How to create new elements with React JS mapping props ?

We'll learn how to create new elements in React JS using the map() function and props. It's suitable for both beginners and those looking to improve their React skills. The tutorial offers a step-by-step walkthrough, helping you create adaptable and reusable components by effectively using props and the map() function.

Prerequisites:

• Node JS or NPM
• React JS
• Map()

Following is the example of the map method:

// Sample array
const array1 = [1, 4, 9, 16];
// Pass a function to map
const map1 = array1.map(x => x * 2);
console.log(map1);
// Expected output: Array [2, 8, 18, 32]

Steps to create React Application And Installing Module:

Step 1: Create a React application using the following command:

npx create-react-app foldername

Step 2: After creating your project folder i.e. foldername, move to it using the following command:

cd foldername

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-scripts": "5.0.1",
    "web-vitals": "^2.1.4",
}

Example: Now write down the following code in the App.js file.

import React from "react";

class App extends React.Component {
    getComponent = (arr) => {
        return arr.map((value) => (
            <button
                key={value}
                onClick={() => {
                    alert("button " + value + " is clicked");
                }}
            >
                {value}{" "}
            </button>
        ));
    };

    render() {
        const components = 
            this.getComponent([1, 2, 3, 4, 5]);
        return <div>{components}</div>;
    }
}

export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000