Generic BubbleSort Extension

Question

    public static T[] BubbleSort(this T[] arr) where T : class
    {
        for (int i = 0; i < arr.Length; i++)
        {
            for (int j = 0; j <         


        

Answer 1

You can restrict T to IComparable like this:

public static void BubbleSort(this T[] arr) where T : IComparable
{
    for (int i = 0; i < arr.Length; i++)
    {
        for (int j = 0; j < arr.Length-1; j++)
        {
            if (arr[j].CompareTo(arr[j + 1]) > 0)
                swap(arr[j], arr[j + 1]);
        }
    }
}

which has the advantage that T can also be a value type like int. Also your function does not need to return the array as it changes the this array.