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AssociationThread[{key1,key2,…}{val1,val2,…}]

gives the association key1val1,key2val2,….

AssociationThread[{key1,key2,…},{val1,val2,…}]

also gives the association key1val1,key2val2,….

Details
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Basic Examples  
Scope  
Properties & Relations  
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AssociationThread

AssociationThread[{key1,key2,…}{val1,val2,…}]

gives the association key1val1,key2val2,….

AssociationThread[{key1,key2,…},{val1,val2,…}]

also gives the association key1val1,key2val2,….

Details

  • If any of the keyi are repeated, later instances replace earlier ones.
  • AssociationThread[keys:>values] yields an association in which every element uses a delayed rule.

Examples

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Basic Examples  (2)

Create an association from a rule of two lists:

Wolfram Language code: AssociationThread[{"one", "two", "three"} -> {1, 2, 3}]

Create an association from two separate lists:

Wolfram Language code: AssociationThread[{🍎, 🍌, 🍓}, {Today, Now, Tomorrow}]

Scope  (1)

Create an association with delayed values:

Wolfram Language code: assoc = AssociationThread[{"date", "temp"} :> {DateString[], AirTemperatureData[]}]

Get the current date and temperature:

Wolfram Language code: Values[assoc ]

Properties & Relations  (2)

Repeated keys replace earlier ones:

Wolfram Language code: AssociationThread[{1, 2, 1} -> {"eins", "two", "one"}]

AssociationThread[list1list2] and AssociationThread[list1,list2] are completely equivalent:

Wolfram Language code: AssociationThread[{1, 2, 3} -> {Yesterday, Today, Tomorrow}] === AssociationThread[{1, 2, 3}, {Yesterday, Today, Tomorrow}]

This is not true if using instead of :

Wolfram Language code: AssociationThread[{1, 2, 3} :> {Yesterday, Today, Tomorrow}] === AssociationThread[{1, 2, 3}, {Yesterday, Today, Tomorrow}]
Wolfram Research (2014), AssociationThread, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationThread.html.

Text

Wolfram Research (2014), AssociationThread, Wolfram Language function, https://reference.wolfram.com/language/ref/AssociationThread.html.

CMS

Wolfram Language. 2014. "AssociationThread." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AssociationThread.html.

APA

Wolfram Language. (2014). AssociationThread. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AssociationThread.html

BibTeX

@misc{reference.wolfram_2026_associationthread, author="Wolfram Research", title="{AssociationThread}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/AssociationThread.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_associationthread, organization={Wolfram Research}, title={AssociationThread}, year={2014}, url={https://reference.wolfram.com/language/ref/AssociationThread.html}, note=[Accessed: 13-June-2026]}