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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Arrays</h2>
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<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>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_array_associative_2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:30 GMT -->
</html>
​
​
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