differ.js

const { removed, added, ordered, pureChanged,prevList, list } = result;

const nextList = prevList.slice();

removed.forEach(index => {
  nextList.splice(index, 1);
});
ordered.forEach(([from, to], i) => {
  nextList.splice(from, 1);
  nextList.splice(to, 0, list[pureChanged[i][1]]);
});
added.forEach(index => {
  nextList.splice(index, 0, list[index]);
});

// `nextList` is the same as `list`.
console.log(nextList, result.list);