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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