Sam Gluck sdgluck

Edit — February 2019

This gist had a far larger impact than I imagined it would, and apparently people are still finding it, so a quick update:

TC39 is currently moving forward with a slightly different version of TLA, referred to as 'variant B', in which a module with TLA doesn't block sibling execution. This vastly reduces the danger of parallelizable work happening in serial and thereby delaying startup, which was the concern that motivated me to write this gist
In the wild, we're seeing (async main(){...}()) as a substitute for TLA. This completely eliminates the blocking problem (yay!) but it's less powerful, and harder to statically analyse (boo). In other words the lack of TLA is causing real problems
Therefore, a version of TLA that solves the original issue is a valuable addition to the language, and I'm in full support of the current proposal, which you can read here.

I'll leave the rest of this document unedited, for archaeological

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

Debug your PHP in Docker with Intellij/PHPStorm and Xdebug

For your local dev, create a Dockerfile that is based on your production image and simply install xdebug into it. Exemple:

FROM php:5

RUN yes | pecl install xdebug \
&amp;&amp; echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" &gt; /usr/local/etc/php/conf.d/xdebug.ini \

	#!/bin/sh

	command="${*}"
	printf "Initialized REPL for `%s`\n" "$command"
	printf "%s> " "$command"
	read -r input
	while [ "$input" != "" ];
	do
	eval "$command $input"
	printf "%s> " "$command"

	// SOLUTION 1
	// see https://groups.google.com/forum/#!topic/golang-nuts/ChPxr_h8kUM
	func maybe(b bool, c chan int) chan int {
	if !b {
	return nil
	}
	return c
	}

	select {

	➜ pretty-format git:(perf) ✗ npm run perf

	> [email protected] perf /Users/thejameskyle/Projects/pretty-format
	> node perf/test.js

	empty arguments:
	prettyFormat() - 662ns - 0.066249041s total (100000 runs) - "Arguments []"
	JSON.stringify() - 738ns - 0.073823264s total (100000 runs) - "{}"
	util.inspect() - 55131ns - 5.513100926s total (100000 runs) - "{ [length]: 0,\n [callee]: \n { [Function: returnArguments]\n [length]: 0,\n [name]: 'returnArguments',\n [arguments]: null,\n [caller]: null,\n [prototype]: returnArguments { [constructor]: [Circular] } },\n [Symbol(Symbol.iterator)]: \n { [Function: values]\n [length]: 0,\n [name]: 'values',\n [prototype]: values { [constructor]: [Circular] } } }"

	function Enum(names) {
	let members = Object.create(null);

	members.tryParse = name => {
	if (!members[name]) {
	throw new Error(`Unable to parse '${name}' as an Enum member.`);
	}
	return members[name];
	};

	---

	hosts: all
	tasks:
	- name: add github ssh key
	copy: >
	src=files/id_rsa.github
	dest=/root/.ssh/id_rsa.github
	owner=root
	group=root

	let mix = (object) => ({
	with: (...mixins) => mixins.reduce(
	(c, mixin) => Object.create(
	c, Object.getOwnPropertyDescriptors(mixin)
	), object)
	});

	import requests
	import time
	import json

	token = ''

	#Delete files older than this:
	ts_to = int(time.time()) - 30 * 24 * 60 * 60

	def list_files():