brito brito

raf.js

A simple script with a few niceties that allows for multiple requestAnimationFrame calls, and FPS pinning.

How it works

The script polyfills rAF if required, then overloads requestAnimationFrame and cancelAnimationFrame with a process that allows multiple frames to be queued up for rAF to run.

This is useful if there are multiple animations running on the page, you want all the callbacks to happen at once, and not on multiple rAF calls. This script is meant as a drop-in solution to that problem.

codegolf JS

Mini projects by Maxime Euzière (xem), subzey, Martin Kleppe (aemkei), Mathieu Henri (p01), Litterallylara, Tommy Hodgins (innovati), Veu(beke), Anders Kaare, Keith Clark, Addy Osmani, bburky, rlauck, cmoreau, maettig, thiemowmde, ilesinge, adlq, solinca, xen_the,...

(For more info and other projects, visit http://xem.github.io)

(Official Slack room: http://jsgolf.club / join us on http://register.jsgolf.club)

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Hi:

perl -e 'print "hello world!\n"'

A simple filter:

perl -ne 'print if /REGEX/'

Filter out blank lines (in place):

	// [BCKW](https://en.wikipedia.org/wiki/B,C,K,W_system)
	// compose
	var B = f => g => a => f(g(a))

	// flip
	var C = f => a => b => f(b)(a)

	// Const
	var K = a => b => a

	with recursive r(a, b) as (
	select 0::int, 1::int
	union all
	select b, a + b from r where b < 1000
	)
	select a from r;

	a
	-----
	0

	# Hello, and welcome to makefile basics.
	#
	# You will learn why `make` is so great, and why, despite its "weird" syntax,
	# it is actually a highly expressive, efficient, and powerful way to build
	# programs.
	#
	# Once you're done here, go to
	# http://www.gnu.org/software/make/manual/make.html
	# to learn SOOOO much more.

	/**
	* Retrieves all the rows in the active spreadsheet that contain data and logs the
	* values for each row.
	* For more information on using the Spreadsheet API, see
	* https://developers.google.com/apps-script/service_spreadsheet
	*/
	function readRows() {
	var sheet = SpreadsheetApp.getActiveSheet();
	var rows = sheet.getDataRange();
	var numRows = rows.getNumRows();

	@charset "UTF-8";
	/* ♕β */
	body:before { content:'I vow\A';
	font-family:HelveticaNeue-CondensedBlack }
	body { font:261%/1.6 HelveticaNeue; text-align:right; white-space:pre;
	text-shadow:0 0 3px white;
	background:hsl(333,55%,21%); color:white;
	max-width:11em; margin:1em auto; padding:.3em;
	outline:1px dotted }
	body:after { content:'♕' }

	osascript -e 'tell application "iOS Simulator" to quit'
	osascript -e 'tell application "Simulator" to quit'
	xcrun simctl erase all