如何使用sorted-map-by按值对地图进行排序？

我根本无法理解文档。

我想要一个排序的地图“xxx”，它根据值对地图进行排序。我怎么做？

Thanks.

另一种方法是在比较器函数中比较原始映射的值。

(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}