Prototype reduce() Method

Syntax:

array.reduce()  ;

Return Value :

If its one-element array then it turned into their unique element
If its multi-elements array then it remains untouched.

Example:

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

function showResult(){

   var arr = [10];
   alert("Reduced Element : "  + arr.reduce());
   var arr = [10, 20, 30, 40];
   alert("Reduced Element : "  + arr.reduce().inspect());
}

</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.