如何使用sorted-map-by按值对地图进行排序？ [英] How do you use sorted-map-by to sort a map by value?

问题描述

我根本无法理解文档。

我想要一个排序的地图 xxx，该地图根据值对地图进行排序。我该怎么办？

I want a sorted map "xxx", which sorts the map according to the value. How do I do that?

谢谢。

推荐答案

另一种方法是在比较器函数内比较原始地图中的值。

Another way is to compare the values from the original map within the comparer function.

(def my-map {:chad 3 :bob 5 :sammy 4})

;; sort by keys ascending
(into (sorted-map) my-map)
=> {:bob 5, :chad 3, :sammy 4}

;; sort by values ascending
(into (sorted-map-by (fn [key1 key2] (compare (key1 my-map) (key2 my-map)))) my-map)
=> {:chad 3, :sammy 4,  :bob 5}

;; sort by values descending
(into (sorted-map-by (fn [key1 key2] (compare (key2 my-map) (key1 my-map)))) my-map)
=> {:bob 5, :sammy 4, :chad 3}

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