Great examples, code, and explanations
Spectacular job of keeping things simple by only focusing on one point at a time, choosing great examples, and using readable code with well-crafted, simple explanations. Many authors try to achieve this the lazy way- by omitting large amounts of code and relying on the reader to download it and understand it on her own. By contrast, the Learning React author included all of the code in the book and was not afraid to repeat code when it reinforced his point.