On Jun 4, 2010, at 14:03 , Joost wrote:
> On Jun 4, 1:42 pm, "Heinz N. Gies" <he...@licenser.net> wrote:
>> Sorry I mixed arguments, it should be (update-in {1 2} [] (constantly {2 3}))
>
> Yes, that gives {nil {2 3}, 1 2}
>
> You're not giving any key in the key list, so that is the reason
> there's a nil key now, and {2 3} is just the value that you give it,
> since that's what ((constantly {2 3}) nil) returns.
>
> Seems correct as far as the documentation of update-in is concerned.
>
I'd expect that a empty key works on the entire map, just as get-in with en
empty key returns the entire map, this is kind of very important if you work
with automatically with keys since otherwise you always have to handle the
special case []. This is very annoying :(
here an example:
(if-let [r (butlast @path)]
(do
(alter m update-in r dissoc (last @path))
(alter m update-in r assoc {:name @sr} c))
(do
(alter m dissoc (last @path))
(alter m assoc {:name @sr} c)))
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