Preview:
<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript Arrays</h1>
<h2>The concat() Method</h2>
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<p>The concat() method concatenates (joins) two or more arrays:</p>
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<p id="demo"></p>
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<script>
const arr1 = ["Cecilie", "Lone"];
const arr2 = ["Emil", "Tobias", "Linus"];
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const children = arr1.concat(arr2); 
document.getElementById("demo").innerHTML = children;
</script>
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</body>
</html>
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