Chapter 2. The core rules


In this chapter
  • Using the Scala Read Eval Print Loop
  • Expression-oriented programming
  • Immutability
  • The Option class


This chapter covers a few topics that every newcomer to Scala needs to know. Not every topic is covered in depth, but we cover enough to allow you to explore the subject. You’ll learn about the Read Eval Print Loop and how you can use this to rapidly prototype software. Next we’ll learn about expression-oriented programming, and how to look at control flow in a different light. From this, we’ll spring into immutability and why it can help to greatly simplify your programs, and help them run better concurrently.

2.1. Learn to use the Read Eval Print Loop (REPL)

Scala provides many materials to ...

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