Key

Key[key]

represents a key used to access a value in an association.

Key[key][assoc]

extracts the value corresponding to key in the association assoc.

Details

  • Key is used in functions such as Part to access values in Association objects.
  • Key can normally be omitted when key is a string.

Examples

Basic Examples  (4)

Extract a value from an association as a part:

Extract a value from an association by function application:

The Key wrapper is not necessary when the key is a string:

Lookups in associations interoperate with parts in lists and other expressions:

The explicit Key can be omitted when the keys in an association are strings:

Key is normally generated by functions such as Position:

Use Extract to extract the values:

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

Text

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2021_key, author="Wolfram Research", title="{Key}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/Key.html}", note=[Accessed: 18-May-2022 ]}

BibLaTeX

@online{reference.wolfram_2021_key, organization={Wolfram Research}, title={Key}, year={2014}, url={https://reference.wolfram.com/language/ref/Key.html}, note=[Accessed: 18-May-2022 ]}