LeetCode: Determine If String Halves Are Alike Solution

1/**
2 * @param {string} s
3 * @return {boolean}
4 */
5var halvesAreAlike = function (s) {
6  const regex = new RegExp("[^aeiou]", "gi")
7  const N = s.length
8  return (
9    [s.substring(0, N / 2), s.substring(N / 2)]
10      .map(sub => sub.replace(regex, ""))
11      .map(sub => sub.length)
12      .reduce((acc, subLen) => acc.add(subLen), new Set()).size === 1
13  )
14}