Using the worksheet

IntelliJ offers another handy tool to experiment with the language: the Scala worksheet.

Go to File | New | Scala Worksheet. Name it worksheet.sc. You can then enter some code on the left-hand side of the screen. A red/green indicator in the top right corner shows you if the code you are typing is valid or not. As soon as it compiles, the results appear on the right-hand side:

You will notice that nothing gets evaluated until your whole worksheet compiles.