This method reduces arrays: one-element arrays are turned into their unique element, while multiple-element arrays are returned untouched.
array.reduce() ;
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showResult(){ var arr = [10]; alert("Reduced Element : " + arr.reduce()); var arr = [10, 20, 30, 40]; alert("Reduced Element : " + arr.reduce().inspect()); } </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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