using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Iterator
{
    internal class CommonIterator : IIterator
    {
        private object[] collection;
        private int index;

        public CommonIterator(object[] collection)
        {
            this.collection = collection;
            this.index = -1;
        }

        public bool HasNext { get { return index + 1 < collection.Length; } }

        public object Next()
        {
            if (HasNext)
            {
                index++;
                return collection[index];
            }
            else
            {
                return null;
            }
        }
    }
}