React Js Tutorial Step By Step for Beginners In 2023

react js tutorial step by step for beginners : React is a JavaScript library for building user interfaces. It allows developers to create reusable UI components and manage the state of their applications in an efficient way.

React uses a virtual DOM to update the UI components efficiently, making it highly performant even for large scale applications. React follows a component-based architecture and follows unidirectional data flow to update the components.

React JS Tutorial for Beginners

React is a JavaScript library for building user interfaces. It was developed and maintained by Facebook and is now used by many companies and organizations worldwide.

React makes it easy to build reusable UI components and manage the state of your application. This tutorial will give you a step-by-step introduction to React and help you build your first React application.

What is React JS?

React is a JavaScript library that allows developers to build dynamic and responsive user interfaces. It was first introduced by Facebook in 2011 and has since become one of the most popular libraries for building web applications.

React is designed to work with other libraries and frameworks, making it a great choice for building modern web applications.

Why React?

React is a great choice for building user interfaces because it makes it easy to build reusable components. A component is a piece of code that can be used to create a specific UI element, such as a button, a form, or a navigation menu. Components make it easy to build complex user interfaces by breaking them down into smaller, reusable parts.

React also makes it easy to manage the state of your application. The state is an object that contains the data that your application needs to render its user interface. By using React’s state management features, you can ensure that your application is always in a consistent state, even as the data changes over time.

React js tutorial step by step for beginners Start

Getting Started with React

To get started with React, you will need to have a basic understanding of HTML, CSS, and JavaScript. You will also need to have a code editor installed on your computer. In this tutorial, we will be using Visual Studio Code, but you can use any code editor that you prefer.

Creating a React Project

The first step in creating a React project is to create a new directory for your project. In your code editor, open a new terminal window and navigate to the directory where you want to create your project. Then, run the following command to create a new React project:

npx create-react-app my-first-react-app

This command will use the create-react-app tool to create a new React project in a directory called my-first-react-app. This directory will contain all the files that you need to build your first React application.

Once the project has been created, navigate to the project directory by running the following command:

cd my-first-react-app

Next, run the following command to start the development server:

npm start

This command will start a development server and open your browser to http://localhost:3000. You should see a “Welcome to React” message in your browser.

react js tutorial step by step for beginners

Understanding the React Components

In React, a component is a piece of code that can be used to create a specific UI element. Components can be thought of as custom HTML elements that you can reuse throughout your application. There are two types of components in React: functional components and class components.

Functional Components

Functional components are simple JavaScript functions that return a React element. They are the easiest and most straightforward way to create a component in React. Here is an example of a functional component:

import React from 'react';

function MyButton() {
  return (
    <button>Click Me!</button>
  );
}

In this example, the MyButton component is a simple function that returns a button element. To use this component in your application, you can import

react js tutorial step by step for beginners

React Js Example

Here’s an example of a simple React component that displays a list of items:

import React from 'react';

function ItemList(props) {
  return (
    <ul>
      {props.items.map((item, index) => (
        <li key={index}>{item}</li>
      ))}
    </ul>
  );
}

export default ItemList;

In this example, the ItemList component takes in a props object that contains an array of items. The component uses the map function to loop over the items and create a list item for each item in the array. The key prop is used to give each list item a unique identifier, which is necessary for React to update the list efficiently.

To use this component in another component, you can import it and use it like this:

import React from 'react';
import ItemList from './ItemList';

function App() {
  const items = ['Item 1', 'Item 2', 'Item 3'];

  return (
    <div>
      <ItemList items={items} />
    </div>
  );
}

export default App;

In this example, the App component uses the ItemList component to display a list of items. It passes the items array as a prop to the ItemList component, which then uses the map function to render the list of items.

react js tutorial step by step for beginners End here

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