| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 1 | Pair sum detection with .some() only | Arrays | Coding | Hard |
| 2 | Matrix validation with .every() | Arrays | Coding | Hard |
| 3 | Function composition with reduceRight | Arrays | Coding | Hard |
| 4 | Rebuild Array.prototype.reduce — holes and all | Arrays | Coding | Hard |
| 5 |
| Arrays |
| Coding |
| Hard |