Concurrency

While you have a simple Future.all to run all futures in parallel (like Promise.all does), you might want to limit the concurrency at which you execute operations.

Using Future.concurrent, you can specify the maximum concurrency for your array of operations.

Future.concurrent(
  userIds.map((userId) => {
    // notice we return a function
    return () => getUserById(userId);
  }),
  { concurrency: 10 },
);