Prototype - Expressing Range

Quiz

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();

This will produce the following result −

['1, 2, 3, 4, 5, 6, 7, 8, 9, 10']

['a', 'b', 'c', 'd', 'e']

The include() Method

This method determines whether the value is included in the range −

Syntax

Range.include(value);

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>

Output

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