Promise Cleanup with .finally()
Promise.finally() is the `try...catch...finally` for async code, guaranteeing logic runs after a promise settles. Use it to hide a loading spinner or close a network connection without duplicating code in `.then()` and `.catch()`.
Promise.finally() acts like the `finally` block in a `try...catch` statement, but for async operations. It schedules a function to run once a promise is settled, whether fulfilled or rejected. This is ideal for cleanup actions like turning off a loading indicator or closing a database connection, avoiding duplicate logic in both `.then()` and `.catch()`. The key footgun: the callback receives no arguments and its return value is ignored, preserving the original promise's outcome.
Read the original → developer.mozilla.org
- #javascript
- #promises
- #async
- #typescript
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