Introduction to Recoil

What is Recoil?

Recoil is a state management library for React applications that provides a simple and efficient way to manage state across components. It allows for derived state and asynchronous querying, making it easier to manage complex state logic.

Key Concepts

• Atoms: Units of state that can be read from and written to from any component.
• Selectors: Pure functions that can compute derived state or perform asynchronous queries.
• RecoilRoot: A context provider that must wrap the parts of your app that use Recoil.

Installation

npm install recoil

yarn add recoil

Basic Usage

Here’s a simple example to demonstrate how to use Recoil in a React application:

import React from 'react';
import { RecoilRoot, atom, useRecoilState } from 'recoil';

// Step 1: Define an atom
const textState = atom({
    key: 'textState', // unique ID (with respect to other atoms/selectors)
    default: '', // default value (aka initial value)
});

// Step 2: Create a component that uses the atom
function TextInput() {
    const [text, setText] = useRecoilState(textState);

    return (
        

             setText(e.target.value)}
            />
            
Current Text: {text}
        
    );
}

// Step 3: Wrap your app with RecoilRoot
function App() {
    return (
        
            
        
    );
}

export default App;

Best Practices

• Keep atoms small and focused to avoid unnecessary re-renders.
• Use selectors for derived state instead of duplicating logic across components.
• Group related atoms together for better organization.

FAQ