React JS is a powerful JavaScript library developed by Facebook for building dynamic and responsive user interfaces. It’s widely used for single-page applications and makes web development faster and easier.
What is React JS?
React is component-based, meaning your UI is divided into reusable pieces. It focuses on building declarative views, ensuring your code is readable and easier to debug. React uses a Virtual DOM, which boosts performance by updating only the necessary parts of the UI instead of the entire page.
Key Features
- JSX : JavaScript XML syntax for writing HTML in JavaScript.
- State and Props : Manage dynamic data and share it between components.
- Component Lifecycle : Control what happens during a component's creation, update, or removal.
- Hooks : Allow you to use state and other React features in functional components.
Practical Example: Creating a Simple Counter
Here’s a simple example for beginners:
import React, { useState } from ‘react’;
function Counter() {
const [count, setCount] = useState(0);
return (
<div>
<h1>Counter: {count}</h1>
<button onClick={() => setCount(count + 1)}>Increase</button>
<button onClick={() => setCount(count – 1)}>Decrease</button>
</div>
);
}
export default Counter;
This code demonstrates how to use hooks like useState to manage data. The counter updates dynamically when you click the buttons.
Why Should Beginners Learn React?
- Easy to Learn: Basic knowledge of JavaScript is enough to start.
- High Demand: Used by top companies like Facebook, Netflix, and Airbnb.
- Large Community: Plenty of resources and support available.
