Scratch · Lesson 4

Loops

Repetition, the first real abstraction students meet, and the concept that unlocks everything after.

What you will cover

Repeat, forever, and repeat-until — and when each is correct
Nested loops and the patterns they produce
Recognizing when duplicated blocks should become a loop
Infinite loops: why they freeze a project and how students diagnose it
Connecting loops back to pattern recognition from Module 1