Data_Reverse.cs

using System;
using System.Linq;

namespace CodingChallenges;
[TestClass]
public class Data_Reverse {
    [TestMethod]
    public void Test() {

        /*

        Data Reverse

        A stream of data is received and needs to be reversed.

        Each segment is 8 bits long, meaning the order of these segments needs to be reversed, for example:

        11111111  00000000  00001111  10101010
         (byte1)   (byte2)   (byte3)   (byte4)
        should become:

        10101010  00001111  00000000  11111111
         (byte4)   (byte3)   (byte2)   (byte1)
        The total number of bits will always be a multiple of 8.

        The data is given in an array as such:

        [1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,1,0,1,0,1,0]

        */

        int[] data1 = new int[32] { 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0 };
        int[] data2 = new int[32] { 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 };
        CollectionAssert.AreEqual(data2, DataReverse(data1));

        data1 = new int[16] { 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1 };
        data2 = new int[16] { 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0 };
        CollectionAssert.AreEqual(data2, DataReverse(data1));
    }

    public static int[] DataReverse(int[] data) => data
        .Chunk(8)
        .Reverse()
        .SelectMany(i => i)
        .ToArray();

}