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DataStructureQ[ds]

gives True if ds is a valid data structure, and False otherwise.

DataStructureQ[ds,type]

gives True if ds is a valid data structure of the specified type, and False otherwise.

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DataStructureQ

DataStructureQ[ds]

gives True if ds is a valid data structure, and False otherwise.

DataStructureQ[ds,type]

gives True if ds is a valid data structure of the specified type, and False otherwise.

Examples

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Basic Examples  (2)

Create an instance of a DataStructure object:

Wolfram Language code: ds = CreateDataStructure["Stack"]

Test that this is a valid data structure:

Wolfram Language code: DataStructureQ[ds]

An expression with head DataStructure that is not a valid data structure object:

Wolfram Language code: DataStructureQ[DataStructure["MyDynamicArray", {}]]

Scope  (1)

Create an instance of a DataStructure object:

Wolfram Language code: ds = CreateDataStructure["DynamicArray"]

Include a test for the data structure type:

Wolfram Language code: DataStructureQ[ds, "DynamicArray"]

Test that this is not a linked list:

Wolfram Language code: DataStructureQ[ds, "LinkedList"]

Applications  (1)

A simple function that carries out an in-place reverse of a "DynamicArray":

Wolfram Language code: ArrayReverse[ds_] /; DataStructureQ[ds, "DynamicArray"] := Module[{start = 0, end = ds["Length"] + 1}, While[++start < --end, ds["SwapPart", start, end] ]; ds ];

Reverse the elements of a sample dynamic array:

Wolfram Language code: ds = CreateDataStructure["DynamicArray", {9, 2, 7, 0}]; Normal[ArrayReverse[ds]]

The same function will not work on other data structures:

Wolfram Language code: ArrayReverse[CreateDataStructure["ImmutableVector", {9, 2, 7, 0}]]
Wolfram Research (2020), DataStructureQ, Wolfram Language function, https://reference.wolfram.com/language/ref/DataStructureQ.html.

Text

Wolfram Research (2020), DataStructureQ, Wolfram Language function, https://reference.wolfram.com/language/ref/DataStructureQ.html.

CMS

Wolfram Language. 2020. "DataStructureQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DataStructureQ.html.

APA

Wolfram Language. (2020). DataStructureQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DataStructureQ.html

BibTeX

@misc{reference.wolfram_2026_datastructureq, author="Wolfram Research", title="{DataStructureQ}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/DataStructureQ.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_datastructureq, organization={Wolfram Research}, title={DataStructureQ}, year={2020}, url={https://reference.wolfram.com/language/ref/DataStructureQ.html}, note=[Accessed: 13-June-2026]}