Cheat Sheet
| Question | Core Idea | Senior Signal |
|---|---|---|
| Q131 | Date and time | Separate instants, date-only values, local time, and display formatting. |
| Q132 | Intl | Use locale-aware formatters for dates, numbers, currencies, sorting, and relative time. |
| Q133 | Regex | Escape dynamic input and watch for ReDoS or global lastIndex surprises. |
| Q134-Q135 | Precision and URLs | Use safe numeric contracts and platform URL APIs instead of string guessing. |