Re: How do I determine if a function is defined?

[Clinton Ebadi]

On Sunday 28 April 2002 14:05, Bruce Korb wrote:
> Hi,
>
> I keep trying obvious things, like:
>
>   (if (function? mumble) (mumble))
>
> and get:
>
>   ERROR: Unbound variable: mumble
>
> and then it dies.  I just want to do one thing if it is
> a function and another if it is either undefined or even
> anything else.  How to do that seems completely non-obvious.
> Thank you.

Try (if (procedure? 'mumble) (mumble)). Remember to quote the variable you 
want to test!