DeepSite - 🧬 RemixLearn to build reusable, composable hooks that will elevate your React applications to the next level.
import { useState, useEffect } from 'react';
function useLocalStorage(key, initialValue) {
const [value, setValue] = useState(() => {
const stored = localStorage.getItem(key);
return stored ? JSON.parse(stored) : initialValue;
});
useEffect(() => {
localStorage.setItem(key, JSON.stringify(value));
}, [key, value]);
return [value, setValue];
}Structured learning paths to help you master custom hooks from fundamentals to advanced patterns.
Learn the core concepts of creating and using custom hooks in React applications.
Explore advanced patterns like hook composition, factory hooks, and context integration.
Build practical hooks for authentication, API calls, animations, and more.
Learn how to create a powerful data fetching hook that handles loading states, errors, and caching automatically.
function UserProfile({ userId }) {
const { data, loading, error } = useFetch(
`https://api.example.com/users/${userId}`
);
if (loading) return <Spinner />;
if (error) return <Error message={error} />;
return (
<div>
<h2>{data.name}</h2>
<p>{data.email}</p>
</div>
);
}Loading user data...
Deep dives into custom hook concepts and best practices.
Learn how to create secure authentication hooks for your React applications that handle login, logout, and session management.
Optimize your React apps with custom hooks that help identify and fix performance bottlenecks.
Create responsive experiences with hooks that detect device type, screen size, and orientation changes.
Experiment with custom hooks in real-time. Try our pre-built examples or create your own.
import { useState, useEffect } from 'react';
export function useLocalStorage(key, initialValue) {
// State to store our value
const [storedValue, setStoredValue] = useState(() => {
try {
// Get from local storage by key
const item = window.localStorage.getItem(key);
// Parse stored json or return initialValue
return item ? JSON.parse(item) : initialValue;
} catch (error) {
// If error also return initialValue
console.log(error);
return initialValue;
}
});
// Return a wrapped version of useState's setter function
// that persists the new value to localStorage.
const setValue = (value) => {
try {
// Allow value to be a function so we have same API as useState
const valueToStore =
value instanceof Function ? value(storedValue) : value;
// Save state
setStoredValue(valueToStore);
// Save to local storage
window.localStorage.setItem(key, JSON.stringify(valueToStore));
} catch (error) {
console.log(error);
}
};
return [storedValue, setValue];
}This example demonstrates persisting form input to localStorage.
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