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# Prototype Enumerable inGroupsOf() Method

This method groups items in fixed-size chunks, using a specific value to fill up the last chunk if necessary.

## Syntax:

    Iterator.inGroupsOf(size[, filler = null]);

## Return Value :

- Returns all the elements for which the iterator returned true.

## Example:

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

    <script>

    function showResult(){

      var students = [
      { name: 'Sunny', age: 20 },  { name: 'Audrey', age: 21 },
      { name: 'Matt', age: 20 },   { name: 'Lodie', age: 26 },
      { name: 'Will', age: 21 },   { name: 'David', age: 23 },
      { name: 'Julien', age: 22 }, { name: 'Thomas', age: 21 },
      { name: 'Serpil', age: 22 }
      ];

      alert ( students.pluck('name').inGroupsOf(4)  ) ;
      // Returns  [ ['Sunny', 'Audrey', 'Matt', 'Lodie'],
      //      ['Will', 'David', 'Julien', 'Thomas'],
      //      ['Serpil', null, null, null] ]
    }

    </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.

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