using System;
using System.Collections.Generic;
using System.Linq;

namespace EachExtensionExample
{
    public static class EachIteratorExtension
    {
        public static void Each<TSource>(this IEnumerable<TSource> source, Action<TSource> iterator)
        {
            foreach (TSource item in source) iterator(item);
        }
    }

    internal class Program
    {
        private static void Main()
        {
            string[] collection = { "Hello", "World" };
            collection.Each(item => Console.WriteLine(item));

            Console.WriteLine();

            //of meerdere lijnen
            collection.Each(item =>
            {
                Console.WriteLine(item);
                Console.WriteLine(item.ToUpper());
            });

            Console.WriteLine();

            //maar hetzelfde werkt met zowat alle .NET collecties
            //enige vereiste is dat ze IEnumerable implementeren
            var dates = new List<DateTime>();
            Enumerable.Range(0, 7).Each(day => dates.Add(DateTime.Now.AddDays(day)));
            dates.Each(d => Console.WriteLine(d.DayOfWeek));

            var dates2 = new List<DateTime>() { DateTime.Now };
            var nestedList = new List<List<DateTime>> { dates, dates2 };
            nestedList.Each(list =>
                Console.WriteLine("Dates in list: {0}", list.Count)
                );

            Console.ReadLine();
        }
    }
}