On Feb 3, 10:41 pm, wlr <[email protected]> wrote:
> Can you somehow use ->> ?
>
> user> (->> #{1 2 3 4} (clojure.set/select even?))
> #{2 4}
D'oh, I was terribly unclear. I want to do something neat and pretty
like:
;; Doesn't work!
(-> #{{:a 1, :b 1, :c 1}
{:a 2, :b 2, :c 2}
{:a 3, :b 3, :c 3}}
(select #(= (:a %) 1))
(project [:b :c]))
Unfortunately, that doesn't work -- select expects the relations as
the second param, while project wants it as the first. I can do this,
but it's not so neat:
;; 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.
Thanks,
Tayssir
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