Professional Scala
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REPL

Another tool that we will frequently use is REPL (Read Eval Print Loop). It is often used for quickly evaluating Scala expressions.

From sbt, we can enter REPL mode with the help of the sbt console command. Let's try some simple expressions.

Now, we'll look at how to evaluate expressions. Follow these steps to do so:

  1. Open the sbt tool.
  2. Open REPL by typing the following command: 
    sbt console
  3. Type the following expressions and press Enter:
    • 2 + 2
    • "2" + 2
    • 2 + "2"
    • (1 to 8).sum
    • java.time.LocalTime.now()

Please note that we can have an interactive Scala playboard inside IDE by creating a special file type: a Scala Worksheet. It's useful, but is mainly for demonstration purposes.

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