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

Revision as of 20:39, 25 October 2023

Revision as of 21:08, 25 October 2023

Line 8:

The following is a comparison of [[associative array]]s (also "mapping", "hash", and "dictionary") in various programming languages.

===AwkAWK===

[[AwkAWK]] has built-in, language-level support for associative arrays.

For example:

Line 29:

The user can search for elements in an associative array, and delete elements from the array.

The following shows how multi-dimensional associative arrays can be simulated in standard AwkAWK using concatenation and the built-in string-separator variable SUBSEP:

<syntaxhighlight lang=awk>

Line 173:

In C++, the <code>std::map</code> class is [[Generic programming#Templates in C.2B.2B|templated]] which allows the [[data type]]s of keys and values to be different for different <code>map</code> instances. For a given instance of the <code>map</code> class the keys must be of the same base type. The same must be true for all of the values. Although <code>std::map</code> is typically implemented using a [[self-balancing binary search tree]], C++11 defines a second map called <code>[[std::unordered_map]]</code>, which has the algorithmic characteristics of a hash table. This is a common vendor extension to the [[Standard Template Library]] (STL) as well, usually called <code>hash_map</code>, available from such implementations as SGI and STLPort.

===ColdFusion Markup Language===

A structure in [[ColdFusion Markup Language]] (CFML) is equivalent to an associative array:

<syntaxhighlight lang=CFS>

dynamicKeyName = "John Doe";

phoneBook = {

"Sally Smart" = "555-9999",

"#dynamicKeyName#" = "555-4321",

"J. Random Hacker" = "555-1337",

UnknownComic = "???"

};

writeOutput(phoneBook.UnknownComic); // ???

writeDump(phoneBook); // entire struct

</syntaxhighlight>

===Cobra===

Line 212 ⟶ 197:

print "[key]'s phone number is [val]"

}}

===ColdFusion Markup Language===

A structure in [[ColdFusion Markup Language]] (CFML) is equivalent to an associative array:

<syntaxhighlight lang=CFS>

dynamicKeyName = "John Doe";

phoneBook = {

"Sally Smart" = "555-9999",

"#dynamicKeyName#" = "555-4321",

"J. Random Hacker" = "555-1337",

UnknownComic = "???"

};

writeOutput(phoneBook.UnknownComic); // ???

writeDump(phoneBook); // entire struct

</syntaxhighlight>

===D===