在Clojure中，如何选择并返回集合的子集

Question

如果我有这样的收藏

Diters

如何制作函数，使其仅返回{{:A "a" :B "b"} {:A "a" :B "Goal" } {:A "a" :B "Goal"}} 的部分？仅含义：

:B "Goal"

Answer 1

我修复了您的数据，使其成为3张地图的矢量。

(def data [{:A "a" :B "b"}
           {:A "a" :B "Goal"}
           {:A "a" :B "Goal"}])

(defn b-goal?
  [item]
  (= (:B item) "Goal") )

(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})

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