Michael Dayah Lucent

Last updated: 2017-03-18

Searching for Files

Find images in a directory that don't have a DateTimeOriginal

exiftool -filename -filemodifydate -createdate -r -if '(not $datetimeoriginal) and $filetype eq "JPEG"' .

###Output photos that don't have datetimeoriginal to a CSV### Note this can take a long time if you have a lot of jpgs

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

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

`<script> async, defer, async defer, module, nomodule, src, inline` - the cheat sheet

This document is a comparison of various ways the <script> tags in HTML are processed depending on the attributes set.

If you ever wondered when to use inline <script async type="module"> and when <script nomodule defer src="...">, you're in the good place!

Note that this article is about <script>s inserted in the HTML; the behavior of <script>s inserted at runtime is slightly different - see Deep dive into the murky waters of script loading by Jake Archibald (2013)

	ALL OREAND THE GIFCHERRY BUSH DA BOON CHASED DA WHEASELGIFPASTECLITNUGGET SHIT
	WH0A WHUT W00D PEEPUHL THEEENK IF DAY GN00 EYE WUZ A JEEEZUS FREEEK?!
	EYE WENT TO THE TRAK TO WAATCH THE PONYNUGGETS RHUN AROUND THE GIFPASTE
	MY MOM HAS A GARDUN WAREZ SHE GROZE KUMKUWAITS
	THERE'S AN ASSNUGGET 4 ALL YA JEWS AND HOMERSEXULES
	A DIQ IZ FER DISPENISING JIZZJ00CE IN DA CLITSAQ JIZZPOQIT
	NO WAY JAQNAD, EYE GOT ENOUGH OF DEM SHITSTAYN THINGYS FOR GNO MHORE
	EYE WHISH I COULD LIFT HVY TINGS LYKE DOZE GUIZ ON TEEVHEE
	AOL E_MAILWAREZ IS 2 31337 FOR THE CLITSAQLIKES OFF MIZZEE
	SIMPSONS WIN95 THEME R0X! THOT I'D LET Y'ALL KNOW

	var Campfire = require('campfire').Campfire;
	var request = require('request');

	var areaCode = 972;
	var campfire = new Campfire({ ssl: true, token: 'YOUR CAMPFIRE API TOKEN HERE', account: 'YOUR CAMPFIRE SUBDOMAIN NAME HERE' });
	var headers = { Cookie: 'YOUR www.google.com COOKIE HERE' };
	var url = 'https://www.google.com/voice/setup/searchnew/?ac=' + areaCode + '&start=0&country=US';

	request.get({ url: url, headers: headers }, function(error, response, body) {
	var json = JSON.parse(body);

	Create a new bookmark and set it's URL to this:

	javascript:(function(xs)%7Bfor(var%20i%3D0%3Bi%3Cxs.length%3B%2B%2Bi)%7Bif(xs%5Bi%5D.currentSrc)%7Breturn%20window.open(xs%5Bi%5D.currentSrc)%3B%7D%7D%7D)(document.querySelectorAll('audio%2Cvideo'))%3B

	When media is playing using HTML5 audio/video you can click this bookmark to open a new tab/window with the media. Then to download it use the context menu action "Save As..." (right mouse button -> Save As...).

	If you use Chrome/Safari/recent Opera (WebKit/Blink) you can do better(!) and immediately download the file using this bookmarklet instead:

	javascript:(function(xs)%7Bfor(var%20i%3D0%3Bi%3Cxs.length%3B%2B%2Bi)%7Bif(xs%5Bi%5D.currentSrc)%7Bvar%20a%3Ddocument.createElement('a')%3Ba.target%3D'_blank'%3Ba.download%3D''%3Ba.href%3Dxs%5Bi%5D.currentSrc%3Ba.click()%3Breturn%3B%7D%7D%7D)(document.querySelectorAll('audio%2Cvideo'))%3B

	// using ES6 Proxy to let Promises/Observables pretend like they're regular values.

	// get the mapping function used for async objects
	let getMapper = (target) => target instanceof Promise ? 'then' :
	target instanceof Observable ? 'switchMap' : null;
	// ^ fails if the Observable is in a local namespace e.g. Rx.Observable

	// bind a value to its object if it's a function
	let bindFn = (val, obj) => typeof val == 'function' ? val.bind(obj) : val;

	function createObservable(observable, { onGet, onSet }) {
	const interceptor = {
	get(target, key, receiver) {
	onGet(key)
	return target[key]
	},
	set(target, prop, value) {
	onSet(prop, value)
	return true
	}

	<svg width="300" height="300" viewBox="0 0 300 300">
	<defs>
	<filter id="paperEffect">
	<feTurbulence
	type="fractalNoise"
	baseFrequency="0.04"
	numOctaves="5"
	result="noise"
	/>
	<feDiffuseLighting