The Game Engine

The game engine is a simple machine. It may start a game or compute a guess, and it will always return a game_status:

{
  status: RUNNING,
  word: 'banana',
  guesses: ['a', 'b', 'c', 'd'],
  display_word: 'b a _ a _ a',
  lives: 3 // Initial 5 - 2 wrong guesses
}

💡 Exercise 1: Packages and Build Automation 💡

Add the package you just created to your package.json file and try it! Well, if you did everything right, a strange error will appear.

Fix this error (you might need to change the random_line package), and update your package.json if needed.

💡 Exercise 2: TDD, Code Coverage and Real Time Development 💡

Now it's time to finish the game engine. But now we're getting pretty picky with code coverage, and your implementation must adhere to our policy.

While you're at it, try to add a new script to your package.json file using the options watch and notify from jest. You can check the documentation here. This way you're going to try REAL TIME DEVELOPMENT!

Go for it!

💡 Exercise 3: Continuous Integation and Cndontinuous Delivery 💡

The whole CI magic happens in the file .gitlab-ci.yml. It's already testing, but it could be publishing your new library at the end of the pipeline. Try adding a new step named deploy and running npm publish --access public on it.

Oh, and don't forget to increment your version before doing that, or you'll receive an error.

TIP: Instead of changing your package.json file, try the following command: npm version patch

💡 Exercise 4: Code Smells and Code Quality 💡

What is a code smell? Some signs that our code isn't that good. What are some examples of code smells?

• Giant functions
• A function that takes 8 arguments
• A single file with 4500 lines of code
• Magic Numbers

This list can go on and on, and some code smells are specific to certaing paradigms and languages. Take some time to reflect with your team: what is a code smell to you?

Now, let's automate the code smell detection. Some of these smells can be automated by using JSHint, and that's waht we're going to do!