How do streams work in Node.js?
Answer
Streams process data incrementally instead of buffering it all in memory. Readable streams produce chunks, writable streams consume them, and pipe or pipeline connects them with backpressure and error handling.
Context
Node.js is a JavaScript runtime built on V8 that excels at I/O-bound services because one process can coordinate many non-blocking operations. Keep CPU-heavy work off the event-loop thread or move it to workers.
Example
Consider a production Node.js change: define the expected behavior and failure modes first, implement the smallest observable change, then verify it with a focused test or measurement. The right implementation depends on the system boundary and its constraints.
Practical considerations
- Choose the approach from the requirement and constraints, not from habit.
- Include validation, error handling, and cleanup where the boundary requires them.
- Verify the observable result with focused tests or measurement.
Follow-up prompts
- What failure mode would you expect if this were implemented incorrectly?
- How would you test this behaviour?
- What changes when the feature must scale to a larger application or team?
In practice
For this easy-level topic, make assumptions explicit, choose the smallest safe implementation, and verify the behavior at the relevant boundary.