| javascript:(function(){(function printStats(){var loadTimes=window.chrome.loadTimes();firstPaint=loadTimes.firstPaintTime*1000;firstPaintTime=firstPaint-(loadTimes.startLoadTime*1000);console.info('First paint took',firstPaintTime,'ms');console.info('Load took',performance.timing.loadEventStart-performance.timing.navigationStart,'ms');var instances=0;if(parseFloat(Polymer.version)<1){instances=[].slice.call(document.querySelectorAll('html /deep/ *')).filter(function(el){return el.localName.indexOf('-')!=-1||el.getAttribute('is');}).length;}else{instances=Polymer.telemetry.instanceCount;}console.info('Custom element instances:',instances);var reflectCount=0;if(Polymer.telemetry){console.info('=== Properties set to reflectToAttribute ===');Polymer.telemetry.registrations.forEach(function(el){for(var prop in el.properties){if(el.properties[prop].reflectToAttribute){console.log(el.is+'.'+prop);reflectCount++;}}});}else{console.info('=== Properties set to reflect ===');Polymer.elements.forEach(function(el){for(var |
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.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
Looking for support tables for HTML/CSS/JavaScript features or details on their implementation status in major browsers?
And then there’s Can I use…?.
| /*<?php | |
| //*/public class PhpJava { public static void main(String[] args) { System.out.printf("/*%s", | |
| //\u000A\u002F\u002A | |
| class PhpJava { | |
| static function main() { | |
| echo(//\u000A\u002A\u002F | |
| "Hello World!"); | |
| }} | |
| //\u000A\u002F\u002A | |
| PhpJava::main(); |
| int doubler(int x) { | |
| return 2 * x; | |
| } |
| //------------------------------------------------------------------------------ | |
| // NetClient.cc | |
| //------------------------------------------------------------------------------ | |
| #if ORYOL_WINDOWS | |
| #define _WINSOCK_DEPRECATED_NO_WARNINGS (1) | |
| #include <WinSock2.h> | |
| typedef int ssize_t; | |
| #endif | |
| #if ORYOL_POSIX |
Someone sent me an email asking me what advice I had for new developers. I get this question a bunch, so I wanted to put all my thoughts in one place, that I can update as I get more ideas!
I answered this a bunch on my AMA repo, so here's some initial general answers, before I get to some of the specific questions:
| HTTPPort 8090 | |
| HTTPBindAddress 0.0.0.0 | |
| MaxHTTPConnections 200 | |
| MaxClients 100 | |
| MaxBandWidth 500000 | |
| CustomLog - | |
| <Feed camera.ffm> | |
| File /tmp/camera.ffm | |
| FileMaxSize 200M |
Copyright 2018 Moddable Tech, Inc.
Peter Hoddie
Patrick Soquet
Updated December 17, 2018
The I/O class pattern is designed to be applied to many different interfaces. These include digital, analog input, SPI, I2C, serial, TCP socket, UDP socket, etc. Each of these defines a class pattern for the interface (e.g. a Digital class pattern) that is a logical subclass of the I/O class pattern.
The I/O class pattern assumes read and write operations will not block for significant periods of time (this is deliberately not quantified). The model for this is non-blocking network sockets.
Image stacking is a collection of related techniques used in astrophotography which all use multiple images taken by a camera to achieve a more detailed photo than would otherwise be possible. I’ve talked about image stacking in the past, but I hand-waved the statistical parts a bit. In this post, I want to dig into those mathematical details so that you understand why image stacking actually works.
But first, I’ll tell a story about thermometers. We’ll come back to image stacking after that.
Let’s imagine you’re a scientist, and you need to know the temperature of the room you’re in to within a tenth of a degree in order to run an experiment. You dutifully order a super expensive NIST-traceable thermometer online, but on the day it arrives, you open the box only to discover that you got a hundred cheap alcohol thermometers instead.
The expensive thermometer would have done the job to within a hundredth of a degree, but now it’s too late to wait for a new one to arrive, and all you have are these che