Like the first reviewer, I have been following the Leanpub version and the repos for some time -- in my case, almost 1 year. If I could give 6 stars, I would. The evolution of the SurviveJS project (book and multiple GitHub repos, taken together) is a testament to the power of open source. The material in this book isn't the product of a single smart React developer, but of more than 1 year of real use and feedback by an active community.
There are other places to go for an introduction to React. But, if you are developing a REAL React application, and need to understand all the related technologies -- Webpack and all related tooling, ES6 as it relates to React, the Flux pattern, etc, etc. -- there is no other resource that comes close to this book and the GitHub repositories associated with it.
Finally, in the (too) fast paced world of JavaScript development, books and OSS projects that are on the leading edge can become obsolete quickly. SurviveJS as a book and an OSS project doesn't look like it will suffer from that fate, given how active is the author and how large its community. Check out GitHub and you'll see what I mean.
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