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</style><div role="note" class="hatnote navigation-not-searchable">This article is about physics simulation environment. For embedded JavaScript, see <a href="JavaScript" title="JavaScript">JavaScript</a>.</div>
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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above summary">Web Easy JavaScript Simulation, old name Easy JavaScript Simulations. Old name Easy Java Simulations</th></tr><tr><td colspan="2" class="infobox-image logo"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data">Francisco Esquembre</td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">5.1
</div></td></tr><tr style="display:none"><td colspan="2">
</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data">Java, JavaScript since 2014</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a>, <a href="Linux" title="Linux">Linux</a>, <a href="Unix" title="Unix">Unix</a>, <a href="Mac_OS" class="mw-redirect" title="Mac OS">Mac OS</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="File_size" title="File size">Size</a></th><td class="infobox-data">23 MB</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data">Scientific Software, <a href="Mathematical_software" title="Mathematical software">Mathematical software</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="GNU_GPL_license" class="mw-redirect" title="GNU GPL license">GNU GPL license</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://www.um.es/fem/EjsWiki/index.php/Main/WhatIsEJS">www<wbr>.um<wbr>.es<wbr>/fem<wbr>/EjsWiki<wbr>/index<wbr>.php<wbr>/Main<wbr>/WhatIsEJS</a></span></td></tr></tbody></table>
<p><b>Web Easy JavaScript Simulation </b>, <b>Easy JavaScript Simulations (EJSS)</b>, formerly known as <b>Easy Java Simulations (EJS)</b>, is an <a href="Open-source_software" title="Open-source software">open-source software</a> tool, part of the <a href="Open_Source_Physics" title="Open Source Physics">Open Source Physics</a> project, designed to create discrete computer simulations.
</p><p>A discrete <a href="Computer_simulation" title="Computer simulation">computer simulation</a>, or simply a computer simulation, is a computer program that tries to reproduce, for pedagogical or scientific purposes, a natural phenomenon through the visualization of the different states that it can have. Each of these states is described by a set of variables that change in time due to the iteration of a given algorithm.
</p><p>In creating a simulation with the help of EJSS, the user does not program the simulation at the level of writing code, instead the user is working at a higher conceptual level, declaring and organizing the equations and other mathematical expressions that operate the simulation. EJSS handles the technical aspects of coding the simulation in the Java programming language, thus freeing the user to concentrate on the simulation's content.
</p><p>The generated Java or JavaScript code can, in terms of efficiency and sophistication, be taken as the creation of a professional programmer.
</p><p>EJSS is written in the Java programming language and the created simulations are in Java or JavaScript. <a href="Java_Virtual_Machine" class="mw-redirect" title="Java Virtual Machine">Java Virtual Machines</a> (JVM) are available for many different platforms; a platform for which a JVM is available can run Java programs. Though Java applets were popular before 2014, JavaScript Applets outputs can be run on almost any device now, including Android and iOS.
</p><p>EJSS has its own format for storing the simulations, which is based on XML, EJS and EJSS and carries the extension .xml, .ejs and .ejss. It contains not only the code for the simulation, but also the rest of the things, like the html introduction.
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<ul><li><i>Wolfgang Christian</i> and <i>Francisco Esquembre</i>, <a rel="nofollow" class="external text" href="http://scitation.aip.org/journals/doc/PHTEAH-ft/vol_45/iss_8/475_1.html">Modeling Physics with Easy Java Simulations</a> The Physics Teacher, Volume 45, Issue 8, November 2007, pp. 468–528</li>
<li><i>Francisco Esquembre</i>, "Easy Java Simulations: a software tool to create scientific simulations in Java", Computer Physics Communications, Volume 156, Issue 2, 1 January 2004, Pages 199-204</li>
<li><i>Anne Cox</i>, <a rel="nofollow" class="external text" href="http://www.aapt.org/scheduler/sm2009/IndexResult.cfm?Code=PST1A-13">Computational Modeling in Intro Physics Labs: Tracker and EJS</a>, 2009 American Association of Physics Teachers Summer Meeting</li></ul>
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