Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>JavaScrip has an built-in function constructor.</p>
<p id="demo"></p>

<script>
var myFunction = new Function("a", "b", "return a * b");
document.getElementById("demo").innerHTML = myFunction(4, 3);
</script>

</body>
</html>