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# Prototype keys() Method

This method returns an Array of all keys for the hash.

## Syntax:

    hash.keys()  ;

## Return Value :

- Returns an array of the strings having all the keys of the hash.

## Example:

    <html>
    <head>
    <title>Prototype examples</title>
    <script type="text/javascript"
       src="/javascript/prototype.js">
    </script>
    <script>

    function showResult(){

      var h = $H({ name: 'Prototype', version: 1.6 });
      var arr = h.keys();

      arr.each(function(item) {
          alert(item );
       });

    }

    </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.

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