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Prototype Expressing Range
Prototype Ranges represent an interval of values. The preferred way to obtain a range is to use the $R utility function.
You can create a big range of values using a simple syntax as follows:
$R(1, 10).inspect();
$R('a', 'e').inspect();
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This will produce following result:
['1, 2, 3, 4, 5, 6, 7, 8, 9, 10']
['a', 'b', 'c', 'd', 'e']
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The include() Method
This method determines whether the value is included in the range:
Syntax:
Return Value :
- If value is included then returns a true value otherwise false.
Example:
<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript"
src="/javascript/prototype.js">
</script>
<script>
function showResult()
{
alert ( "Test 1 : " + $R(1, 10).include(5));
// Returns true
alert ( "Test 2 : " + $R('a', 'h').include('x'));
// Returns flase
}
</script>
</head>
<body>
<p>Click the button to see the result.</p>
<br />
<br />
<input type="button" value="Result" onclick="showResult();"/>
</body>
</html>
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To understand it in better way you can Try it yourself.
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