React Custom Hooks

Custom hooks in React allow you to encapsulate reusable logic, making your components cleaner and more manageable. They are JavaScript functions that utilise built-in React hooks to provide specific functionality.

Why Use Custom Hooks?

  • Promotes reusability by abstracting common logic.
  • Keeps components focused on rendering rather than handling logic.
  • Makes testing and debugging easier by isolating logic.

Syntax of a Custom Hook

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function useCustomHook(parameters) {
  // Define state variables
  // Implement logic using other hooks (e.g., useState, useEffect)
  // Return the required data or functions
  return { ...dataOrFunctions };
}

Description of the Syntax:

  • function useCustomHook(parameters): Custom hooks are regular JavaScript functions, but their names must start with “use” to follow React’s rules for hooks.
  • State Variables: You can use hooks like useState to manage internal state within the custom hook.
  • Logic: The custom hook encapsulates reusable logic, often involving hooks like useEffect, useReducer, or useRef.
  • Return Value: The hook typically returns an object or array containing the data and functions it provides to components.

Example 1: Fetch Data Hook

Custom hook to fetch data from an API.