Try it Editor: JavaScript Arrays 2

Edit This Code :


<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Arrays</h2>

<p>If you use a named index when accessing an array, JavaScript will redefine the array to a standard object, and some array methods and properties will produce undefined or incorrect results.</p>

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

<script>
var person = [];
person["firstName"] = "John";
person["lastName"] = "Doe";
person["age"] = 46; 
document.getElementById("demo").innerHTML =
person[0] + " " + person.length;
</script>

</body>
</html>

Result :