July, 2019: Hello, Scala, is now available only in print form:
It was previously available in PDF and Kindle format, but there are some big changes planned, so those versions have been removed for the time being.
As the subtitle of the book shows, the purpose of this book is to help you learn the Scala programming language with small, easy lessons. The book consists of a little over 50 lessons, and it’s 258 pages long.
You can also preview an older version of the book at my Hello, Scala website.
I’d write more, but all of those links have detailed information about the book, so please visit any of those pages for more information.