diff --git a/src/Extensions.cs b/src/Extensions.cs
new file mode 100644
index 0000000..0e5cbd4
--- /dev/null
+++ b/src/Extensions.cs
@@ -0,0 +1,12 @@
+namespace aoc2021;
+
+internal static class Extensions
+{
+    public static void ForEach<T>(this IEnumerable<T> enumeration, Action<T> action)
+    {
+        foreach (T item in enumeration)
+        {
+            action(item);
+        }
+    }
+}