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<!DOCTYPE html> <html> <body> <h1>JavaScript Arrays</h1> <h2>The concat() Method</h2> <p>The concat() method concatenates (joins) two or more arrays:</p> <p id="demo"></p> <script> const arr1 = [1, 2, [3, 4]]; const arr2 = [[5, 6], 7, 8]; const arr3 = arr1.concat(arr2); document.getElementById("demo").innerHTML = arr3; </script> </body> </html>
