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

Revision as of 05:50, 28 July 2020

Revision as of 06:34, 28 July 2020

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</syntaxhighlight>

=== [[Mathematica]] and [[Wolfram Language]] ===

[[Mathematica]] usesand [[Wolfram Language]] use the Association expression to represent associative arrays.<ref>{{cite web|url=https://reference.wolfram.com/language/ref/Association.html|title=Association (<-...->)—Wolfram Language Documentation|website=reference.wolfram.com}}</ref> expression to represent associative arrays.

Mathematica uses the Association<ref>{{cite web|url=https://reference.wolfram.com/language/ref/Association.html|title=Association (<-...->)—Wolfram Language Documentation|website=reference.wolfram.com}}</ref> expression to represent associative arrays.

<syntaxhighlight lang="mathematica">

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

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

</syntaxhighlight>

To access:<ref>{{cite web|url=https://reference.wolfram.com/language/ref/Key.html|title=Key—Wolfram Language Documentation|website=reference.wolfram.com}}</ref>

<syntaxhighlight lang="mathematica">

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

</syntaxhighlight>

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

<syntaxhighlight lang="mathematica">

phonebook[["Sally Smart"]]

</syntaxhighlight>

To list keys:<ref>{{cite web|url=https://reference.wolfram.com/language/ref/Keys.html|title=Keys—Wolfram Language Documentation|website=reference.wolfram.com}}</ref> and values<ref>{{cite web|url=https://reference.wolfram.com/language/ref/Values.html|title=Values—Wolfram Language Documentation|website=reference.wolfram.com}}</ref>

Keys[phonebook]