Comparison of programming languages (associative array): Difference between revisions

Revision as of 05:28, 22 January 2016

Revision as of 05:29, 22 January 2016

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Mathematica uses the Association<ref>https://reference.wolfram.com/language/ref/Association.html</ref> expression to represent associative arrays.

<source lang="mathematica">

phonebook = <| "Sally Smart" -> "555-9999",

"John Doe" -> "555-1212",

"J. Random Hacker" -> "553-1337" |>;

</source>

To access<ref>https://reference.wolfram.com/language/ref/Key.html</ref>

<source lang="mathematica">

phonebook[[Key["Sally Smart"]]]

</source>

If the keys are strings, the ''Key'' keyword is not necessary, so:

<source lang="mathematica">

phonebook<nowiki>[["Sally Smart"]]
</nowikisource>

To list keys<ref>https://reference.wolfram.com/language/ref/Keys.html</ref> and values<ref>https://reference.wolfram.com/language/ref/Values.html</ref>