How to create components in ReactJS

2. How to create components in ReactJS? • React uses this JSX format so that we can put HTML and JavaScript together. So, in this article, we will see how to create components in ReactJS. • React components can be defined anywhere in your ReactJS project. Also, it can be used anywhere in your ReactJS project. There are two ways to define components in ReactJS. Both are used by a wide range of programmers. But with the APIS/HOOKs like useState, use context the functional components are becoming more and more popular. There are two types of components:

3. React functional components • React class-based component 1) React Functional Components: This component can be any JavaScript function that returns the HTML. These functional components can also accept “props”, meaning properties or data. As these are JavaScript functions or extensions of JavaScript functions, they can also be created from the ES6 convention of the arrow function. These functional components can also accept the props that we can use using JSX syntax and you can also put your normal JavaScript code before the return statement. One thing to notice is that there should only be one return per component.

4. Syntax: const Greet = (props) => { const person = props.name; return ( <div> <h1>Hello {person}!!</h1> </div> ) }

5. 2) React Class-based Components: • The class-based components also have almost the same features as React function components. but before we define our class-based component, we need to import the “React. Component” or extract the Component like “{Component}” from React. import React, {Components} from 'react';

6. Syntax: import React, { Component } from 'react' class App extends Component { render() return ( <div> <h1>Hello {this.props.name}</h1> </div> ) } }

7. Rendering the Component: • We have successfully made the components, but in order to use them we need to render them. one can first export their components and can use them anywhere in the ReactDOM.render method after importing them. Somewhere in your project in ReactDOM.render(). ReactDOM.render( <React.StrictMode> <Greet name="gfg " /> </React.StrictMode>, document.getElementById('root') );

8. Creating React Application: 1) Create a React application using the following command: npx create-react-app foldername 2) After creating your project folder i.e. folder name, move to it using the following command: cd foldername

9. Now have a component named “Card” in your App.js. We are going to use this component later. This component accepts two arguments/data of “writer” and “receiver”. Then we have one return which just uses this data of writer and receiver and displays it on a card. After that, we have made another component named App which will be used to hold all the components for our Application. This App has an export default so that we can use it anywhere in our React App. Hence, we do not have to render it manually. This App is automatically rendered in your index.js while creating a react app using npx.

10. import React from "react"; function Card({ receiver, writer }) { return ( <div> <h1 style={{ backgroundColor: "lightblue", width: "fit-content" }}> BOSC Tech Labs </h1> <h2 style={{ backgroundColor: "lightgrey", width: "fit-content" }}>

11. We are a team of innovative and passionate engineers who transform your idea into reality. </h2> <h3>Your truly, Mr. Nick</h3> </div> ); } export default function App() { return ( <div> <Card writer="GFG" receiver="gfgjr" /> </div> ); }

12. npm start • Run the application using the following command from the root directory of the project: • Now open your browser and go to http://localhost:3000/, you will see the following output:

13. Conclusion: • So, in this article, we have been through how to create components in ReactJS. Also, feel free to comment with your suggestions and feedback on the post. Moreover, at BOSC Tech Labs, we have a team of highly experienced React JS developers. They can assist you in developing your customized web app. So contact us to hire experienced ReactJS developers. • Article Source: https://bosctechlabs.com/create-components-in-reactjs/