On Feb 3, 6:41 pm, Tayssir John Gabbour <[email protected]>
wrote:
> ;; Works, but is ugly.
> (let [xset #{{:a 1, :b 1, :c 1}
> {:a 2, :b 2, :c 2}
> {:a 3, :b 3, :c 3}}]
> (project (select #(= (:a %) 1) xset)
> [:b :c]))
>
> So what I currently do is this:
>
> ;; Works, with a little blemish.
> (-> #{{:a 1, :b 1, :c 1}
> {:a 2, :b 2, :c 2}
> {:a 3, :b 3, :c 3}}
> ((revargs select) #(= (:a %) 1))
> (project [:b :c]))
>
> And I'm curious whether there's a better way.
Two, I won't say better - just different, ways:
(defn select*
[xset pred]
(select pred xset))
then use select* in place of select.
OR
(-> #{{:a 1, :b 1, :c 1}
{:a 2, :b 2, :c 2}
{:a 3, :b 3, :c 3}}
(->> (select #(= (:a %) 1)))
(project [:b :c]))
=> #{{:c 1, :b 1}}
Walt
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