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Retry

When some operations can fail, you might want to implement a retry logic.

Retry with maximum attempts​

If getUserById outputs a Result.Ok value, the future resolves, if it outputs a Result.Error, it re-executes getUserById.

// retry immediately after failure
Future.retry(() => getUserById(userId), { max: 3 });
// Future<Result<...>>

Rety with delay​

The function you pass Future.retry takes an attempt parameter, which is the current number of attempts. The count starts at 0.

// adding delay
Future.retry(
  (attempt) => {
    return Future.wait(attempt * 100).flatMap(() => getUserById(userId));
  },
  { max: 10 },
);
// Future<Result<...>>