Implement optimistic UI for a like button with rollback on failure
Tests state management and error recovery in async UIs. A strong answer mutates state instantly, fires the API in parallel, keeps a rollback snapshot, and reverts with a toast on failure. Red flag: waiting for the network or skipping revert logic.
Tests whether you can keep client state consistent during asynchronous mutations. A strong answer covers four steps in order: immediately toggle the like state and increment the count in the store, dispatch the POST request without blocking the UI, preserve the previous state or use a pending-transaction pattern so you can roll back precisely, and catch failures to restore the original values while surfacing a transient error. Red flag: pessimistic updates that wait for the server, or silent failures that leave the UI out of sync.
Read the original → crystallize.com
- #optimistic ui
- #state management
- #frontend architecture
- #error handling
- #async patterns
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