Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>The constructor property returns the constructor function for a variable or an 
object.</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = 
    "john".constructor + "<br>" +
    (3.14).constructor + "<br>" +
    false.constructor + "<br>" +
    [1,2,3,4].constructor + "<br>" +
    {name:'john', age:34}.constructor + "<br>" +
    new Date().constructor + "<br>" +
    function () {}.constructor;
</script>

</body>
</html>