Is it possible to check whether a function is a javascript function or a developer defined function?

Posted by Paul on Stack Overflow See other posts from Stack Overflow or by Paul
Published on 2010-04-14T04:19:53Z Indexed on 2010/04/14 4:23 UTC
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Given a function, I'd like to know whether it's a developer-defined function or a function provided by JavaScript engine. Is it possible?

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