Instruction: Explain how to create and use custom React hooks in Next.js for managing application state.
Context: This question examines the candidate's proficiency with React hooks and their ability to extend these concepts specifically within a Next.js application for state management.
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Let me clarify the premise here: my goal with custom hooks in a Next.js environment is to share stateful logic and not state itself. This distinction is key. Custom hooks facilitate the use of React's built-in hooks, such as useState, useEffect, or useContext, in a manner that's abstracted away from the component logic, thereby promoting code reuse and simplification.
For instance, suppose we're building a feature for a web application, where we need to fetch, display, and update a list of user profiles. Instead of repeating the fetch logic across different components, we can create a custom hook named useUserProfiles. This hook would encapsulate the logic to fetch and update the profiles using useState to manage the state and useEffect to handle side effects like fetching...