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                const addRanking = list => {
  // these variables will be used after an initial sort of the array
  let prevValue = undefined;
  let prevRanking = 1;
  // sort the array with a custom sort function (by points DESC, and name DESC)
  list.sort((a,b) => {
    // if they are tied
    if (a.points === b.points) {
      // sort by alphabetical name (sort function must return a number not a boolean)
      if ( > {
        return -1;
      } else {
        return 1;
    } else {
      // if they are not tied, sort by points
      return b.points - a.points;
  // after sorting the array, traverse it setting the current position
  }).forEach((el, idx) => {
    // if the previous points are the same as the current points
    if (prevValue === el.points) {
      // the ranking should be changed to the previous one
      el.ranking = prevRanking;
    } else {
      // otherwise, the ranking is the current position (+1 because JS starts in 0)
      el.ranking = idx + 1;
      // update the value of ranking and points for testing in the next element
      prevValue = el.points;
      prevRanking = el.ranking;

const list = [
    name: "John",
    points: 100,
    name: "Bob",
    points: 130,
    name: "Mary",
    points: 120,
    name: "Kate",
    points: 120,