What are the preferred and non-preferred array operations for updating the state?
Assesses fundamental understanding of React conventions, runtime behavior, and memory/performance considerations.
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
The below table represent preferred and non-preferred array operations for updating the component state.
| Action | Preferred | Non-preferred |
| --------- | -------------------- | -------------------------- |
| Adding | concat, [...arr] | push, unshift |
| Removing | filter, slice | pop, shift, splice |
| Replacing | map | splice, arr[i] = someValue |
| sorting | copying to new array | reverse, sort |
If you use Immer library then you can able to use all array methods without any problem.
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.