Group Anagrams

function groupAnagrams(words) {
  const groupedWords = words.reduce((obj, word) => {
    const sortedWord = word.split('').sort().join('')
    if (!obj[sortedWord]) {
      obj[sortedWord] = []
    }
    obj[sortedWord].push(word)
    return obj
  }, {})

  return Object.values(groupedWords)
}