Prototype Enumerable size() Method

Syntax:

Iterator.size();

Return Value :

Returns the size of the enumeration.

Example:

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

<script>

function showResult(){

  var arr = $R(1, 10).select(function(n) { return 0 == n % 2; });

  alert("Test 1 : " + $R(1, 10).size() );
  // Returns 10

  alert("Test 2 : " + ['hello', 42, true].size() );
  // Returns 3

  alert("Test 3 : " + $H().size() );
  // Returns 0


}

</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.