tlang-interperter-cs/tlanglib/TUninit.cs

using Newtonsoft.Json.Linq;

namespace tlang
{
    public class TUninit : TObject
    {
        public override bool AsBoolean {get=>false;}

        public override JToken AsToken()
        {
            return JValue.CreateUndefined();
        }

        public override string ToString()
        {
            return "undefined";
        }
    }
}