Simon Werner psiphi75

Hardware and software developer

psiphi75 / run-server.js

Created February 13, 2017 01:31

Create a CPU profile using Node.js and v8-profiler

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

	profiler.startProfiling();

	while (true) {

	rt.renderFrame(done);

psiphi75 / vector.dot.js

Last active February 13, 2017 03:14

The vector.dot function - it's simple right!?

psiphi75 / vector.dot.js

Created February 13, 2017 03:55

Vector using the classic prototypical object.

	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 / hidden-classes.js

Last active March 29, 2017 00:01

	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 / polymorphic.js

Created February 14, 2017 21:33

Example of polymorphic and monomorphic code

	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 / detect-nodejs.js

Last active February 28, 2017 08:52

Implementing workerjs in code that is used both in the browser and in Node.js

	// 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 / manage-workers.js

Created February 28, 2017 09:07

	// ... 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 / worker.js

Last active February 28, 2017 09:25

Example of WebWorker worker

	// 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 / rPi3-ap-setup.sh

Last active January 7, 2018 20:02 — forked from Lewiscowles1986/rPi3-ap-setup.sh

Raspberry Pi 3 wifi access-point-setup (AP) and internet sharing over ethernet

	#!/bin/bash
	#
	# This version uses September 2017 august stretch image, please use this image
	#

	if [ "$EUID" -ne 0 ]
	then echo "Must be root"
	exit
	fi

psiphi75 / .eslintrc.js

Last active July 26, 2018 21:02

TypeScript + JSDoc + ESLint + Prettier. ESLint rc file.