A custom Hook is a JavaScript function whose name starts with "use" and that may call other Hooks. Custom hooks allow sharing stateful logic (like window resizing or API fetching) without HOCs.
React Building Custom Hooks
Extract and share stateful logic between components cleanly.
Key Takeaways: React Building Custom Hooks
Mastering React Building Custom Hooks helps you write clean and reliable React code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
React Building Custom Hooks Code Example
Reactimport { useState, useEffect } from "react";
function useWindowWidth() {
const [width, setWidth] = useState(window.innerWidth);
useEffect(() => {
const handleResize = () => setWidth(window.innerWidth);
window.addEventListener("resize", handleResize);
return () => window.removeEventListener("resize", handleResize);
}, []);
return width;
}Output
Custom hook tracks viewport width reactively
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