Learn Kotlin Programming: A comprehensive guide to OOP, functions, concurrency, and coroutines in Kotlin 1.3, 2nd Edition

I am at page 223 of this 500 page book and that will probably do it for me. Undoubtedly the author knows a great deal about Kotlin but the book reads like a stream of consciousness log that was somewhat arbitrarily partitioned and then rearranged into chapters that are somewhat out of order and often overlapping in purpose.In the very early chapters the author often found it necessary to use a language feature in an example that had not yet been covered. This is common in programming books. And initially he, as other authors, would point this out and say where this would be explained in more detail later on. But after the first few chapters it seems he gave up doing this, leaving the reader to wonder Hey, what is this? Did I miss something? Unfortunately, a check of the index for this feature sometimes produced no entries.In trying to convince the reader that some feature is compatible with Java or that it is efficiently implemented the author would often include large blocks of javap-generated JVM bytecode. This is unnecessary, tedious, and waste of paper (see attached scan).Speaking of paper, this book is printed in a curiously large font size, forcing a lot of the code examples to margin wrap and adding probably 75 pages to the book's size.In sum, the reader would be better served by the documentation at kotlinlang.org until the next, hopefully better, Kotlin book comes out.

Not written very well. It is obvious authors know the product but did not explain it clearly.