Cheat Sheet
| Question | Core Idea | Senior Signal |
|---|---|---|
| Q146 | JSON safety | Parse can fail, stringify loses types, and parsed data still needs validation. |
| Q147 | Key safety | Use Object.hasOwn, Object.keys, Reflect.ownKeys, Map, and allowlists intentionally. |
| Q148 | Scheduling | Chunk or move heavy work so the main thread can handle input and paint. |
| Q149-Q150 | Config and capstone | Treat config as production data and connect advanced JS topics into runtime reliability. |