1namespace utility
 2{
 3  using System;
 4  using System.Linq;
 5  using System.Collections.Generic;
 6
 7  public static class Iterating
 8  {
 9    public static void Each<T>(this IEnumerable<T> items, Action<T> visitor)
10    {
11      foreach (var item in items ?? Enumerable.Empty<T>()) visitor(item);
12    }
13  }
14}