Quick Online Exercises

Scala Exercises is a series of lessons and exercises created by 47 Degrees. It's a great way to get a brief introduction to Scala while testing your knowledge along the way.

Online Courses from EPFL

The following courses are available for free. They teach you the main features of the Scala language and introduce you to functional programming. They are published on both Coursera and edX (either on an EPFL-hosted Open edX instance at courseware.epfl.ch, or on www.edx.org).

Functional Programming in Scala Specialization (on Coursera). The Specialization provides a hands-on introduction to functional programming using Scala. You can access the courses material and exercises by either signing up for the specialization or auditing the courses individually. The specialization has the following courses.
- Functional Programming Principles in Scala (Coursera and Open edX),
- Functional Program Design in Scala (Coursera and Open edX),
- Parallel programming (Coursera and Open edX),
- Big Data Analysis with Scala and Spark (Coursera and Open edX),
- Functional Programming in Scala Capstone (Coursera only),
Programming Reactive Systems (edX only).

Note : On Coursera and edX, there is a paid version available. The only difference with the free version is that the paid version delivers a certificate of completion. Learn more about Coursera certificates or edX certificates.

Dr.Mark C Lewis's Lectures from Trinity University

Dr.Mark C Lewis from Trinity University, San Antonio, TX, teaches programming courses using the Scala language. Course videos are available in YouTube for free. Some of the courses below.
- Introduction to Programming and Problem Solving Using Scala
- Object-Orientation, Abstraction, and Data Structures Using Scala

You can visit his YouTube channel for more videos.

Try Scala In Your Browser!

There are a handful of websites where you can interactively run Scala code in your browser! Have a look at ScalaFiddle and Scastie.

allaboutscala

allaboutscala provides detailed tutorials for beginners.

ScalaCourses

Independent Courseware, online self-study or instructor-led Scala and Play courses for a fee.

Visual Scala Reference

Visual Scala Reference, a guide to visually learn about Scala concepts and functions.