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

Revision as of 10:02, 25 June 2008

Revision as of 10:04, 25 June 2008

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=== Optimj ===

The [http://www.ateji.com/optimj.html Optimj] programming language is an extension of the Java programming5. languageAs java, Optimj provides maps. ItBut, OptimJ also includesprovides true associative arrays.: Forjava example,arrays anare associativeindexed arraywith mapping0-based stringsintegers; toassociative stringsarrays mightare beindexed specifiedwith asany follows:collection of keys.

<source lang="java">

String[String] phoneBook = {

"Sally Smart" -> "555-9999",

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

"J. Random Hacker" -> "555553-1337"

};

</source>

// String[String] is not a java type but an optimj type:

<source lang="java">

denotes an// associative array of strings indexed by strings.

String[String]

</source>

denotes an associative array of strings indexed by strings.

// iterate over the values

<source lang="java">

for(String number : phoneBook[key]) {

System.out.println(number);

</source>

}

access a value by a key. For example, you can interate over values with the following code:

// The previous statement prints: "555-9999", "555-1212", "553-1337"

<source lang="java">

// iterate over the keys

for(String name : phoneBook.keys) {

System.out.println(name + " -> " + phoneBook[name]);

}

// phoneBook[name] acces a value by a key (it looks like java array acces)

// i.e. phoneBook["John Doe"] returns "555-1212"

</source>

Of course, it is possible to define multi-dimensional arrays, to mix java array and associative arrays, to mix maps and associative arrays.

In fact, associative arrays mimics as soon as possible java arrays.

<source lang="java">

int[String][][double] a;

java.util.Map<String[Object], Integer> b;

</source>

=== Perl ===