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What is WebRTC? [OS]

WebRTC is a Protocol specifically designed for Peer-To-Peer streaming of video + audio. It includes video/audio compression algorithms/codecs, key framing, session control, etc. It does offer some messaging but that part of the protocol doesn't work very well. As a Protocol, like ftp, http, smtp, etc., it requires support at a lower level than the Application tier in most cases. Currently, support for the WebRTC protocol is not on every device/operating system. Notably, Apple devices don't support WebRTC natively. You can see support here: http://iswebrtcreadyyet.com/ and http://caniuse.com/#feat=rtcpeerconnection. Since Apple doesn't support natively, an SDK for iOS is needed, there is an open source one, or you can go with a full service SaaS with an SDK. The upsides of WebRTC is that it is free, works pretty well, and handles automatic upgrading and downgrading of compression/quality based on latency. The downsides of WebRTC is that the standards are still evolving, changing, a

Starting out with Competitive Programming

(This guide is meant for beginners. If you have solved 100+ problems and are looking for guidance on how to solve problems involving algorithms and data structures, this document is not for you.)

Competitive Programming is an interesting activity which mixes problem solving with programming. It is not only enjoyable but also very demanded in placements. Competitive programming will make you very good at writing efficient programs quickly.

How to run Express inside an Electron app

You can run your Express app very easily inside your Electron app.

All you need to do is to:

place all the files of your Express app inside a new app folder in your_electron_app\resources\app
reconfigure the app.js file
refactor some relative pathes in your Express app

Install Terminator (shell)

sudo add-apt-repository ppa:gnome-terminator
sudo apt-get update
sudo apt-get install terminator

Terminator should be setup as default now. Restart your terminal (shortcut: "Ctrl+Alt+T").

Install ZSH

Let's Encrypt

Examples of getting certificates from Let's Encrypt working on Apache, NGINX and Node.js servers.

Obtain certificates

I chose to use the manual method, you have to make a file available to verify you own the domain. Follow the commands from running

git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt

Squashing Git Commits

The easy and flexible way

This method avoids merge conflicts if you have periodically pulled master into your branch. It also gives you the opportunity to squash into more than 1 commit, or to re-arrange your code into completely different commits (e.g. if you ended up working on three different features but the commits were not consecutive).

Note: You cannot use this method if you intend to open a pull request to merge your feature branch. This method requires committing directly to master.

Switch to the master branch and make sure you are up to date:

Use these rapid keyboard shortcuts to control the GitHub Atom text editor on macOS.

Key to the Keys

⌘ : Command key
⌃ : Control key
⌫ : Delete key
← : Left arrow key
→ : Right arrow key
↑ : Up arrow key

	// sending to sender-client only
	socket.emit('message', "this is a test");

	// sending to all clients, include sender
	io.emit('message', "this is a test");

	// sending to all clients except sender
	socket.broadcast.emit('message', "this is a test");

	// sending to all clients in 'game' room(channel) except sender

	The MIT License (MIT)

	Copyright (c) 2015 Justin Perry

	Permission is hereby granted, free of charge, to any person obtaining a copy of
	this software and associated documentation files (the "Software"), to deal in
	the Software without restriction, including without limitation the rights to
	use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
	the Software, and to permit persons to whom the Software is furnished to do so,
	subject to the following conditions: