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# Prototype flatten() Method

This method returns a flat (one-dimensional) version of the array. Nested arrays are recursively injected inline.

This can prove very useful when handling the results of a recursive collection algorithm.

## Syntax:

    array.flatten()  ;

## Return Value:

- Returns a flat ( one - dimensional ) array

## Example:

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

    function showResult(){

       var arr =['frank',['bob','lisa'],['jill',['tom','sally']]];
       // Now flatten this array.
       var newArr = arr.flatten();
       newArr.each(function(item) {
         alert(item);
       });

    }

    </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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