Prototype merge() Method

Syntax:

hash.merge(object) ;

Return Value :

Returns the resultant merged 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 });
  h = h.merge({ version: 1.6, author: 'Sam' });

  h.each(function(pair) {
     alert(pair.key + ' = "' + pair.value + '"');
  });

}

</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.