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

namespace Plane.Collections
{
    public static class EnumerableExtensions
    {
        public static void ForEach<T>(this IEnumerable items, Action<T> action)
        {
            if (items == null)
            {
                throw new ArgumentNullException(nameof(items));
            }
            if (action == null)
            {
                throw new ArgumentNullException(nameof(action));
            }
            foreach (T item in items)
            {
                action(item);
            }
        }

        public static void ForEach<T>(this IEnumerable<T> items, Action<T> action)
        {
            if (items == null)
            {
                throw new ArgumentNullException(nameof(items));
            }
            if (action == null)
            {
                throw new ArgumentNullException(nameof(action));
            }
            foreach (var item in items)
            {
                action(item);
            }
        }

        public static string JoinToString(this IEnumerable<string> items, string separator)
        {
            if (items == null)
            {
                throw new ArgumentNullException(nameof(items));
            }
            return string.Join(separator, items);
        }

        public static string JoinToString<T>(this IEnumerable<T> items, string separator)
        {
            if (items == null)
            {
                throw new ArgumentNullException(nameof(items));
            }
            return string.Join(separator, items);
        }
    }
}