damn, that's true - just "old-fn# ~name" would work :)
On Jan 10, 4:42 pm, Tom Faulhaber <tomfaulha...@gmail.com> wrote: > Yup, this version would cover most cases in a simpler way. My goal > (for no particular reason except it entertained me) was to make > something that worked as much like defn as possible. Most of the > complexity is because of handling the possible combinations of arities > that we might see as a result: I need to "fill in the holes" with > proxies (though I could have wrapped with an if as well). > > extend-fn is also a much better name. > > I'm amused that you did the same thing I did before I realized it was > silly: "old-fn# (var-get (var ~name))" can just be "old-fn# ~name". > (It's like "use" and "utilize" one of my pet peeves in English.) > > Tom > > On Jan 10, 1:03 am, Amit Rathore <amitrath...@gmail.com> wrote: > > > > > Here's some (simpler?) code that will work for adding arity to > > existing functions -http://gist.github.com/273401 > > > It doesn't handle adding variable-arity (ie multiple arity using &) to > > existing functions, but can add specific arity to existing varibale- > > arity functions > > It also doesn't handle adding more than one arity at a time, but you > > can call it multiple times with different arity to get the same > > effect. See example below - > > > An example to add arity - > > > user> (extend-fn keyword [ns name suffix] > > (keyword ns (str name "-" suffix))) > > > user> (extend-fn keyword [ns prefix name suffix] > > (keyword ns (str prefix "-" name "-" suffix))) > > > Here's the example usage - > > > user> (keyword nil "hello") > > :hello > > > user> (keyword nil "hello" "more") > > :hello-more > > > user> (keyword nil "oh" "hello" "more") > > :oh-hello-more > > > Again, like Tom said, dunno why you'd need to do this... > > > On Jan 9, 10:45 pm, Tom Faulhaber <tomfaulha...@gmail.com> wrote: > > > > Actually this is possible. (seehttp://xkcd.com/386/) > > > > See the macro add-arity which I've put up > > > here:http://gist.github.com/273349 > > > > This allows you to do things like: > > > > user> (add-arity keyword [ns name suffix] (keyword ns (str name "-" > > > suffix))) > > > #<user$eval__6304$fn__6309 user$eval__6304$fn__6...@5d8e63> > > > > user> (keyword nil "hello" "more") > > > :hello-more > > > > The code I put up will handle (I think) all sorts of variations of arg > > > counts: you can use add-arity just like defn and it will grab any > > > specified arglists (including arglists with &) and proxy the others > > > back to the original function. It doesn't do anything with metadata, > > > though. Also, you can override a given arity on the original function, > > > but you can't then call the original version at that arity. > > > > Whether this is a good idea or not is a completely different > > > question :-) > > > > Tom
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