List.Map C# (CSharp) Method

  public List<T2> Map<T2> (Fun<T,T2> x)
  {
    return new List<T2>();
  }

        /// <summary>
        /// Returns chunk with duplicate point positions removed.
        /// </summary>
        public Chunk ImmutableDeduplicate()
        {
            if (!HasPositions)
            {
                return(this);
            }

            var dedup = new HashSet <V3d>();
            var ia    = new List <int>();

            for (var i = 0; i < Count; i++)
            {
                if (dedup.Add(Positions[i]))
                {
                    ia.Add(i);
                }
            }
            var hasDuplicates = ia.Count < Count;

            if (hasDuplicates)
            {
                var self = this;
                var ps   = HasPositions ? ia.Map(i => self.Positions[i]) : null;
                var cs   = HasColors ? ia.Map(i => self.Colors[i]) : null;
                var ns   = HasNormals ? ia.Map(i => self.Normals[i]) : null;
                var js   = HasIntensities ? ia.Map(i => self.Intensities[i]) : null;
                return(new Chunk(ps, cs, ns, js));
            }
            else
            {
                return(this);
            }
        }