leetcode uncommon words

uncommonwords.js

function uncommonWords(s1, s2) {
  const words1 = s1.split(' ');
  const words2 = s2.split(' ');

  const freq = new Map();

  for (const word of words1) {
    freq.set(word, (freq.get(word) || 0) + 1);
  }

  for (const word of words2) {
    freq.set(word, (freq.get(word) || 0) + 1);
  }

  const result = [];
  for (const [word, count] of freq) {
    if (count === 1) {
      result.push(word);
    }
  }
  return result;
}