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@banksean
banksean / mersenne-twister.js
Created February 10, 2010 16:24
a Mersenne Twister implementation in javascript. Makes up for Math.random() not letting you specify a seed value.
/*
I've wrapped Makoto Matsumoto and Takuji Nishimura's code in a namespace
so it's better encapsulated. Now you can have multiple random number generators
and they won't stomp all over eachother's state.
If you want to use this as a substitute for Math.random(), use the random()
method like so:
var m = new MersenneTwister();
@jcxplorer
jcxplorer / uuid.js
Created February 12, 2011 16:58
UUID v4 generator in JavaScript (RFC4122 compliant)
function uuid() {
var uuid = "", i, random;
for (i = 0; i < 32; i++) {
random = Math.random() * 16 | 0;
if (i == 8 || i == 12 || i == 16 || i == 20) {
uuid += "-"
}
uuid += (i == 12 ? 4 : (i == 16 ? (random & 3 | 8) : random)).toString(16);
}
@caseyjustus
caseyjustus / median.js
Created August 23, 2011 19:34
calculate the median of an array with javascript
function median(values) {
values.sort( function(a,b) {return a - b;} );
var half = Math.floor(values.length/2);
if(values.length % 2)
return values[half];
else
return (values[half-1] + values[half]) / 2.0;
@timoxley
timoxley / isPortTaken.js
Last active April 19, 2024 11:51
check if a port is being used with nodejs
var isPortTaken = function(port, fn) {
var net = require('net')
var tester = net.createServer()
.once('error', function (err) {
if (err.code != 'EADDRINUSE') return fn(err)
fn(null, true)
})
.once('listening', function() {
tester.once('close', function() { fn(null, false) })
.close()
@troyk
troyk / contacts.js
Created February 23, 2012 12:38
Mongoose multiple schemas in single collection
// Don't care much about inheritance at this point, but I'll probably attempt it at
// some point via cloning ancestor schema's
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var Contact = new Schema({
_type: String,
name: String
});
@yenliangl
yenliangl / flac2alac.bash
Created March 12, 2012 05:39
Convert flac to Alac (Apple Lossless Audio Codec)
# convert flac files in current directory to Apple loss-less codec.
function flac2alac {
for f in *.flac; do
ffmpeg -i "$f" -acodec alac "${f%.flac}.m4a"
#-map_meta_data $f:${f%.flac}.m4a;
done
}
@jpoehls
jpoehls / node-cluster-messaging.js
Created March 29, 2012 01:48
Simple message passing between cluster master and workers in Node.js
var cluster = require('cluster');
if (cluster.isWorker) {
console.log('Worker ' + process.pid + ' has started.');
// Send message to master process.
process.send({msgFromWorker: 'This is from worker ' + process.pid + '.'})
// Receive messages from the master process.
@cuppster
cuppster / node-express-cors-middleware.js
Created April 9, 2012 16:02
express.js middleware to support CORS pre-flight requests
app.use(express.methodOverride());
// ## CORS middleware
//
// see: http://stackoverflow.com/questions/7067966/how-to-allow-cors-in-express-nodejs
var allowCrossDomain = function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
@matope
matope / NoSQLデータモデリング技法.markdown
Created April 16, 2012 03:35
NoSQLデータモデリング技法

#NoSQLデータモデリング技法

原文:NoSQL Data Modeling Techniques « Highly Scalable Blog

I translated this article for study. contact matope[dot]ono[gmail] if any problem.

NoSQLデータベースはスケーラビリティ、パフォーマンス、一貫性といった様々な非機能要件から比較される。NoSQLのこの側面は実践と理論の両面からよく研究されている。ある種の非機能特性はNoSQLを利用する主な動機であり、NoSQLシステムによく適用されるCAP定理がそうであるように分散システムの基本的原則だからだ。一方で、NoSQLデータモデリングはあまり研究されておらず、リレーショナルデータベースに見られるようなシステマティックな理論に欠けている。本稿で、私はデータモデリングの視点からのNoSQLシステムファミリーの短い比較といくつかの共通するモデリングテクニックの要約を解説したい。

本稿をレビューして文法を清書してくれたDaniel Kirkdorfferに感謝したいと思う

@aheckmann
aheckmann / storeImgInMongoWithMongoose.js
Created April 17, 2012 19:14
store/display an image in mongodb using mongoose/express
/**
* Module dependencies
*/
var express = require('express');
var fs = require('fs');
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
// img path