sorenlouv

function mySlowFunction(baseNumber) {
	console.time('mySlowFunction');
	let result = 0;	
	for (var i = Math.pow(baseNumber, 7); i >= 0; i--) {		
		result += Math.atan(i) * Math.tan(i);
	};
	console.timeEnd('mySlowFunction');
}

mySlowFunction(8); // higher number => more iterations => slower

paulirish

Screencapture and animated gifs

I say "animated gif" but in reality I think it's irresponsible to be serving "real" GIF files to people now. You should be serving gfy's, gifv's, webm, mp4s, whatever. They're a fraction of the filesize making it easier for you to deliver high fidelity, full color animation very quickly, especially on bad mobile connections. (But I suppose if you're just doing this for small audiences (like bug reporting), then LICEcap is a good solution).

Capturing (Easy)

1. Launch quicktime player
2. do Screen recording

joeybaker

# print all the titles in the db
strings -a -t x id_stor  | pcregrep -M '[a-z0-9]{1,9}\stitles\[\n[a-z0-9]{1,9}\s(.*?)u$' | grep -v 'titles' | cut -d " " -f 2- | sort | uniq | sed 's/u$//' | sed 's/://' | sed 's/\///' > couchpotato_export.txt

# get all current movies
# note: with GNU sed, the `sed -E` should be `sed -r`
ls /Volumes/raid6/Movies | sed 's/ ([0-9][0-9][0-9][0-9])//' | sed -E 's/(.*), The/The \1/' | sort > movie_files.txt

# get the wanted movies
grep -v -f couchpotato_export.txt movie_files.txt

O-Zone

(function (window) {
  var transitions = {
    'transition': 'transitionend',
    'WebkitTransition': 'webkitTransitionEnd',
    'MozTransition': 'transitionend',
    'OTransition': 'otransitionend'
  },
  elem = document.createElement('div');
 
  for(var t in transitions){

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs