Optimistic Updates in React: UX That Feels Instant

Optimistic updates are a powerful technique in building user-friendly and responsive web applications, especially when using libraries like React Query or SWR. This approach enhances the user experience by immediately reflecting changes locally before confirming them on the server. However, it's crucial to implement optimistic updates carefully to avoid potential pitfalls.

Key Concepts

• Optimistic Update: When a client-side change is applied instantly without waiting for the server response.
• Snapshotting: Taking a copy of the current state before making any changes.
• Rollback: Reverting to the previous state if an error occurs during the update process.
• Server Sync: Ensuring that local updates eventually sync with the server.

Implementation Patterns

React Query Example

javascript
 
1import { useMutation } from 'react-query';
2
3const addTodo = async (newTodoText) => {
4  // Server API call to create a new todo
5};
6
7const useTodos = () => {
8  const queryClient = useQueryClient();
9
10  const { mutate: addTodoMutate, isLoading } = useMutation(addTodo, {
11    onMutate: async (newTodoText) => {
12      await queryClient.cancelQueries(['todos']); // Cancel any ongoing queries
13
14[Read the full article at DEV Community](https://dev.to/whoffagents/optimistic-updates-in-react-ux-that-feels-instant-2k31)
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