Great fast-paced introduction to Scala. Covers a lot of syntax, and new things which Scala does and is advantageous is. This doesn’t set out to show you how to build something from scratch, it’s mostly theory-based rather than applied, but it’s a good reference guide, and first-point for someone not wanting to dive into other books (tomes) on Scala.
Slight gripes, as criticisms are always easier to point out:
Could start with how to structure a Scala package/program.
Not enough on Scala’s advantage in functional programming.
Too much of the book compares Scala to Java arguing why the former is advantageous.