If This, Then That

Conditions and while loops

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• An if block runs only when its condition is true; else covers the other case.
• A while loop repeats until its condition becomes false.
• A loop whose condition never changes runs forever.

Steps

1. A robot with sensors
2. One program, two grids
3. Which branch runs?
4. While loops
5. Any length of corridor
6. Follow the path
7. A fork in the road