This method deletes the hash's key property and returns its value. If it does not find that key in the hash then it does nothing and returns undefined.
Syntax:
hash.unset(key) ;
Return Value :
Returns value of the deleted key.
Example:
<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript"
src="/javascript/prototype.js">
</script>
<script>
function showResult(){
var h = new Hash({ a: 'apple', b: 'banana', c: 'coconut' });
// Returns 'apple'
alert( "h.unset('a') : " + h.unset('a') );
}
</script>
</head>
<body>
<p>Click the button to see the result.</p>
<br />
<br />
<input type="button" value="Result" onclick="showResult();"/>
</body>
</html>