<script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@babel/standalone@7.14.6/babel.min.js"></script>
<script type="text/babel">
const array1 = ['Red', 'Blue', 'Orange'];
const array2 = ['Green', 'Purple', 'Brown'];
const concatenatedArray = Array.from(array1).concat(array2);
<h1>React js Concat Array using Array.from()</h1>
<p>Array1: {JSON.stringify(array1)}</p> <p>Array2 : {JSON.stringify(array2)}</p> <p>Concatenated Array: {JSON.stringify(concatenatedArray)}</p> ReactDOM.render(<App />, document.getElementById("app"));