从向量

Question

我有这个字符串向量：

["Color: Black" "Color: Blue" "Size: S" "Size: XS"]

如何获取color和Size的所有值？

例如，输出应该是 ["color" ["Black" "Blue"]]

Answer 1

此解决方案按属性名称（颜色，大小等）拆分每个字符串，组，然后清除预期值：

    user=> (require '[clojure.string :as string])
    nil

    user=> (def attributes ["Color: Black" "Color: Blue" "Size: S" "Size: XS"])
    #'user/attributes

    user=> (as-> attributes x
      #_=>   (map #(string/split % #": ") x)
      #_=>   (group-by first x)
      #_=>   (reduce-kv #(assoc %1 %2 (mapv second %3)) {} x))
    {"Color" ["Black" "Blue"], "Size" ["S" "XS"]}

Answer 2

我宁愿一次性使用reduce（因为它更短，可能更快）：

user> (require '[clojure.string :as cs])
nil

user> (def data ["Color: Black" "Color: Blue" "Size: S" "Size: XS"])
#'user/data

user> (reduce #(let [[k v] (cs/split %2 #": ")]
                 (update %1 k (fnil conj []) v))
              {} data)
{"Color" ["Black" "Blue"], "Size" ["S" "XS"]}