Kavita/API/Comparators/ChapterSortComparer.cs

using System.Collections.Generic;

namespace API.Comparators
{
    public class ChapterSortComparer : IComparer<double>
    {
        public int Compare(double x, double y)
        {
            if (x == 0.0 && y == 0.0) return 0;
            // if x is 0, it comes second
            if (x == 0.0) return 1;
            // if y is 0, it comes second
            if (y == 0.0) return -1;

            return x.CompareTo(y);
        }
    }
}