Reddit mentions of Programming in Scala: Updated for Scala 2.12

You'll definitely wanna check out the coursera course Functional Programming Principles in Scala, and a good textbook I would recommend that covers everything in the language basically, would be Programming in Scala, Third Edition. Both the book, and the course are taught by the creator of the language, Martin Odersky.

From the sidebar:

Free Books, Tutorials and Guides:

• Scala Exercises
  
• Twitter's Scala School
  
• Scala Tutorial
  
• Programming in Scala, First Edition
  
• Hands-on Scala.js
  
• Underscore.io books (many free books)
  
• 47Degrees Scala Exercises
  
• The Neophyte's Guide to Scala
  
  Non-free Books:
  
  
• Programming in Scala, Third Edition
  
• Programming Scala (O'Reilley)
  
• Official book recommendations
  
  Advanced!:
  
  
• Functional Programming in Scala (Manning)
  
• Mastering Advanced Scala

I learned from Programming in Scala and Akka in Action. They're not really tutorials, but they explain a lot of the rationale.

For Scala-the-language I think Odersky's book Programming in Scala is a great intro. I found it extremely readable. One hurdle you might expect coming from JS based on my (limited) experience with JS is due to traditionally object-oriented concepts like inheritance or traditionally functional-programming concepts like closures have meanings and behavior in JS that are not quite the same as in most other languages despite the same terminology, and Scala is built around mixing OO and FP. So be prepared to relearn what some basic concepts mean in the context of a statically-typed mixed-paradigm language.

For Scala-the-ecosystem I'd say start with the basic tools in the sidebar: IntelliJ + Scala plugin and SBT. They'll at least get you building and running some Scala code. I'd take finding libraries for what you need on a case-by-case basis, e.g. waiting until you actually need JSON serialization to before evaluating the various JSON libraries.

/r/Python

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• Programming in Scala, First Edition
  
• [Hands-on Scala.js] (http://lihaoyi.github.io/hands-on-scala-js/#Hands-onScala.js)
  
  Non-free Books:
  
  
• Programming in Scala, Third Edition
  
• Atomic Scala
  
• Programming Scala (O'Reilley)
  
• Functional Programming in Scala (Manning)
  
• Mastering Advanced Scala
  
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