Clojure 幽灵 : how to find map keys that have specific value?

Question

例如在 map 中:

{"test-1" 23,
 "test-2" 456,
 "test-3" 23}

如何找到具有值 23 的键？

Answer 1

我认为您不需要幽灵来做到这一点，只需按值过滤即可。 IE:

(->> {:key-1 10
      :key-2 20
      :key-3 10}
      (filter (fn [[k v]] (= v 10)))
      (map first))
==>  [:key-1 :key-3]

Spectre 的解决方案是:

(keys (specter/setval [specter/MAP-VALS #(not= 10 %)]
                       specter/NONE
                       {:key-1 10
                        :key-2 20
                        :key-3 10}))