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@plbabin
plbabin / gist:908413
Created April 7, 2011 18:47
Small custom jQuery selector that validate if an element has a data attach to himself
$.extend($.expr[':'], {
hasData: function (obj, intStackIndex, arrProperties) {
var arguments = arrProperties[ 3 ];
var $this = $(obj);
var isValid = false;
if(arguments.indexOf('=') > -1){
arguments = arguments.split('=')
if($this.data(arguments[0]) == arguments[1]){
isValid = true;
@aganov
aganov / datetime_ui_input.rb
Created October 4, 2011 13:48
Formtastic jQuery UI date and time picker input
# http://jqueryui.com/demos/datepicker/
# http://fgelinas.com/code/timepicker/
class DatetimeUiInput
include Formtastic::Inputs::Base
DATE_FORMAT = "%Y-%m-%d"
TIME_FORMAT = "%H:%M"
def to_html
@jboner
jboner / latency.txt
Last active November 18, 2024 08:23
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD