Prototype - unset() Method


Advertisements


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>

Output


prototype_hash_processing.htm

Advertisements