psiphi75

// This is our computation, we just initialise it for now.
var rt = new RayTracer(700, 700);

// we are in the worker.js thread so 'this' has the correct scope.
this.addEventListener('message', function(e) {
  
    // Start the work
    if (e.message === 'Start your work') {
        var result = rt.raytrace();
      

psiphi75

// ... continuing from code above.

// We create the worker, the work can actally begin (but will give the 
// worker a message to start later).
var worker = new UniversalWorker(uri);

// Listen to all messages from the worker.
worker.addEventListener('message', waitForResult, { once: true });

// We send a message to the worker, this can be any primitive or object, 

psiphi75

// A reliable method to detect if we are running in Node.js
const isNodeJS = new Function('try {return this===global;}catch(e){return false;}')();

var UniversalWorker;
var uri;

if (isNodeJS) {
    
    // Dynamically load "workerjs"
    UniversalWorker = require('workerjs');      

psiphi75

function add(a, b) {
    return a + b;
}
add(1, 2);          // Starts as monomorphic
add(2, 3);          // Still monomorphic
add('x', 'y');      // Now becomes polymorphic - bad for optimisation

psiphi75

fuction vector(x, y) {
    this.x = x;
    this.y = y;
}

const a = new vector(1, 2);
const b = new vector(3, 4);    // OKAY: b has the same hidden class as a
b.z = 5;                        // BAD: b now has a different hidden class

psiphi75

function Vector(x, y, z) {
    this.x = x;
    this.y = y;
    this.z = z;
}
Vector.prototype.dot = function(w) {
    return this.x * w.x + this.y * w.y + this.z * w.z;
};
// ... more vector functions

psiphi75

var vector = {
    make: function (x, y, z) {
        if (x instanceof Array) {
            return [x[0], x[1], x[2]];
        } else {
            return [x, y, z];
        }
    },
    dot: function (v, w) {
        return (v[0] * w[0] + v[1] * w[1] + v[2] * w[2]);

psiphi75

var profiler = require('v8-profiler');
var fs = require('fs');
var processStartTime = new Date().getTime();

profiler.startProfiling();

while (true) {
  
    rt.renderFrame(done);