Using reactive variables with Apollo Client

State management is crucial for modern web applications, and Apollo Client provides a streamlined solution for managing both local and remote state in client-side applications. By leveraging features like reactive variables and field policies introduced in Apollo Client 3, developers can handle local state with a single API, enhancing control and flexibility without necessitating GraphQL operations. Reactive variables allow for reading and modifying local data, with automatic detection of changes that trigger updates across the application, ensuring seamless real-time UI updates. The useReactiveVar hook further integrates reactive variables with React components, promoting efficient re-renders upon state changes. Additionally, field policies enable precise control over how data is read and written to the Apollo Client cache, allowing for client-side query resolution with the @client directive. Overall, Apollo Client's reactive variables and field policies present a powerful, flexible approach to managing complex client-side state, which is increasingly vital as web applications grow in complexity.