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Mohammad H. Sattarian mhsattarian

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@also
also / wave.js
Created April 2, 2011 23:50
Generate WAVE file headers in JavaScript
// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
function buildWaveHeader(opts) {
var numFrames = opts.numFrames;
var numChannels = opts.numChannels || 2;
var sampleRate = opts.sampleRate || 44100;
var bytesPerSample = opts.bytesPerSample || 2;
var blockAlign = numChannels * bytesPerSample;
var byteRate = sampleRate * blockAlign;
var dataSize = numFrames * blockAlign;
@pfig
pfig / mkfavicon.sh
Created February 12, 2012 12:01
Make a multi-resolution favicon.ico from a source image, using ImageMagick
#!/bin/bash
# from
# http://bergamini.org/computers/creating-favicon.ico-icon-files-with-imagemagick-convert.html
convert source-WxW.png -resize 256x256 -transparent white favicon-256.png
convert favicon-256.png -resize 16x16 favicon-16.png
convert favicon-256.png -resize 32x32 favicon-32.png
convert favicon-256.png -resize 64x64 favicon-64.png
convert favicon-256.png -resize 128x128 favicon-128.png
@crofty
crofty / index.html
Last active October 22, 2021 08:24
A example of using Google Map tiles with the Leaflet mapping library - http://matchingnotes.com/using-google-map-tiles-with-leaflet
<!DOCTYPE html>
<html>
<head>
<title>Leaflet</title>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.3.1/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet-0.3.1/leaflet.js"></script>
<script src="http://maps.google.com/maps/api/js?v=3.2&sensor=false"></script>
<script src="http://matchingnotes.com/javascripts/leaflet-google.js"></script>
</head>
<body>
@jboner
jboner / latency.txt
Last active May 10, 2024 14:27
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
@MohamedAlaa
MohamedAlaa / tmux-cheatsheet.markdown
Last active May 10, 2024 16:49
tmux shortcuts & cheatsheet

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname
@willurd
willurd / web-servers.md
Last active May 10, 2024 05:14
Big list of http static server one-liners

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000
@seanbuscay
seanbuscay / git_create_orphan.sh
Created June 27, 2013 15:26
Create an orphan branch in a repo.
cd repository
git checkout --orphan orphan_name
git rm -rf .
rm '.gitignore'
echo "#Title of Readme" > README.md
git add README.md
git commit -a -m "Initial Commit"
git push origin orphan_name
@sloria
sloria / bobp-python.md
Last active May 9, 2024 01:42
A "Best of the Best Practices" (BOBP) guide to developing in Python.

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

  • "Build tools for others that you want to be built for you." - Kenneth Reitz
  • "Simplicity is alway better than functionality." - Pieter Hintjens
@drmalex07
drmalex07 / convert-geojson-to-wkt.py
Created May 12, 2014 22:13
Convert GeoJSON to/from WKT in Python. #python #geojson #geometry
import json
import geojson
from shapely.geometry import shape
o = {
"coordinates": [[[23.314208, 37.768469], [24.039306, 37.768469], [24.039306, 38.214372], [23.314208, 38.214372], [23.314208, 37.768469]]],
"type": "Polygon"
}
s = json.dumps(o)
@Kartones
Kartones / postgres-cheatsheet.md
Last active May 10, 2024 14:39
PostgreSQL command line cheatsheet

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)