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 account = {id: 42,show() { console.log(this.id); }};account.show();
Keep the experiment focused on understanding this in different contexts and change one assumption at a time.
Keep the experiment focused on understanding this in different contexts and change one assumption at a time.
A common failure with understanding this in different contexts is changing several variables at once. That hides which rule actually caused the result.
Finish the lesson once you have worked through the material. This awards ★ 20 XP.