The "delete" operator removes an array element in JavaScript , but oddly does not change the size of the array.

<script type="text/javascript">

var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"];

document.write("Number of days:"+days.length); delete days[4];

document.write("<br />Number of days:"+days.length);

</script>

This produces

Number of days:7

Number of days:7