nodejs/next/posts

The goal of this example is to understand when states and effects happen when changing between different routes that use the same component.

Behavior is follows:

This is likely because in React the state kept in the virtual DOM structure, and identical structure implies identical state. So when we change from post 1 to 2, we still have a Post object, and state is unchanged.

Next if we click:then the count is back to 0. This is because we changed the Post object in the DOM to Index and back, which resets everything.

This example also illustrates how to prevent this from happening with useEffect.

Bibliography: