The original question (
http://stackoverflow.com/questions/43897632/mapped-calls-to-clojurescript-macro)
was about automatically generating callback functions for CLJS. Perhaps I
oversimplified it too much for the example.
Alan
On Thu, May 11, 2017 at 1:55 AM, Dragan Djuric <draga...@gmail.com> wrote:
> What's wrong with (foo :able) => "Adelicious!" and (:able foo) =>
> "Adelicious!"?
>
>
> On Thursday, May 11, 2017 at 9:20:19 AM UTC+2, Alan Thompson wrote:
>>
>> A recent question on StackOverflow raised the question of the best way to
>> automatically generate functions. Suppose you want to automate the creation
>> of code like this:
>>
>>
>>
>> (def foo
>> {:able "Adelicious!"
>> :baker "Barbrallicious!"
>> :charlie "Charlizable"})
>> (def bar
>> {:able "Apple"
>> :baker "Berry"
>> :charlie "Kumquat"})
>>
>> (defn manual-my-foo [item] (get foo item))
>> (defn manual-my-bar [item] (get bar item))
>>
>> (manual-my-foo :able) => "Adelicious!"
>> (manual-my-bar :charlie) => "Kumquat"
>>
>>
>> You could write a macro to generate one of these at a time, but you can't
>> pass a macro to a higher-order function like `map`, so while this would
>> work:
>>
>>
>> (generate-fn :foo) ;=> creates `my-foo` w/o hand-writing it
>>
>>
>> this wouldn't work:
>>
>>
>> (map generate-fn [:foo :bar :baz])
>>
>> While one could write a 2nd macro to replace `map`, this is a symptom of
>> the "Turtles All the Way Down" problem. One workaround is to avoid macros
>> altogether and use only functions to generate the required `my-foo` and
>> `my-bar` functions. The trick is to make use of the built-in Clojure
>> function `intern` both to save the newly generated functions into the
>> global environment and to retrieve the pre-existing maps `foo` and `bar`.
>> Full details are available Q&A-style at the StackOverflow post
>> <http://stackoverflow.com/questions/43904628/how-to-create-clojure-defn-functions-automatically/43904717#43904717>
>> .
>>
>> Enjoy,
>> Alan
>>
>> --
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