Atomic Optimistic UI with useOptimistic for Multi-Step Transitions

Snippet

Atomic Optimistic UI with useOptimistic for Multi-Step Transitions

Use the useOptimistic hook to provide immediate visual feedback during Server Action execution. This pattern maintains a deterministic sync between the temporary UI state and the eventual server response, enhancing perceived performance.

snippet.js
javascript
const [optimisticState, addOptimistic] = useOptimistic(
  state,
  (currentState, newValue) => ({
    ...currentState,
    ...newValue,
    isPending: true
  })
);

nextjs

Breakdown

useOptimistic(state, reducer)

Hook that manages a temporary state during an async transition.

(currentState, newValue) => ...

The reducer logic that defines how the optimistic update merges with existing state.

isPending: true

Flag used to visually distinguish optimistic data from verified server data.

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Atomic Optimistic UI with useOptimistic for Multi-Step Transitions

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