DataStructureQ

DataStructureQ[ds] yields True if ds is a valid data structure and False otherwise.

DataStructureQ[ds, type] yields True if ds is a valid data structure of the specified type and False otherwise.

Examples

Check if something is a data structure:

ds = CreateDataStructure["Stack"];
DataStructureQ[ds]
(* True *)

Please visit the official Wolfram Language Reference for more details.