Async Patterns in JavaScript

Sequential Execution Use `for...of` with `await` when order matters. Avoid `forEach` with async callbacks.

Parallel Execution `Promise.all([...])` runs all promises concurrently. Fails fast on first rejection.

Parallel with Tolerance `Promise.allSettled([...])` waits for all promises regardless of outcome. Returns status for each.

Racing `Promise.race([...])` returns the first settled promise. Useful for timeouts.

Error Handling - Wrap async calls in try-catch - Use `.catch()` on promise chains - Create wrapper functions for consistent error handling - Never swallow errors silently