Demo of MoreLINQ's AwaitCompletion

MoreLinqAwaitCompletionDemo.linq

<Query Kind="Expression">
  <NuGetReference Prerelease="true">morelinq</NuGetReference>
  <Namespace>MoreLinq</Namespace>
  <Namespace>MoreLinq.Experimental</Namespace>
</Query>

Enumerable
    .Range(1, 5)
    .Select(x => TimeSpan.FromSeconds(x))
    .RandomSubset(5)
    .Index(1)
    .Pipe(e => Console.WriteLine($"Job #{e.Key} will take {e.Value}"))
    .AwaitCompletion(async (x, _) => { await Task.Delay(x.Value); return x; },
                     (x, t) => t.Result)
    // .AsSequential()
    // .AsOrdered()
    // .MaxConcurrency(2)
    .Pipe(e => Console.WriteLine($"Job #{e.Key} completed"))