" I get a typical clojure-y set of data fairly deeply nested data
structures that I have yet to master with respect to traversing using
basic clojure operations"
You get an arbitrarily nested Clojure, not Clojure-y, data structure
precisely because those maps, lists, and sets suffice in 99% of cases and
the language has probably the best set of functions (including those data
structures themselves!) for working with them of any language out there.
Honestly, Clojure's data structures and the suite of polymorphic functions
that go with them are kind of the whole point of the language. Just keep
practicing using them.
2 maps, a flatten, a select-keys, and....data...
(->> (describe-instances)
:reservations
(map :instances)
flatten
(map #(select-keys % [:instance-id :instance-type
:public-ip-address]))) ;; whatever other keys you're interested in
On Wednesday, March 12, 2014 4:13:06 AM UTC-7, Dave Tenny wrote:
>
> If I do something like a describe-instances call in amazonica, I get a
> typical clojure-y set of data fairly deeply nested data structures
> that I have yet to master with respect to traversing using basic clojure
> operations.
>
> Given a result that basically ends up looking like pages of interleaved
> maps and arrays, what should I be using to pick out
> nested key/value information?
>
> {:reservations [{:reservation-id "r-3da23a55",
> ... pages of output ...
> }]}]}]}
> user=>
>
> 'get-in' won't do it because of the arrays (or PersistentArrayMaps, as the
> case may be).
> I was hoping to avoid zippers, but maybe that is the idiomatic way to do
> it, I don't know.
>
> What's the easy way to traverse these things? This is a very common data
> pattern in using clojure to access everything from html content to AWS data.
> I just want to pluck out the :instance k/v information in the nested
> morass of data printed at my REPL but I haven't yet found the intuitive and
> idiomatic way to do it.
>
>
>
>
>
>
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