What is ReactJs?

React is a JavaScriptlibrary for building user interfaces. It allows you to build reusable UI components and manage the state of your application efficiently. Here's a beginner's tutorial for ReactJS using examples:

Setting up a React environment:
To start building with React, you need to set up a development environment. You can do this using tools like CodeSandboxor you can set up a local environment using npm and a text editor like Visual Studio Code.

Creating a React component:
A componentin React is a piece of UI that can be reused multiple times in an application. You can create a component in React using JavaScript functionsor classes. Here's an example of a functional component:

import React from "react";

function MyComponent() {
  return <h1>Hello, World!</h1>;
}

export default MyComponent;

And here's an example of a class component:

import React, { Component } from "react";

class MyComponent extends Component {
  render() {
    return <h1>Hello, World!</h1>;
  }
}

export default MyComponent;

Rendering a component:
To render a component in React, you need to import it into a file and use the <MyComponent /> syntax to render it. Here's an example:

import React from "react";
import MyComponent from "./MyComponent";

function App() {
  return (
    <div>
      <MyComponent />
    </div>
  );
}

export default App;

Props and State:
In React, you can pass data to components using props and manage the state of a component using the state object. Props are properties that are passed to a component from its parent component. The state is an object that holds data that can change within a component. Here's an example:

import React, { useState } from "react";

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>Increment</button>
    </div>
  );
}

export default Counter;

Event handling:
You can handle events in React components using event handlers. An event handler is a function that is executed when an event occurs, such as a button click. Here's an example:

import React, { useState } from "react";

function Toggler() {
  const [isToggled, setToggled] = useState(false);

  return (
    <div>
      <p>Toggled: {isToggled.toString()}</p>
      <button onClick={() => setToggled(!isToggled)}>Toggle</button>
    </div>
  );
}

export default Toggler;

These are the basics of ReactJS. Visit React Docs for more. You can use these concepts to build more complex applications and learn advanced topics as you progress.
Follow @bakardev for more. ✌