A structured lesson workspace with readable content, hands-on examples, and a clean path to completion.
| Observation | Diagnostic question |
|---|---|
| Runtime value | What value actually arrived? |
| Language rule | Which rule determines the result? |
const projectName = 'atlas';let completed = 0;completed += 1;console.log(projectName, completed);
Keep the experiment focused on variables with let, const, and var and change one assumption at a time.
Keep the experiment focused on variables with let, const, and var and change one assumption at a time.
Mentor note: for variables with let, const, and var, name the invariant you need before reaching for a clever shortcut. Clear state and explicit assumptions make later debugging much cheaper.
Finish the lesson once you have worked through the material. This awards ★ 20 XP.