What is the proper way to chain a list (IEnumerable) of EiherAsync/Aff ?

[guillaumeagile]

I have a IEnumerable<Aff>, and I would like to await them wall, like Task.WhenAll does.
I cannot achieve to write it in a FP way.
Can someone help?

[louthy]

IEnumerable<Aff<string>> mx = ...;

// Runs each item in the sequence after the previous one has completed
Aff<IEnumerable<string>> r2 = mx.SequenceSerial();

// Runs a number of the items in the sequence concurrently (see below)
Aff<IEnumerable<string>> r1 = mx.SequenceParallel();

With SequenceParallel you can also specify the maximum number of tasks to run concurrently:

var r1 = mx.SequenceParallel(10);

The default value is: SysInfo.DefaultAsyncSequenceParallelism which is defined to be Math.Max(1, ProcessorCount / 2). That property is mutable, so you can set the default for your whole application.

[guillaumeagile]

Thanks.
You confirm that Aff is the best structure (upon TryAsync or EitherAsync) to run a bunch of async operations ?