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AssociationQ

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AssociationQ[expr]

gives True if expr is a valid Association object, and False otherwise.

Examples

Basic Examples  (2)Summary of the most common use cases

Association constructed from rules yields a valid object:

In[1]:=1
✖
https://wolfram.com/xid/0i1pir233-edf1xx
Out[1]=1

Valid Association object allows extraction of values given keys:

In[2]:=2
✖
https://wolfram.com/xid/0i1pir233-ddbp6q
Out[2]=2

If arguments are not rules, Association remains unevaluated:

In[1]:=1
✖
https://wolfram.com/xid/0i1pir233-fstu4c
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0i1pir233-iu35so
Out[2]=2

Association that is not valid has no special properties:

In[3]:=3
✖
https://wolfram.com/xid/0i1pir233-krlb6s
Out[3]=3
Wolfram Research (2015), AssociationQ, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationQ.html.
✖
Wolfram Research (2015), AssociationQ, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationQ.html.

Text

Wolfram Research (2015), AssociationQ, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationQ.html.

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Wolfram Research (2015), AssociationQ, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationQ.html.

CMS

Wolfram Language. 2015. "AssociationQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AssociationQ.html.

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Wolfram Language. 2015. "AssociationQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AssociationQ.html.

APA

Wolfram Language. (2015). AssociationQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AssociationQ.html

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Wolfram Language. (2015). AssociationQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AssociationQ.html

BibTeX

@misc{reference.wolfram_2025_associationq, author="Wolfram Research", title="{AssociationQ}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/AssociationQ.html}", note=[Accessed: 25-May-2025 ]}

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@misc{reference.wolfram_2025_associationq, author="Wolfram Research", title="{AssociationQ}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/AssociationQ.html}", note=[Accessed: 25-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_associationq, organization={Wolfram Research}, title={AssociationQ}, year={2015}, url={https://reference.wolfram.com/language/ref/AssociationQ.html}, note=[Accessed: 25-May-2025 ]}

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@online{reference.wolfram_2025_associationq, organization={Wolfram Research}, title={AssociationQ}, year={2015}, url={https://reference.wolfram.com/language/ref/AssociationQ.html}, note=[Accessed: 25-May-2025 ]}