You Don't Know JS: Scope and Closures
by Kyle Simpson
Publisher: O'Reilly 2014
Number of pages: 98
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by Cody Lindley - Syncfusion Inc.
by Rebecca Murphey
by Axel Rauschmayer - ExploringJS.com
by Paul Hudson - Leanpub
A hands-on introduction to making a web app using React 0.14, React Router 1.0, ES6, Jest and more. Each chapter is very short, it takes about 5 minutes to complete, although a handful might take 10 minutes because they cover more complicated topics.