Boo.Lang.Builtins.range C# (CSharp) Метод

        public static IEnumerable<int> range(int begin, int end, int step)
        {
            if (0 ==step)
            {
                throw new ArgumentOutOfRangeException("step == 0");
            }
            if (step < 0)
            {
                if (begin < end)
                {
                    throw new ArgumentOutOfRangeException("begin < end && step < 0");
                }
                for (int i = begin; i > end; i += step) yield return i;
            }
            else
            {
                if (begin > end)
                {
                    throw new ArgumentOutOfRangeException("begin > end && step > 0");
                }
                for (int i = begin; i < end; i += step) yield return i;
            }
        }