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              <h1 id="firstHeading" class="firstHeading mw-first-heading"><span lang="sv" dir="ltr"><span class="mw-page-title-main">Lua</span></span></h1>
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              <div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="sv" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="sv" dir="ltr" data-mw-parsoid-version="0.24.0.0-alpha14" data-mw-html-version="2.8.0"><section data-mw-section-id="0" id="mwAQ"><dl class="noexcerpt dablink" typeof="mw:Transclusion" id="mwAg"><dd><i>För andra betydelser, se <a rel="mw:WikiLink" href="Lua_(olika_betydelser)" title="Lua (olika betydelser)" class="mw-disambig">Lua (olika betydelser)</a>.</i></dd></dl>
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</style></span><table class="infobox " style="border-spacing:3px; " id="mwBA"><tbody><tr><td colspan="2" class="" style="padding:2px; text-align:center; font-size: 125%; font-weight: bold; ">Lua</td></tr><tr><td colspan="2" class="" style="text-align:center; "> <span typeof="mw:File"><img alt="Lua-Logo.svg" src="./_assets_/0c70a452f799bfe840676ee341124611/Lua-Logo.svg.png" decoding="async" data-file-width="947" data-file-height="947" data-file-type="drawing" height="200" width="200" class="mw-file-element" loading="lazy"></span> </td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Programmeringsparadigm" title="Programmeringsparadigm">Paradigm</a></th><td class="" style=""><a rel="mw:WikiLink" href="Programmeringsparadigm" title="Programmeringsparadigm">multi-paradigm</a>: <a rel="mw:WikiLink" href="Imperativ_programmering" title="Imperativ programmering">imperativ</a> (<a rel="mw:WikiLink" href="Procedurell_programmering" title="Procedurell programmering">procedurell</a>, prototyp-baserad, <a rel="mw:WikiLink" href="Objektorienterad_programmering" title="Objektorienterad programmering">objektorienterad</a>), <a rel="mw:WikiLink" href="Funktionell_programmering" title="Funktionell programmering">funktionell</a></td></tr><tr><th style="text-align:left; ">Gavs ut</th><td class="" style="">1993</td></tr><tr><th style="text-align:left; ">Skapat av</th><td class="" style="">Roberto Ierusalimschy, Waldemar Celes, Luiz Henrique de Figueiredo</td></tr><tr><th style="text-align:left; ">Senaste version</th><td class="" style="">5.4.8 (2025-06-04)</td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Typsystem" title="Typsystem">Datatypsdisciplin</a></th><td class="" style="">strong, duck, dynamic</td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Implementation_(programmering)" title="Implementation (programmering)">Implementationer</a></th><td class="" style="">Lua, LuaJIT, LLVM-Lua, Lua Alchemy</td></tr><tr><th style="text-align:left; ">Dialekter</th><td class="" style="">Metalua, Idle, GSL Shell</td></tr><tr><th style="text-align:left; ">Influerat av</th><td class="" style=""><a rel="mw:WikiLink" href="C%2B%2B" title="C++">C++</a>, CLU, <a rel="mw:WikiLink" href="Modula" title="Modula">Modula</a>, <a rel="mw:WikiLink" href="Scheme" title="Scheme">Scheme</a>, SNOBOL</td></tr><tr><th style="text-align:left; ">Influerat</th><td class="" style="">Io, GameMonkey, Squirrel, Falcon, MiniD, Julia</td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Operativsystem" title="Operativsystem">Plattform</a></th><td class="" style=""><a rel="mw:WikiLink" href="Multiplattform" title="Multiplattform">multiplattform</a></td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Programvarulicens" title="Programvarulicens">Licens</a></th><td class="" style=""><a rel="mw:WikiLink" href="MIT-licens" title="MIT-licens">MIT-licens</a></td></tr><tr><th style="text-align:left; "><a rel="mw:WikiLink" href="Webbplats" title="Webbplats">Webbplats</a></th><td class="" style=""><a rel="mw:ExtLink nofollow" href="http://www.lua.org/" class="external text">www.lua.org</a></td></tr>
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<p id="mwBg"><b id="mwBw">Lua</b> är ett lättviktigt, reflektivt, <a rel="mw:WikiLink" href="Procedurell_programmering" title="Procedurell programmering" id="mwCA">procedurellt</a> och <a rel="mw:WikiLink" href="Imperativ_programmering" title="Imperativ programmering" id="mwCQ">imperativt</a> <a rel="mw:WikiLink" href="Programspr%C3%A5k" title="Programspråk" id="mwCg">programspråk</a>, designat som ett <a rel="mw:WikiLink" href="Skriptspr%C3%A5k" title="Skriptspråk" id="mwCw">skriptspråk</a> med utökningsbar <a rel="mw:WikiLink" href="Semantik" title="Semantik" id="mwDA">semantik</a> som primärt mål.</p>

</section><section data-mw-section-id="1" id="mwDg" aria-labelledby="Historia"><div class="mw-heading mw-heading2"><h2 id="Historia">Historia</h2></div>
<p id="mwDw">Lua skapades 1993 av Roberto Ierusalimschy, Luiz Henrique de Figueiredo, och Waldemar Celes, medlemmar i Computer Graphics Technology Group vid Pontifícia Universidade Católica do Rio de Janeiro i <a rel="mw:WikiLink" href="Rio_de_Janeiro" title="Rio de Janeiro" id="mwFA">Rio de Janeiro</a>.</p>

</section><section data-mw-section-id="2" id="mwFQ" aria-labelledby="Utmärkande_drag"><div class="mw-heading mw-heading2"><h2 id="Utmärkande_drag"><span id="Utm.C3.A4rkande_drag" typeof="mw:FallbackId"></span>Utmärkande drag</h2></div>
<p id="mwFg">Lua är <a rel="mw:WikiLink" href="Typsystem#Dynamisk_typning" title="Typsystem" id="mwFw">dynamiskt typat</a> och kör program genom att <a rel="mw:WikiLink" href="Interpretator" title="Interpretator" id="mwGA">tolka</a> <a rel="mw:WikiLink" href="Bytekod" title="Bytekod" id="mwGQ">bytekod</a> i en <a rel="mw:WikiLink" href="Processorregister" title="Processorregister" id="mwGg">registerbaserad</a> <a rel="mw:WikiLink" href="Virtuell_maskin" title="Virtuell maskin" id="mwGw">virtuell maskin</a>. Det har automatisk minneshantering med stegvis (försvenskat uttryck <i id="mwHA">inkrementell</i>) <a rel="mw:WikiLink" href="Skr%C3%A4psamling" title="Skräpsamling" id="mwHQ">skräpsamling</a>.</p>

<p id="mwHg">Språket är särskilt väl anpassat för konfigurering och <a rel="mw:WikiLink" href="Skriptspr%C3%A5k" title="Skriptspråk" id="mwHw">skriptning</a>. Det är snabbt i jämförelse med andra interpreterade skriptspråk och ganska litet. Det är också väldigt enkelt att lära sig och skriva enkla skript med, däremot inte lika passande för större skript.</p>

<p id="mwIA">Källkoden till version 5.2.2 består av ca 20 000 rader <a rel="mw:WikiLink" href="C_(programspr%C3%A5k)" title="C (programspråk)" id="mwIQ">C</a>-kod vilket motsvarar ca 180 kB i <a rel="mw:WikiLink" href="Linux" title="Linux" id="mwIg">Linux</a>. Det är gjort för att lätt kunna byggas in i olika applikationer.</p>

<p id="mwIw">Lua är i grunden inte ett <a rel="mw:WikiLink" href="Objektorienterad_programmering" title="Objektorienterad programmering" id="mwJA">objektorienterat</a> språk, men det tillhandahåller mekanismer för att implementera klasser och arv direkt i språket. Dess enda inbyggda <a rel="mw:WikiLink" href="Datastruktur" title="Datastruktur" id="mwJQ">datastruktur</a> är <i id="mwJg">table</i> som i grunden är en <a rel="mw:WikiLink" href="Hashtabell" title="Hashtabell" id="mwJw">hashtabell</a>. Denna kan även användas som <a rel="mw:WikiLink" href="F%C3%A4lt_(datastruktur)" title="Fält (datastruktur)" id="mwKA">fält</a>, lista, mängd och <a rel="mw:WikiLink" href="Tupel" title="Tupel" id="mwKw">tupel</a>.<sup class="mw-ref reference" id="cite_ref-1" rel="dc:references" typeof="mw:Extension/ref"><a href="#cite_note-1" id="mwLA"><span class="mw-reflink-text" id="mwLQ"><span class="cite-bracket" id="mwLg">[</span>1<span class="cite-bracket" id="mwLw">]</span></span></a></sup></p>

<section data-mw-section-id="3" id="mwMA" aria-labelledby="Exempelkod"><div class="mw-heading mw-heading3"><h3 id="Exempelkod">Exempelkod</h3></div>
<p id="mwMQ">Det klassiska <a rel="mw:WikiLink" href="Hello_World" title="Hello World" id="mwMg">"Hello, World!"-programmet</a> skrivs enligt följande:</p>
<div class="mw-highlight mw-highlight-lang-lua mw-content-ltr" dir="ltr" typeof="mw:Extension/syntaxhighlight" id="mwMw"><pre id="mwNA"><span id="mwNQ"></span><span class="nb" id="mwNg">print</span><span class="p" id="mwNw">(</span><span class="s1" id="mwOA">'Hello, World!'</span><span class="p" id="mwOQ">)</span>
</pre></div>
<p id="mwOg">Här är ett annat exempel:</p>
<div class="mw-highlight mw-highlight-lang-lua mw-content-ltr" dir="ltr" typeof="mw:Extension/syntaxhighlight" id="mwOw"><pre id="mwPA"><span id="mwPQ"></span><span class="nb" id="mwPg">print</span><span class="p" id="mwPw">(</span><span class="s1" id="mwQA">'Wikipedia är bra'</span><span class="p" id="mwQQ">)</span>
</pre></div>

<p id="mwQg"><a rel="mw:WikiLink" href="Kodkommentar" title="Kodkommentar" id="mwQw">Kommentarer</a> skrivs enligt följande syntax, liknande <a rel="mw:WikiLink" href="Ada_(programspr%C3%A5k)" title="Ada (programspråk)" id="mwRA">Ada</a>, <a rel="mw:WikiLink" href="Haskell_(programspr%C3%A5k)" title="Haskell (programspråk)" id="mwRQ">Haskell</a>, <a rel="mw:WikiLink" href="SQL" title="SQL" class="mw-redirect" id="mwRg">SQL</a> och <a rel="mw:WikiLink" href="VHDL" title="VHDL" id="mwRw">VHDL</a>:</p>
<div class="mw-highlight mw-highlight-lang-lua mw-content-ltr" dir="ltr" typeof="mw:Extension/syntaxhighlight" id="mwSA"><pre id="mwSQ"><span id="mwSg"></span><span class="c1" id="mwSw">-- A comment in Lua starts with a double-hyphen and runs to the end of the line.</span>

<span class="cm" id="mwTA">--[[ Multi-line strings &amp; comments</span>
<span class="cm" id="mwTQ">     are adorned with double square brackets. ]]</span>

<span class="cm" id="mwTg">--[=[ Comments like this can have other --[[comments]] nested. ]=]</span>
</pre></div>

<p id="mwTw"><a rel="mw:WikiLink" href="Fakultet_(matematik)" title="Fakultet (matematik)" id="mwUA">Fakultet</a>-funktionen kan skrivas enligt följande:</p>
<div class="mw-highlight mw-highlight-lang-lua mw-content-ltr mw-highlight-lines mw-highlight-copy" dir="ltr" typeof="mw:Extension/syntaxhighlight" id="mwUQ"><pre id="mwUg"><span id="mwUw"></span><span class="hll" id="mwVA"><span class="linenos" data-line="1" id="mwVQ"></span><span class="kd" id="mwVg">local</span><span class="w" id="mwVw"> </span><span class="kr" id="mwWA">function</span><span class="w" id="mwWQ"> </span><span class="nf" id="mwWg">factorial</span><span class="p" id="mwWw">(</span><span class="nv" id="mwXA">nbr</span><span class="p" id="mwXQ">)</span><span class="w" id="mwXg"> </span><span class="c1" id="mwXw">-- inparametern nbr är ett heltal</span>
</span><span class="linenos" data-line="2" id="mwYA"></span><span class="w" id="mwYQ">    </span><span class="kd" id="mwYg">local</span><span class="w" id="mwYw"> </span><span class="nv" id="mwZA">res</span><span class="w" id="mwZQ"> </span><span class="o" id="mwZg">=</span><span class="w" id="mwZw"> </span><span class="mi" id="mwaA">1</span><span class="w" id="mwaQ"> </span><span class="c1" id="mwag">-- initiera lokal variabel res till 1</span>
<span class="linenos" data-line="3" id="mwaw"></span><span class="w" id="mwbA">    </span><span class="kr" id="mwbQ">for</span><span class="w" id="mwbg"> </span><span class="nv" id="mwbw">idx</span><span class="w" id="mwcA"> </span><span class="o" id="mwcQ">=</span><span class="w" id="mwcg"> </span><span class="mi" id="mwcw">2</span><span class="p" id="mwdA">,</span><span class="w" id="mwdQ"> </span><span class="nv" id="mwdg">nbr</span><span class="w" id="mwdw"> </span><span class="kr" id="mweA">do</span><span class="w" id="mweQ"> </span><span class="c1" id="mweg">-- för index 2 till nbr</span>
<span class="linenos" data-line="4" id="mwew"></span><span class="w" id="mwfA">        </span><span class="nv" id="mwfQ">res</span><span class="w" id="mwfg"> </span><span class="o" id="mwfw">=</span><span class="w" id="mwgA"> </span><span class="nv" id="mwgQ">res</span><span class="w" id="mwgg"> </span><span class="o" id="mwgw">*</span><span class="w" id="mwhA"> </span><span class="nv" id="mwhQ">idx</span>
<span class="linenos" data-line="5" id="mwhg"></span><span class="w" id="mwhw">    </span><span class="kr" id="mwiA">end</span>
<span class="linenos" data-line="6" id="mwiQ"></span><span class="w" id="mwig">    </span><span class="kr" id="mwiw">return</span><span class="w" id="mwjA"> </span><span class="nv" id="mwjQ">res</span><span class="w" id="mwjg"> </span><span class="c1" id="mwjw">-- returnerar nbr!</span>
<span class="linenos" data-line="7" id="mwkA"></span><span class="kr" id="mwkQ">end</span>
<span class="linenos" data-line="8" id="mwkg"></span><span class="nb" id="mwkw">print</span><span class="p" id="mwlA">(</span><span class="nf" id="mwlQ">factorial</span><span class="p" id="mwlg">(</span><span class="mi" id="mwlw">5</span><span class="p" id="mwmA">))</span><span class="w" id="mwmQ"> </span><span class="c1" id="mwmg">-- 5! = 120</span>
</pre></div>

</section></section><section data-mw-section-id="4" id="mwmw" aria-labelledby="Källor"><div class="mw-heading mw-heading2"><h2 id="Källor"><span id="K.C3.A4llor" typeof="mw:FallbackId"></span>Källor</h2></div>
<div class="mw-references-wrap" typeof="mw:Extension/references" id="mwnA"><ol class="mw-references references" id="mwnQ"><li id="cite_note-1" data-mw-footnote-number="1"><span class="mw-cite-backlink" id="mwng"><a href="#cite_ref-1" rel="mw:referencedBy" id="mwnw"><span class="mw-linkback-text" id="mwoA">↑</span></a></span> <span id="mw-reference-text-cite_note-1" class="mw-reference-text reference-text"><style data-mw-deduplicate="TemplateStyles:r58662249" typeof="mw:Extension/templatestyles mw:Transclusion" id="mwoQ">
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@media screen,handheld,projection{.mw-parser-output cite .printonly{display:none}}


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</style><cite style="font-style:normal" class="web" id="mwog"><a rel="mw:ExtLink nofollow" href="http://www.lua.org/about.html" class="external text" id="mwow">”Lua: about”</a><span class="printonly" id="mwpA">. <a rel="mw:ExtLink nofollow" href="http://www.lua.org/about.html" class="external free" id="mwpQ">http://www.lua.org/about.html</a></span><span class="reference-accessdate" id="mwpg">.<span typeof="mw:Entity" id="mwpw"> </span>Läst 11 juli 2013</span>.</cite><span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.btitle=Lua%3A+about&amp;rft.atitle=&amp;rft_id=http%3A%2F%2Fwww.lua.org%2Fabout.html&amp;rfr_id=info:sid/en.wikipedia.org:Lua" id="mwqA"><span style="display: none;" id="mwqQ"><span typeof="mw:Entity" id="mwqg">&nbsp;</span></span></span></span></li>
</ol></div>

</section><section data-mw-section-id="5" id="mwqw" aria-labelledby="Externa_länkar"><div class="mw-heading mw-heading2"><h2 id="Externa_länkar"><span id="Externa_l.C3.A4nkar" typeof="mw:FallbackId"></span>Externa länkar</h2></div>
<ul id="mwrA"><li id="mwrQ"><a rel="mw:ExtLink nofollow" href="http://www.lua.org/" class="external text" id="mwrg">Officiell webbplats</a></li>
<li id="mwrw"><a rel="mw:ExtLink nofollow" href="http://www.lua.org/history.html" class="external text" id="mwsA">Historia</a></li></ul>


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