text: const test1 = ['a', 'b', 'c', 'd'];
  const test2 = [1, 2, 3, 4];
  
  function zipList(list1, list2) {
    const newList = [];
    for (let i = 0; i < list1.length; i++) {
      newList.push(list1[i]);
      newList.push(list2[i]);
    }
    return newList;
  }
  
  function zipListTheSimpleWay(list1, list2) {
    return _.flatten(_.zip(list1, list2), 1);
  }
  
  console.log(zipList(test1, test2));
  console.log(zipListTheSimpleWay(test1, test2));
  