SIM.JS is an event-based discrete-event simulation library based on standard JavaScript. The library has been written in order to enable simulation within standard browsers by utilizing web technology.

SIM.JS, a free discrete-event simulation package based on JavaScript
Original author(s)Maneesh Varshney
Developer(s)Maneesh Varshney
Stable release
0.26 / January 16, 2012; 12 years ago (2012-01-16)
Written inJavaScript
Operating systemCross-platform
TypeDiscrete event simulation
LicenseLGPL
Websitesimjs.z5.web.core.windows.net code.google.com/p/simjs-source/

SIM.JS supports entities, resources (Facility, Buffers and Stores), communication (via Timers, Events and Messages) and statistics (with Data Series, Time Series and Population statistics).

The SIM.JS distribution contains tutorials, in-depth documentation, and a large number of examples.

SIM.JS is released as open source software under the LGPL license. The first version was released in January 2011.

Example

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There are several examples bundled with the library download. Trafficlight simulation is a standard simulation problem, which may be simulated as within this example:

function trafficLightSimulation(GREEN_TIME, MEAN_ARRIVAL, SEED, SIMTIME) {
    var sim = new Sim();
    var random = new Random(SEED);
    var trafficLights = [new Sim.Event("North-South Light"),
                         new Sim.Event("East-West Light")]; 
    var stats = new Sim.Population("Waiting at Intersection");
    
    var LightController = {
        currentLight: 0,  // the light that is turned on currently
        start: function () {
            sim.log(trafficLights[this.currentLight].name + " OFF"
                    + ", " + trafficLights[1 - this.currentLight].name + " ON");
            sim.log("------------------------------------------");
            // turn off the current light
            trafficLights[this.currentLight].clear();
            // turn on the other light.
            // Note the true parameter: the event must "sustain"
            trafficLights[1 - this.currentLight].fire(true);
            // update the currentLight variable
            this.currentLight = 1 - this.currentLight;
            // Repeat every GREEN_TIME interval
            this.setTimer(GREEN_TIME).done(this.start);
        }
    };
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