| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 1 | Spot the anti-pattern: == everywhere | Patterns & Performance | Multiple choice | Easy |
| 2 | Spot the anti-pattern: var in 2026 | Patterns & Performance | Multiple choice | Easy |
| 3 | Copy or alias? | Patterns & Performance | Multiple choice | Easy |
| 4 | The accidentally quadratic accumulator | Patterns & Performance | Multiple choice | Medium |
| 5 |
| Plain object or Map? |
| Patterns & Performance |
| Multiple choice |
| Medium |
| 6 | Hidden classes: the shape game | Patterns & Performance | Multiple choice | Hard |
| 7 | Four duplicates checks, one is optimal | Patterns & Performance | Multiple choice | Hard |
| 8 | Factory functions vs constructors | Patterns & Performance | Multiple choice | Easy |