Johann Chang mrjohannchang

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WebSockets - An Introduction

WebSockets is a modern HTML5 standard which makes communication between client and server a lot more simpler than ever. We are all familiar with the technology of sockets. Sockets have been fundamental to network communication for a long time but usually the communication over the browser has been restricted. The general restrictions

The server used to have a permanent listener while the client (aka browser) was not designated any fixed listener for a more long term connection. Hence, every communication was restricted to the client demanding and the server responding.
This meant that unless the client requested for a particular resource, the server was unable to push such a resource to the client.
This was detrimental since the client is then forced to check with the server at regular intervals. This meant a lot of libraries focused on optimizing asynchronous calls and identifying the response of asynchronous calls. Notably t

Whether you're trying to give back to the open source community or collaborating on your own projects, knowing how to properly fork and generate pull requests is essential. Unfortunately, it's quite easy to make mistakes or not know what you should do when you're initially learning the process. I know that I certainly had considerable initial trouble with it, and I found a lot of the information on GitHub and around the internet to be rather piecemeal and incomplete - part of the process described here, another there, common hangups in a different place, and so on.

In an attempt to coallate this information for myself and others, this short tutorial is what I've found to be fairly standard procedure for creating a fork, doing your work, issuing a pull request, and merging that pull request back into the original project.

Creating a Fork

Just head over to the GitHub page and click the "Fork" button. It's just that simple. Once you've done that, you can use your favorite git client to clone your repo or j

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

To remove a submodule you need to:

Delete the relevant section from the .gitmodules file.
Stage the .gitmodules changes git add .gitmodules
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Run rm -rf .git/modules/path_to_submodule (no trailing slash).
Commit git commit -m "Removed submodule "
Delete the now untracked submodule files rm -rf path_to_submodule

	import threading
	import time


	class ThreadingExample(object):
	""" Threading example class

	The run() method will be started and it will run in the background
	until the application exits.
	"""

	#!/bin/bash

	# usage: nbgrep 'pattern'

	SEARCHPATH=~/work/

	# 'jq' technique lifted with gratitude
	# from https://gist.github.com/mlgill/5c55253a3bc84a96addf

	# Break on newlines instead of any whitespace

	# Modified by ralexx to work on Solarized light
	#
	# Clean, simple, compatible and meaningful.
	# Tested on Linux, Unix and Windows under ANSI colors.
	# It is recommended to use with a dark background and the font Inconsolata.
	# Colors: black, red, green, yellow, *blue, magenta, cyan, and white.
	#
	# http://ysmood.org/wp/2013/03/my-ys-terminal-theme/
	# Mar 2013 ys
	# The basic theme format:

	# iw wlan0 scan \| sed -e 's#(on wlan# (on wlan#g' \| awk -f scan.awk
	$1 == "BSS" {
	MAC = $2
	print $2
	e = wifi[MAC]
	e["enc"] = "Open"
	}
	$1 == "SSID:" {
	e = wifi[MAC]
	e["SSID"] = $2

	# Steps to build and install tmux from source.
	# Takes < 25 seconds on EC2 env [even on a low-end config instance].

	VERSION=2.7
	sudo yum -y remove tmux
	sudo yum -y install wget tar libevent-devel ncurses-devel
	wget https://github.com/tmux/tmux/releases/download/${VERSION}/tmux-${VERSION}.tar.gz
	tar xzf tmux-${VERSION}.tar.gz
	rm -f tmux-${VERSION}.tar.gz
	cd tmux-${VERSION}