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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Asynchronous module definition</span></span>
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<p><b>Asynchronous module definition</b> (<b>AMD</b>) is a <a href="Specification_(technical_standard)" title="Specification (technical standard)">specification</a> for the programming language <a href="JavaScript" title="JavaScript">JavaScript</a>. It defines an <a href="Application_programming_interface" class="mw-redirect" title="Application programming interface">application programming interface</a> (API) that defines <a href="Modular_programming" title="Modular programming">code modules</a> and their <a href="Coupling_(computer_programming)" title="Coupling (computer programming)">dependencies</a>, and loads them asynchronously if desired. Implementations of AMD provide the following benefits:
</p>
<ul><li>Website performance improvements. AMD implementations load smaller JavaScript files, and then only when they are needed.</li>
<li>Fewer page errors. AMD implementations allow developers to define dependencies that must load before a module is executed, so the module does not try to use outside code that is not available yet.</li></ul>
<p>In addition to loading multiple JavaScript files at runtime, AMD implementations allow developers to encapsulate code in smaller, more logically-organized files, in a way similar to other programming languages such as <a href="Java_(programming_language)" title="Java (programming language)">Java</a>. For production and deployment, developers can <a href="Concatenation" title="Concatenation">concatenate</a> and <a href="Minification_(programming)" title="Minification (programming)">minify</a> JavaScript modules based on an AMD API into one file, the same as traditional JavaScript.
</p><p>AMD provides some <a href="CommonJS" title="CommonJS">CommonJS</a> interoperability. It allows for using a similar <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">exports</code> and <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">require()</code> interface in the code, although its own <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">define()</code> interface is more basal and preferred.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>The AMD specification is implemented by <a href="Dojo_Toolkit" title="Dojo Toolkit">Dojo Toolkit</a>, RequireJS, and other libraries.
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/amdjs/amdjs-api">"AMD specification"</a>. <i>GitHub</i>. Group for AMD JS Module API. 28 October 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">28 October</span> 2019</span>.</cite></span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://github.com/amdjs/amdjs-api">Official website</a></span></span></li>
<li><a rel="nofollow" class="external text" href="http://requirejs.org/docs/whyamd.html">Why AMD? (Require.js)</a></li>
<li><a rel="nofollow" class="external text" href="http://dojotoolkit.org/documentation/tutorials/1.10/modules/">Dojo Introduction to AMD</a></li>
<li><a rel="nofollow" class="external text" href="http://addyosmani.com/writing-modular-js/">Writing Modular JavaScript With AMD, CommonJS & ES Harmony</a></li></ul>
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</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><span class="noviewer" typeof="mw:File"><span title="List-Class article"></span></span> <b>Lists</b>: <a href="List_of_JavaScript_libraries" title="List of JavaScript libraries">JavaScript libraries</a> • <a href="List_of_Ajax_frameworks#JavaScript" title="List of Ajax frameworks">Ajax frameworks</a> • <a href="List_of_server-side_JavaScript_implementations" title="List of server-side JavaScript implementations">Server-side JavaScript</a><br><span class="noviewer" typeof="mw:File"><span title="List-Class article"></span></span> <b>Comparison</b>: <a href="Comparison_of_JavaScript-based_web_frameworks" title="Comparison of JavaScript-based web frameworks">JavaScript web frameworks</a></div></td></tr></tbody></table></div></div><!--htdig_noindex--><div><div class="zim-footer">
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