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# Prototype Object extend() Method

This method copies all properties from the source to the destination object. This is used by Prototype to simulate inheritance by copying to prototypes.

## Syntax:

    Object.extend(dest, src);

## Return Value :

- Returns an altered object.

## Example:

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

    <script>

    function showResult(){

       var o1 = { name: 'Prototype', version: 1.5 };
       // An empty object
       var o2 = {};
       var o2 = Object.extend(o2, o1);

       alert( " Value of o2.name :" + o2.name );
       // Returns Prototype

       alert( " Value of o2.version :" + o2.version );
       // Returns 1.5

    }

    </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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