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Functional programming in Scala : a practical introduction

This is the training material for a two days training session intended for exprerienced programmers without prior experience of functional programming or the Scala programming language.

The training covers the most common syntax and structures of the Scala programming langauge such as methods, functions, Options, Lists and so on. It also covers some of the most important concepts of functional programming such as referntial transparency, totality, algebraic data types ...

These concepts are applied to the realization of a complete and idiomatic Scala application leveraging some of the most important libraries of the ecosytem: Cats Effect and fs2. The project is a Tic Tac Toe game that can be played on the command-line, either with both opponents on the same machine, or remotely by connecting to a TCP server.

Using the material

Beside the master branch, which contains the slides, this project has two main branches:

  • The exercises branch which contains lessons and small associated exercises, as well as the boilerplate for the Tic Tac Toe Project. Exercises have unit tests that you can run to evaluate your solution.
  • The solutions branch contains the solutions to the exercises and the complete application.

Launching the projects

Launch the tests for the small exercises

sbt test

Launch the tests for the Tic Tac Toe logic

sbt ticTacToeCore/test

Launch the local version of the game

sbt ticTacToeCli/run

Launch the network version of the game

sbt ticTacToeNetworkServer/run

To connect to the server

nc localhost 4567

The game starts when two people are connected to the server


This is licensed under a Creative Commons 4.0 BY-NC-SA (Attribution, no commercial use, and share-alike policy).


This project must be attributed to Guillaume Bogard (


Scala assignments to support a 2 days Scala training for beginners







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