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ListQ[expr]

gives True if the head of expr is List, and False otherwise.

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ListQ

ListQ[expr]

gives True if the head of expr is List, and False otherwise.

Examples

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Basic Examples  (2)

ListQ gives True when the head of an expression is List:

Wolfram Language code: ListQ[{a, b, c}]
Wolfram Language code: Head[{a, b, c}]

ListQ gives False when the head of an expression is not List:

Wolfram Language code: ListQ[h[a, b, c]]
Wolfram Language code: Head[h[a, b, c]]

ListQ gives False on other array representations:

Wolfram Language code: ListQ[SparseArray[{{1, 0}, {0, 1}}]]
Wolfram Language code: ListQ[QuantityArray[{10, 30}, "Meters"]]

Properties & Relations  (3)

ListQ is equivalent to MatchQ[#,_List]&:

Wolfram Language code: listQ = MatchQ[#, _List]&;
Wolfram Language code: {ListQ[{a}], listQ[{a}]}
Wolfram Language code: {ListQ[f[1, 2]], listQ[f[1, 2]]}
Wolfram Language code: {ListQ[SparseArray[{0, 0, 1, 0}]], listQ[SparseArray[{0, 0, 1, 0}]]}

VectorQ returns True for other 1D array representations:

Wolfram Language code: With[{vector = SparseArray[{0, 0, 1, 0}]}, {ListQ[vector], VectorQ[vector]}]
Wolfram Language code: With[{vector = QuantityArray[{20, 50}, "Meters"]}, {ListQ[vector], VectorQ[vector]}]

ListQ[list] is not affected by deeper levels of List:

Wolfram Language code: ListQ[{a, {b}}]

VectorQ[list] does not accept deeper levels of List:

Wolfram Language code: VectorQ[{a, {b}}]
Wolfram Research (1991), ListQ, Wolfram Language function, https://reference.wolfram.com/language/ref/ListQ.html.

Text

Wolfram Research (1991), ListQ, Wolfram Language function, https://reference.wolfram.com/language/ref/ListQ.html.

CMS

Wolfram Language. 1991. "ListQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ListQ.html.

APA

Wolfram Language. (1991). ListQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ListQ.html

BibTeX

@misc{reference.wolfram_2026_listq, author="Wolfram Research", title="{ListQ}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/ListQ.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_listq, organization={Wolfram Research}, title={ListQ}, year={1991}, url={https://reference.wolfram.com/language/ref/ListQ.html}, note=[Accessed: 12-June-2026]}