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Frames.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
 
namespace ScratchPadTest
{
    public class Frames
    {
        private readonly Frame[] _frames = new Frame[10];
        private int _currentFrame;

        public void Push(Frame frame)
        {
            _frames[_currentFrame++] = frame;
        }

        public Frame Last { get { return BackFromLast(1); } }

        public Frame BackFromLast(int number)
        {
            return _frames[_currentFrame - number];
        }

        public int Count { get { return _currentFrame; } }
    }
}