Leetcode - 796. Rotate String

https://leetcode.com/problems/most-common-word/

/**
 * @param {string} paragraph
 * @param {string[]} banned
 * @return {string}
 */
var mostCommonWord = function (paragraph, banned) {
  const onlyLowerCase = paragraph
    .toLowerCase()
    .split(/[ !?',;.]/)
    .filter((val) => val !== '');
  const hashTable = {};

  onlyLowerCase.forEach((word) => {
    if (!banned.includes(word)) {
      hashTable[word] = hashTable[word] + 1 || 1;
    }
  });

  const maxCount = Math.max(...Object.values(hashTable).map((value) => value));

  return Object.keys(hashTable).find((key) => hashTable[key] === maxCount);
};

Runtime: 75 ms, faster than 90.68% of JavaScript online submissions for Most Common Word.

Memory Usage: 43.9 MB, less than 82.19% of JavaScript online submissions for Most Common Word.