Microsoft.JScript.LateBinding.DeleteValueAtIndex C# (CSharp) Method

      internal static bool DeleteValueAtIndex(Object obj, ulong index){
        if (obj is ArrayObject && index < UInt32.MaxValue)
          return ((ArrayObject)obj).DeleteValueAtIndex((uint)index);
        return LateBinding.DeleteMember(obj, index.ToString(CultureInfo.InvariantCulture));
      }

        public static Object unshift(Object thisob, params Object[] args)
        {
            if (args == null || args.Length == 0)
            {
                return(thisob);
            }
            if (thisob is ArrayObject)
            {
                return(((ArrayObject)thisob).Unshift(args));
            }
            uint oldLength = Convert.ToUint32(LateBinding.GetMemberValue(thisob, "length"));
            long newLength = oldLength + args.Length;

            LateBinding.SetMemberValue(thisob, "length", newLength);
            // shift the array
            for (long i = oldLength - 1; i >= 0; i--)
            {
                Object val = LateBinding.GetValueAtIndex(thisob, (ulong)i);
                if (val is Missing)
                {
                    LateBinding.DeleteValueAtIndex(thisob, (ulong)(i + args.Length));
                }
                else
                {
                    LateBinding.SetValueAtIndex(thisob, (ulong)(i + args.Length), val);
                }
            }
            // copy the input args
            for (uint i = 0; i < args.Length; i++)
            {
                LateBinding.SetValueAtIndex(thisob, i, args[i]);
            }
            return(thisob);
        }