Unit 3 of 7
OpenDay 3 — Your core loop works
What you have afterwards: The happy path runs through completely once.
Goal
You build exactly the one chain that defines your app — and nothing beside it.
Understand briefly
The core loop is why someone opens your app at all. It only counts once it runs through completely: from the action to a result people understand. Work with realistic local sample data instead of “test 1” and “test 2” — unrealistic data hides exactly the cases that catch up with you later.
Follow along
Paste this prompt into the AI tool you work with:
This is my core loop: [YOUR FOUR STEPS]
Implement the happy path only:
1. Implement the four steps in order, without error handling for now.
2. Create realistic local sample data — real names, real lengths, real edge cases.
3. Present the final result so a stranger understands it without explanation.
Do not build extra screens, settings or accounts.Build it yourself
Walk the loop yourself three times: once fast, once slowly and once with the most unlikely input you can think of.
Verify
Only tick a box once you have really checked it. These criteria are the only way to finish this unit.
0 of 3 confirmed
Still open: 3 criteria
Self-check
Three questions about decisions you made today. There are no points and no grade — only the why. Every answer can be changed.
0 of 3 answered
Next step
Tomorrow you take care of everything that is not the happy path.
Next: Day 4 — Your app survives bad days too