This chapter was interesting because we learned the details of Scala classes and object implementation. We started with what classes means in Scala, how we can declare them, and use them. Then we talked about objects as singleton instances in Scala. We then talked about interesting companion objects, which led us to case classes. We learned that case classes not only give us the conciseness we want but can also be very useful in scenarios where we may want to do pattern matching over instances. Finally, we discussed all the methods and goodies that case classes provide.
In the next chapter, we'll take our knowledge of object-oriented Scala to the next level and talk more about traits, inheritance, and a lot more.