REACT MASTER CLASS /// CUSTOM HOOKS /// REUSE LOGIC /// ABSTRACTION /// REACT MASTER CLASS /// CUSTOM HOOKS /// REUSE LOGIC ///

React Custom Hooks

Abstract away complex stateful logic. Keep your components clean, declarative, and highly reusable.

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A.D.A:Welcome to Custom Hooks. In React, we often find ourselves writing the same stateful logic across multiple components, like fetching data or managing a toggle state.


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Concept: Custom Hooks

A custom hook is a standard JS function that starts with use and abstracts away React hooks logic (useState, useEffect, etc).

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What is the primary purpose of a custom hook?

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React Custom Hooks

Author

Pascual Vila

Senior Developer // Code Syllabus

Building custom hooks lets you extract component logic into reusable functions. It's React's primary mechanism for logic composition and code sharing.

Why Custom Hooks?

Historically, React used Higher-Order Components (HOCs) or Render Props to share logic. Hooks simplified this. When you have stateful logic (using useState or useEffect) that needs to be used in multiple components, you abstract it into a Custom Hook.

The "use" Convention

A custom Hook is a JavaScript function whose name starts with ”use” and that may call other Hooks. This convention is crucial. Without it, React's linters wouldn't be able to enforce the Rules of Hooks (like not calling hooks conditionally).

Logic vs State Sharing

Do multiple components using the same hook share state? No. Custom Hooks are a mechanism to reuse stateful logic, not the state itself. Every time you use a custom Hook, all state and effects inside of it are fully isolated.

Common Use Cases:
  • useFetch for API calls.
  • useLocalStorage to sync state with the browser's storage.
  • useWindowSize for responsive rendering logic.
  • useDebounce to delay effect execution.

Hook Glossary

Custom Hook

A JavaScript function starting with 'use' that encapsulates and shares stateful logic.

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Rules of Hooks

Hooks must only be called at the top level and only from React function components or custom hooks.

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use Prefix

The mandatory naming convention that allows React linters to verify hook usage.

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State Isolation

Calling a custom hook multiple times creates independent state for each call.

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Composition

Building complex behavior by combining multiple custom hooks together.

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Abstraction

Hiding complex implementation details (like fetch/effects) behind a simple function interface.

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