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<!DOCTYPE html>
<html>
<body>

The constructor property returns the constructor function for a variable or an
object.



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

</body>
</html>

<!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>