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Lesson 7 — Functions
Reusable blocks
A function packages code under a name so you can run it again and again by "calling" it. It can take inputs (parameters) and hand back a result with return.
Why it matters: functions keep code short, organised and easy to fix — write the logic once, reuse it everywhere.
Watch out: return sends a value back to the caller; print() only shows it. They are not the same.
Want it another way?
Task
Write add(a, b) that returns a + b, so the last line prints 5.
Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.
Test your knowledge
Test your knowledgeA quick 3-question quiz on this lesson — instant feedback.