From 464bff260782602ce477e707a42255cf3318e84a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9sar=20Morgan?= <xds_xps_ivx@hotmail.com>
Date: Sat, 18 Nov 2023 12:27:55 -0600
Subject: [PATCH] =?UTF-8?q?Funci=C3=B3n=20de=20enumeraci=C3=B3n=20con=20?=
 =?UTF-8?q?=C3=ADndice?=
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---
 src/Lib/MCART/Helpers/CollectionHelpers.cs     | 18 ++++++++++++++++++
 .../Helpers/CollectionHelpersTests.cs          |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/src/Lib/MCART/Helpers/CollectionHelpers.cs b/src/Lib/MCART/Helpers/CollectionHelpers.cs
index 564ae4751..e43251cfc 100644
--- a/src/Lib/MCART/Helpers/CollectionHelpers.cs
+++ b/src/Lib/MCART/Helpers/CollectionHelpers.cs
@@ -633,6 +633,24 @@ public static IEnumerable<double> ToPercentDouble(this IEnumerable<int> collecti
         return ToPercentDouble(collection, 0, max);
     }
 
+    /// <summary>
+    /// Enumera los elementos de la colección, incluyendo el índice de cada
+    /// elemento devuelto.
+    /// </summary>
+    /// <typeparam name="T">Tipo de elementos de la colección.</typeparam>
+    /// <param name="collection">
+    /// Colección para la cual enumerar los elementos junto con su índice.
+    /// </param>
+    /// <returns>Una enumeración de cada elemento junto a su índice.</returns>
+    public static IEnumerable<(int index, T element)> WithIndex<T>(this IEnumerable<T> collection)
+    {
+        int i = 0;
+        foreach (var j in collection)
+        {
+            yield return (i++, j);
+        }
+    }
+
     /// <summary>
     /// Convierte los valores de una colección de elementos
     /// <see cref="int" /> a porcentajes.
diff --git a/src/Tests/Lib/MCART.Tests/Helpers/CollectionHelpersTests.cs b/src/Tests/Lib/MCART.Tests/Helpers/CollectionHelpersTests.cs
index f248b04f0..a5feb9166 100644
--- a/src/Tests/Lib/MCART.Tests/Helpers/CollectionHelpersTests.cs
+++ b/src/Tests/Lib/MCART.Tests/Helpers/CollectionHelpersTests.cs
@@ -406,6 +406,12 @@ public async Task ToPercentAsync_Test_Double()
         Assert.AreEqual(new[] { 0.2, 0.4, 0.6, 0.8, 1.0, double.NaN }, await Read(GetValuesAsync<double>(double.NaN).ToPercent(0, 5)));
     }
 
+    [Test]
+    public void WithIndex_test()
+    {
+        Assert.That("ABC".ToCharArray().WithIndex(), Is.EquivalentTo(new (int, char)[] { (0,'A'), (1, 'B'), (2, 'C') }));
+    }
+
     private static async IAsyncEnumerable<T> GetValuesAsync<T>(T? tail = null) where T : struct
     {
         yield return (T)Convert.ChangeType(1, typeof(T));