Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Functions can be used in expressions.</p>
<p id="demo"></p>

<script>
function myFunction(a, b) {
    return a * b;
}
var x = myFunction(4, 3) * 2;
document.getElementById("demo").innerHTML = x;
</script>

</body>
</html>