erperejildo

// try this online: https://codepen.io/Xiwi/pen/jOEXJRa?editors=0010
// (don't forget to open the console)

const getData = function(url) {
  axios.get(url)
    .then(function(response){
      let follow = response.data.follow;
      if (follow) {
        follow = follow.replace('challenge?', 'challenge.json?');
        console.log(follow);

erperejildo

// First try I was detecting if it was an array or not and create some loops
// if so, but I thought on an easier way to avoid some recursivity

const fixArray = function(array) {
  const arrayString = array.toLocaleString(); // "1,2,3..."  
  const fixedArray = arrayString.split(',').map(function(item) {
    return parseInt(item, 10);
  });
  
  console.log(fixedArray);