Async tools at your fingertips
Recall which async tool fits sequential, parallel, error-handling, and CPU-heavy Node.js work.
When is plain sequential await the right move? Think dependency. Use sequential await when the next operation needs the previous result or side effect. Example: verify the account before charging the card. Dependency Sequential await versus Promise.all: which fits this shape? Parallelize independent waits, not dependent decisions. Compare Promises make CPU-heavy work non-blocking, right? A teammate wants to wrap a 200 MB JSON transform in Promise.resolve().then(...). Your line A promise changes scheduling, not the cost of JavaScript computation. Move heavy CPU work to a worker, queue, stream, or chunked process. Do not confuse async syntax with free compute. It names…
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