Are you sure you want to return:
[ [ { :id 1 :text "foo" } { :id 2 :text "bar" :ack 5 } ] [ { :id 3
:age 12 :somethingElse 29 } ] ]
(notice the two nested vectors), or rather
[ [ { :id 1 :text "foo" } { :id 2 :text "bar" :ack 5 } { :id 3 :age 12
:somethingElse 29 } ] ]
Lucas
On 26 January 2015 at 13:10, Josh Stratton <strattonbra...@gmail.com> wrote:
> I'm new to clojure and FP in general. One thing that has always been a
> little confusing for me is working with immutable trees. I have a vector of
> categories, each category containing a vector of items--each one a hashmap.
> In that hashmap I have a bunch of attributes including an item-id. Now,
> assuming I have an item id, what's the easiest way to update the appropriate
> hashmap? I can't use an assoc, I believe, because my data is in a
> vector--not keyed by the id.
>
> What I have been doing is writing a function that maps the categories to new
> categories and then write another function that is called on every item and
> updates it iff the item id matches. This works, but it seems really clunky
> and I'm assuming there's a simpler way to do it.
>
> ; categories is a vector of item vectors, where the item is a hash
> (def categories [ [ { :id 1 :text "foo" } { :id 2 :text "bar" :ack 5 } ] [ {
> :id 3 :age 7 } ] ])
>
> Is there a more elegant workflow for updating categories? Let's say I want
> to update item of id 3 with { :age 12 :somethingElse 29 }, what's the
> easiest way to do this?
>
> ; so the return would be
> [ [ { :id 1 :text "foo" } { :id 2 :text "bar" :ack 5 } ] [ { :id 3 :age 12
> :somethingElse 29 } ] ]
>
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