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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <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> </head> <body> <div id="app"></div> <script type="text/babel"> function App() { const array1 = [1, 2, 3]; const array2 = [4, 5, 6]; const concatenatedArray = [...array1, ...array2]; return ( <div> <h1>React Js Concat Array using Spread Operator</h1> <p>Array1: {array1}</p> <p>Array2 : {array2}</p> <p>concatenatedArray : {concatenatedArray}</p> </div> ); } ReactDOM.render(<App />, document.getElementById("app")); </script> </body> </html>