Meteor multiple functions & future(s) result

gistfile1.txt

const range = [
  future => {
    Meteor.setTimeout(() => {
      future.return(1000);
    }, 1000);
  },
  future => {
    Meteor.setTimeout(() => {
      future.return(2000);
    }, 2000);
  },
  future => {
    Meteor.setTimeout(() => {
      future.return(3000);
    }, 3000);
  },
];
// iterate sequentially over the range to launch tasks
const futures = _.map(range, (task, index) => {
  const future = new Future();
  console.log('launching task', index);
  task(future);
  // accumulate asynchronously parallel tasks
  return future;
});
// iterate sequentially over the tasks to resolve them
const results = _.map(futures, (future, index) => {
  // waiting until the future has return
  const result = future.wait();
  console.log('result from task', index, 'is', result, 'prev', index > 0 ? futures[index - 1].value : 'none');
  // accumulate results
  return result;
});
//
console.log(results);
return results;