http://coderwiki.org/index.php?action=history&feed=atom&title=ArrayArray - Revision history2026-05-19T02:44:53ZRevision history for this page on the wikiMediaWiki 1.44.0http://coderwiki.org/index.php?title=Array&diff=54&oldid=prevDylan: new2025-08-09T13:26:22Z<p>new</p>
<p><b>New page</b></p><div>An '''array''' is simply a ''collection of [[Value|values]]''. They are stored [[Memory layout|next to each other]] in [[memory]] so can be accessed directly using their [[memory address]] (plus an [[Pointer offset|offset]] to get the [[value]] at a specific [[Array index|index]]).<br />
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== Array data types ==<br />
Arrays must contain [[Value|values]] of only one [[data type]].<br />
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For example, this array would be fine as it only contains [[Integer|integers]]:<syntaxhighlight lang="java"><br />
[4, 9, 20, 50, 299]<br />
</syntaxhighlight>However this array would not be, as it contains both [[String|strings]] '''and''' [[Boolean|booleans]]:<syntaxhighlight lang="java"><br />
["hello", "world", true, "Tokyo", false]<br />
</syntaxhighlight>Some [[Dynamic typing|dynamically-typed]] [[programming languages]], such as [[Python]], allow you to have [[Value|values]] of multiple [[Data type|data types]] in a single [[list]]. No [[Static typing|statically typed]] programming language offers this.<br />
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== Common array + collection methods ==<br />
There are some common [[Method|methods]] or [[Field|fields]] you can access on arrays, [[List|lists]] and other [[Collection|collections]] in most programming languages. They may have different names to those listed below, but should be present.<br />
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* [[Collection get|get(index)]] - to get the [[value]] at a specific [[Array index|index]]<br />
* [[Collection set|set(index, value)]] - to set the [[value]] at the specified [[Array index|index]]<br />
* [[Collection append|append(value)]] - to add a value to the end of a [[collection]] (usually only works with [[Dynamic typing|dynamically-typed lists]] as with [[static typing]], [[Array length|array lengths]] are fixed)<br />
* [[Collection length|length]] - to get the number of elements in the [[collection]]</div>Dylan