}