group anagram

// switchWordByIndex
// return new string switched by index
const switchWordByIndex = (words, index, wordSwitched) => (words.substr(0, index) + wordSwitched + words.substr(index + 1));

// swapWordBasedOnIndex
// return new string swaped
const swapStringBasedOnIndex = (words, indexWord, indexComparedWord) => {
  // switch first word as temporary words
  const switchFirstWord = switchWordByIndex(words, indexWord, words[indexComparedWord]);
  // switch second word and get the result
  return switchWordByIndex(switchFirstWord,indexComparedWord,words[indexWord]);
}

// sortAlphabet
// return sorted ascending by alphabet
const sortAlphabet = unsortedString => {
  let sorted = unsortedString.toLowerCase();
  
  for (let i = 0 ; i < sorted.length ; i++) {
    for(let j = i+1 ; j < sorted.length ; j++) {
      if (sorted[i] > sorted[j]) {
        sorted = swapStringBasedOnIndex(sorted, i, j);
      }
    }
  }
  return sorted;
}

// grouping anagram based of list data
const groupAnagram = listAnagram => {
  let result = {};
  
  for (let word of listAnagram) {
    const sortedWordAlphabet = sortAlphabet(word);
    
    if (result[sortedWordAlphabet]) {
      result[sortedWordAlphabet].push(word);
    } else {
      result[sortedWordAlphabet] = [word];
    }
  }
  return Object.values(result);
}

const words = ['kita', 'atik', 'tika', 'aku', 'kia', 'makan', 'kua'];

// assumed anagram Upper Case = Lower Case
// A,a = true | BB,Bb = true

// Test Case Function groupAnagram
// Result: [["kita", "atik", "tika"], ["aku", "kua"], ["kia"], ["makan"]]
console.log(groupAnagram(words));