assoc-in "works" for vectors in the sense that both vectors and maps
implement ILookup (get) and IAssoc (assoc). assoc-in can navigate any
collection that understands "get" (including sets!), and add to any
collection that understands "assoc".
However, assoc-in will *always* create *maps* when it encounters missing
keys. This is unlikely to be what you want most of the time when working
with a vector structure. Examples:
(assoc-in [:a [:b [:c :d] :e]] [1 1 1] :f)
;=> [:a [:b [:c :f] :e]]
(assoc-in [] [0] :a)
;=> [:a]
(assoc-in [] [1] :a)
;IndexOutOfBoundsException clojure.lang.PersistentVector.assocN
(PersistentVector.java:183)
(assoc-in [] [0 0] :a)
;=> [{0 :a}]
(assoc-in [] [0 0 0] :a)
;=> [{0 {0 :a}}]
(assoc-in [] [0 0 1] :a)
;=> [{0 {1 :a}}]
On Thursday, August 6, 2015 at 7:29:04 AM UTC-5, Carl Smotricz wrote:
>
> Dunno if this is the correct place and way to suggest a correction:
>
> Someone just mentioned to me that (assoc-in) seems to only work for maps,
> as the Cheat Sheet section on vectors doesn't mention it. I was able to
> show him otherwise, but maybe this is something the CS should pick up?
>
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