DEMO: This demo shows how you can increment (increase) a variable's value repeatedly inside a loop!

Using += or -= in a loop increases or decreases a variable's value by a set amount each time the loop runs.

• Click Run and watch the code in the code editor run. Then, follow along through the demo that explains it!
• Take a close look at the code on the stage and in the code editor. Do you see where += is used?

To navigate the page using the TAB key, first press ESC to exit the code editor.