That's cool, but I may be reading this from a file like json, applying the
change, and writing it back. Changing it to a sorted list would take
linear time anyway, right? And I'd just be writing it back out
immediately. Still this seems like a very clean solution. I'll have to
read up on how update-in syntax with sorted maps. Thanks.
On Wed, Jan 14, 2015 at 10:31 PM, Fluid Dynamics <a2093...@trbvm.com> wrote:
> On Thursday, January 15, 2015 at 1:24:14 AM UTC-5, strattonbrazil wrote:
>>
>> Noob clojure question. I have a list of items and I want to append a
>> subitem to one of them. They're currently unkeyed because I care about the
>> order and it seemed more intuitive that way.
>>
>> (def items [{ :id 1 :subitems [] } { :id 2 :subitems [] }])
>>
>> So let's say I want a new list where the second one has two a new subitem
>> would a map be appropriate, but only operate on the matching id?
>>
>
> Blerk. That's going to be linear time. Why not use sorted-map?
>
> (def items (into (sorted-map) {1 {:id 1 :subitems []} 2 {:id 2 :subitems
> []}))
>
> (defn add-subitem [items id subitem]
> (update-in items [id :subitems] conj subitem))
>
> Now you can just pick the item out you want by its id, without a linear
> search, but they'll still be sorted by id.
>
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