Prototype unset() Method


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This method deletes the hash key's 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>

To understand it in better way you can Try it yourself.


prototype_hash_processing.htm

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