<header> <h1>Copy</h1> </header> <body> <script> arr = []; for (let i = 0; i < 5; i++) { arr[i] = []; for (let j = 0; j < 5; j++) { arr[i][j] = (i + 1) * (j + 1); } } alert(arr); const deep = [...arr]; alert(deep); </script> </body>
