Oleg ffeast

An Ansible summary

Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)

Configuration file

First one found from of

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

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	class UnionFind:
	"""Weighted quick-union with path compression and connected components.

	The original Java implementation is introduced at
	https://www.cs.princeton.edu/~rs/AlgsDS07/01UnionFind.pdf

	>>> uf = UnionFind(10)
	>>> for (p, q) in [(3, 4), (4, 9), (8, 0), (2, 3), (5, 6), (5, 9),
	... (7, 3), (4, 8), (6, 1)]:
	... uf.union(p, q)

	// Store ad tags in localStorage to enable reporting bad ads
	// TODO: This doesn't work if multiple ads are shown in one placement with googletag.pubads().refresh()
	googletag.pubads().addEventListener('slotRenderEnded', function (event) {
	if (typeof(localStorage) !== 'object') console.log('fail');
	if (event.slot.getResponseInformation() === null) return;

	var slotAdUnitPath = event.slot.getAdUnitPath();
	gpt_placements[slotAdUnitPath] = {};
	gpt_placements[slotAdUnitPath]['dfp'] = event.slot.getResponseInformation();
	gpt_placements[slotAdUnitPath]['dfp']['contentUrl'] = event.slot.getContentUrl();

	<html>
	<head>

	<script>

	var PREBID_TIMEOUT = 400;

	var googletag = googletag \|\| {};
	googletag.cmd = googletag.cmd \|\| [];

	/*
	Do not modify this version of the file. It will be copied over when any of the project's targets are built.
	If you wish to modify mraid.js, modify the version located at mopub-sdk-common/mraid/mraid.js.
	*/
	(function() {
	var isIOS = (/iphone\|ipad\|ipod/i).test(window.navigator.userAgent.toLowerCase());
	if (isIOS) {
	console = {};
	console.log = function(log) {
	var iframe = document.createElement('iframe');

	--regex-LUA=/^.\sfunction[ \t]([a-zA-Z0-9_]+):([a-zA-Z0-9_]+).$/\2/f,function/
	--regex-LUA=/^.\sfunction[ \t]([a-zA-Z0-9_]+)\.([a-zA-Z0-9_]+).$/\2/f,function/
	--regex-LUA=/^.\sfunction[ \t]([a-zA-Z0-9_]+)\s\(.*$/\1/f,function/

	--regex-LUA=/([a-zA-Z0-9_]+) = require[ (]"([^"]+)"/\1/r,require/

	--regex-LUA=/[ \t]{1}([a-zA-Z0-9_]+)[ \t]*[=][^=]/\1/v,variable/

	--regex-LUA=/[ \t]([a-zA-Z0-9_]+)[ \t]=[ \t]module_define.$/\1/m,module/
	--regex-LUA=/func_table\[ msg\.([A-Z_]+) \].+/\1/

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'