demostration how task works, C# and F#

demostration how task works.cs

// https://sharplab.io/#v2:C4LgTgrgdgNAJiA1AHwAICYCMBYAUKgBgAJVMA6AGQEsoBHAbj0JMwFZHcmAOEgNgB4awAHxEA4gFNgAMQD2sgBRCiVAJR4A3niI6SATj5kAIhIA2AQwCeCzAVUddLPUvvbdqAOwqOAXzx4AN3MwIgAPAGciAF4iAFEoCABbCTBzACNTCTIAJXMoAHMJGxgiW1UyAGUzCQBjYAVJGXlXXEc2vAAzWTAJcxqACwUgkNCVKDDwlqYDVF5jMysbAH0CVan8TGcAIkAeDcAQfa2WoA==

using System;
using System.Linq;
using System.Threading.Tasks;

async Task<int> GetFoo(int i)
{
    await Task.Delay(10);
    Console.WriteLine(i);
    return i;
}

var xs = Enumerable.Range(1, 10).Select(GetFoo);
         
foreach(var x in xs);

await Task.Delay(1_000);

Console.WriteLine("🌄");

demostration how task works.fs

// https://sharplab.io/#v2:DYLgZgzgNAJiDUAfA9gBwKYDsAEBlAnhAC7oC2A3ALABQaWehJpAdACoAWATugIYwCWmAOZseEANYQqtDDgLEybLrwHDy2GjWDoi2IToBiyZNn7YAvNiJjx2AN41sT7DGQBCbKxvMAIumA8+NgAjAAMjs6onIJEYDgARACk/PGmGtTO2NxEAK6cOPw0AL6a1Nq6AB4QFtgA2sHMzGEAutiIAHx46ACOzKQ8qHqGxqVgyJzYFaY4VS7IjgAUAJSONBzcfMy42uioC8EA+qHHKxnpUTFx2PGAPBuAIPvxNEA==

open System;
open System.Threading.Tasks;
open System.Threading; 

let getFoo i = task {
    do! Task.Delay 10
    printfn "%i" i 
    return i
}

let xs = [1..10] |> Seq.map getFoo

for x in xs do
 ()
 
Thread.Sleep(1_000)
  
printfn "🌄"