NPM VS Yarn - Cheatsheet

At Facebook we’re already using Yarn in production, and it’s been working really well for us.  It powers the dependency and package management for many of our JavaScript projects.  With each migration we’ve enabled engineers to build offline and helped speed up their workflow. - —  Sebastian McKenzie, Yarn: A new package manager for JavaScript

If your switching to Yarn from NPM then here is a quick cheatsheet to get you started: