This method returns true if obj is an array, false otherwise.
Object.isArray(obj);
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showResult(){ var o1 = [1,2,3,4,5]; var o2 = {name:"prototype", version:1.6}; alert( "Object.isArray(o1): " + Object.isArray(o1) ); alert( "Object.isArray(o2): " + Object.isArray(o2) ); } </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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