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Intellij IDEA lets you create a Scala worksheet that enables you to evaluate your Scala code results in a special view of the Scala editor.

1. Creating Scala Worksheet

To create a Scala Worksheet, right-click on your project and select

{span:class=shortcut}New{span}

→

{span:class=shortcut}Scala Worksheet{span}

:

IntelliJ IDEA > Working with Scala Worksheet > crea_worksheet.png

It is recommended to create your worksheet in src directory to simplify an inclusion of the project's classes in the classpath. That might be helpful for testing purposes.

In the New Scala Worksheet window type a name of your Scala worksheet and click

{span:class=shortcut}OK{span}

.

IntelliJ IDEA > Working with Scala Worksheet > new_worksheet_window.png

As a result, a file with .sc extension opens. Now you can enter your code.

2. Running Scala Worksheet

You can enter your code and press IntelliJ IDEA > Working with Scala Worksheet > run_worksheet1.png to see the results. You can clear the

{span:class=shortcut}Make project{span}

check box to improve evaluation performance. In this case, the automatic checking of project's changes is disabled.

IntelliJ IDEA > Working with Scala Worksheet > worksheetcode1.png

The results appear in the view on the right side of your code.

A Scala object could be also evaluated. Let's see the following code and the results:
IntelliJ IDEA > Working with Scala Worksheet > ws_object_evaluation.png

You can fold the output without affecting your code on the left side and expand only that block output that matches a specific statement.

IntelliJ IDEA > Working with Scala Worksheet > blockoutput.png

3. Removing Worksheet's Results

You can remove the worksheet's results easily by pressing IntelliJ IDEA > Working with Scala Worksheet > remove_results_icon.png icon.

4. Copying Actions

You can easily copy your code and evaluation results into one file by clicking IntelliJ IDEA > Working with Scala Worksheet > copy_actions.png icon.

5. Configuring Worksheet Settings

You can configure your worksheet's settings by selecting

{span:class=shortcut}File{span}

→

{span:class=shortcut}Settings{span}

→

{span:class=shortcut}Scala{span}

, on the main menu, and clicking

{span:class=shortcut}Worksheet{span}

tab.

IntelliJ IDEA > Working with Scala Worksheet > worksheet_settings.png

On the Worksheet tab, you can set the length for the line break of your results and the output cutoff limit.
You can also configure in what mode you want to run the worksheet.