On Wed, Mar 21, 2012 at 5:00 PM, Leandro Oliveira <lolive...@gmail.com> wrote:
> Hi all,
>
> I have a set of hash like this:
>
> #{{:id 1, :foo "bar"} {:id 2, :foo "car"}}
>
> and I'd like to remove an item based on its id value.
>
> Unfortunately, disj requires that I pass the whole map as key to remove it.
>
> Can I remove the map from the set only using the id?
>
> My intention is to avoid a lookup on set to get the whole map back.
>
> Any suggestions?
The only way immediately apparent to me is (into #{} (remove #(= :id
foo) input-set)), but that iterates over the whole set. You could stop
when :id foo got hit by using a loop/recur, and save half the
iterations on average.
I suggest a redesign instead: replace the set with a map. Your example
above would become:
{1 {:id 1, :foo "bar"}, 2 {:id 2, :foo "car"}}
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