takeByPattern.js

const takeByPattern = (lists, pattern) => {
  let listsCopy = lists.map(l => l.slice());
  let relevantLists = listsCopy.filter((l, idx) => pattern.includes(idx));
  let finalList = [];

  const totalRemaining = () => relevantLists.map(l => l.length).reduce((sum, count) => sum + count, 0);

  while(totalRemaining() > 0) {
      pattern.forEach(idx => finalList.push(listsCopy[idx].shift()));
  }
    
  return finalList.filter(element => element);
}