Why would you want to overwrite a function if you need reference to the 
original function? Why not just rename the wrapper function to something else?

Or you could use (source function-name) to get the function body and 
essentially rename the function.

Sent from my iPhone

> On Jan 19, 2019, at 07:50, Janko Muzykant <umr...@gmail.com> wrote:
> 
> Hi,
> 
> Is there an way to replace body of existing (interned) function with own code 
> still being able to call original fn? 
> Suppose, I have a function:
> 
>     (defn fetch-data [arg1 arg2]
>       (db/fetch-data ...))
> 
> I would like to intern a slightly modified version of this fn. Something like 
> this:
> 
>     (defn fetch-data [& args]
>       (let [result (apply original-fetch-data args)]
>         (transform-result result)))
> 
> The problem I see is how to keep the reference to original fetch-data fn 
> (here denoted by original-fetch-data),
> so it could be still called in a altered version of fetch-data function.
> 
> Best,
> JM.
> 
> 
> 
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