Tibor Szász tiborsaas

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Fundamentals: why state machines?

States. The final frontier. These are the voyages of an enterprising developer. Her eternal mission: to explore strange new techniques, to seek out better ways to engineer for mental models and new design patterns. To boldly go where a few awesome devs have gone before.

So you’ve found our poignant guide to SCXML and surely you’re wondering “Why should I want to go out of my way to use formal state machines?” or something like that. Hopefully this introduction addresses that kind of question.

An example: Nancy’s RPG

The problem

Auto-deploying built products to gh-pages with GitHub Actions

This is a set up for projects which want to check in only their source files, but have their gh-pages branch automatically updated with some compiled output every time they push.

A file below this one contains the steps for doing this with Travis CI. However, these days I recommend GitHub Actions, for the following reasons:

It is much easier and requires less steps, because you are already authenticated with GitHub, so you don't need to share secret keys across services like you do when coordinate Travis CI and GitHub.
It is free, with no quotas.
Anecdotally, builds are much faster with GitHub Actions than with Travis CI, especially in terms of time spent waiting for a builder.

	#include <SPI.h>
	#include <MFRC522.h>

	/Using Hardware SPI of Arduino /
	/MOSI (11), MISO (12) and SCK (13) are fixed /
	/You can configure SS and RST Pins/
	#define SS_PIN 10 /* Slave Select Pin */
	#define RST_PIN 7 /* Reset Pin */

	/* Create an instance of MFRC522 */

	//----------------------------------*\
	// TRIGONOMETRY FUNCTIONS
	//----------------------------------*/

	// # Trigonometry in CSS
	//
	// - Through Taylor/Maclaurin polynomial representation: http://people.math.sc.edu/girardi/m142/handouts/10sTaylorPolySeries.pdf
	// - Useful if you don't want to use JS.
	// - With CSS Variables.
	// - `calc()` can't do power (x ^ y) so I used multiplication instead.

	function createStore (reducers) {
	var state = reducers()
	const store = {
	dispatch: (action) => {
	state = reducers(state, action)
	},
	getState: () => {
	return state
	}
	}

	sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
	sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443
	sudo sh -c "iptables-save > /etc/iptables.rules"
	sudo apt-get install iptables-persistent

	#include "ofMain.h"
	#include "ofxTiming.h"

	class ofApp : public ofBaseApp {
	public:
	ofVideoGrabber grabber;
	DelayTimer delay;
	ofTrueTypeFont font;
	string description;

	varying vec2 vUv;

	uniform sampler2D tDiffuse;
	uniform sampler2D tColorLUT;
	uniform vec2 resolution;

	#pragma glslify: blendOverlay = require(./glsl-blend-overlay)
	#pragma glslify: displace = require(./glsl-displace)
	#pragma glslify: srcOver = require(./glsl-src-over)
	#pragma glslify: colorCorrect = require(glsl-lut/flipY)

	function derivative(f) {
	var h = 0.001;
	return function(x) { return (f(x + h) - f(x - h)) / (2 * h); };
	}

	console.log(" cos(2) = " + Math.cos(2));
	console.log("-sin(2) = " + Math.sin(2));
	console.log("(d cos/dx)(2) = " + derivative(Math.cos)(2));

	function f(x) { return Math.pow(x, 3) + 2 * x + 1; };