when I tested my challenge code .. it has returned an error ” expected undefined to equal 1″ .. please tell me where is the issue

const digPow = (n, p) => {
  let k;
  n = n < 0 ? -n : n;
  p = p < 0 ? -p : p;
  let splittedStr = n.toString().split('');
  let result = splittedStr
    .map(digit => Math.pow(digit, p++))
    .reduce((curr, prev) => curr + prev, 0);
  k = (result / n) % 1 === 0 ? result / n : -1;

  console.log(parseInt(result), k);
};

digPow(89, 1);
digPow(92, 1);
digPow(695, 2);
digPow(46288, 3);