Syncfusion is a very interesting company. They’ve published over 90 technical e-books on a wide range of subjects. Each book has about 100 pages which means authors have to get to the point quickly. Each e-book has the word “Succinctly” in the title. See http://www.syncfusion.com/.
The Syncfusion e-books are somewhat similar to the O’Reilly “in a nutshell” books but with one difference — the Syncfusion e-books are free with no strings attached. (Well, you do have to give an e-mail address for marketing purposes but Syncfusion is very restrained in their volume of messages).
I’ve written a couple of Syncfusion e-books myself and I’ve served as the technical reviewer for about a dozen of the books. One of the books I reviewed, “Leaflet.js Succinctly”, was released recently.
The author of “Leaflet.js Succinctly” is Mark Lewin. In addition to being technically accurate, Mark has a very nice writing style and, in my opinion, combines his code examples with his text explanations in just the right way.
Anyway, if you’re interested in maps on a Web page, I recommend you download (for free!) “Leaflet.js Succinctly” from the Syncfusion site.