Return Ref Local

returnRefAndLocal.cs

        static void Main()
        {
            var pers = new int[] { 100, 101, 102, 109 };

            ref var index2 = ref getValue(pers, 2);
            Console.WriteLine($"index 2 before = { index2 } "); // 102

            index2 += 5;
            Console.WriteLine($"index 2 after = { index2 } ");  //107
            Console.WriteLine($"index 2 after = { pers[2] } ");  //107
        }

        static ref int getValue(int[] items, int idx) => ref items[idx];