Added WithRandomOffset helper method

Author: stidsborg

Core/Cleipnir.ResilientFunctions.Tests/UtilsTests/HelpersTests.cs

@@ -0,0 +1,25 @@
+using System.Linq;
+using Cleipnir.ResilientFunctions.Helpers;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Shouldly;
+
+namespace Cleipnir.ResilientFunctions.Tests.UtilsTests;
+
+[TestClass]
+public class HelpersTests
+{
+    [TestMethod]
+    public void AllElementsExistsWhenCreateEnumerableWithRandomOffset()
+    {
+        var randomOffsetEnumerable = Enumerable.Range(0, count: 10)
+            .ToList()
+            .WithRandomOffset();
+
+        var set = randomOffsetEnumerable.ToHashSet();
+        
+        Enumerable
+            .Range(0, count: 10)
+            .All(i => set.Contains(i))
+            .ShouldBeTrue();
+    }
+}

Core/Cleipnir.ResilientFunctions/Helpers/Helpers.cs

@@ -55,5 +55,16 @@ public static T[] RandomlyPermute<T>(this IEnumerable<T> t)
         return arr;
     }
 
+    public static IEnumerable<T> WithRandomOffset<T>(this IReadOnlyList<T> elms)
+    {
+        var offset = Random.Shared.Next(0, elms.Count);
+        var i = offset;
+        do
+        {
+            yield return elms[i];
+            i = (i + 1) % elms.Count;
+        } while (i != offset);
+    }
+    
     internal static string MinifyJson(string json) => Regex.Replace(json, "(\"(?:[^\"\\\\]|\\\\.)*\")|\\s+", "$1");
 }