如何解决将地图列表转换为Clojure中的地图
我是Clojure和编程的新手,我想知道如何解决这个问题。
我导出了以下地图列表
({:name "Bob",:occupation "Senior salesman",:work-department "Sales"}
{:name "Sharon",:occupation "Executive",:work-department "Sales"}
{:name "Donald",:occupation "Customer Support agent",:work-department "Client services"}
{:name "Catherine",:occupation "Technical Lead",:work-department "Engineering"})
如何将其从地图列表转换为以下样式的地图?
{:sales
{:name "Bob"
:occupation "Senior salesman"}
:sales
{:name "Sharon"
:occupation "Executive"}
:client-services
{:name "Donald"
:occupation "Customer Support agent"}
:engineering
{:name "Catherine"
:occupation "Technical Lead"}}
感谢您的帮助
解决方法
在这种情况下,您可能会发现group-by功能很有用。假设我们将您的地图列表定义为“之前”
> before
({:name "Bob",:occupation "Senior salesman",:work-department "Sales"}
{:name "Sharon",:occupation "Executive",:work-department "Sales"}
{:name "Donald",:occupation "Customer Support agent",:work-department "Client services"}
{:name "Catherine",:occupation "Technical Lead",:work-department "Engineering"})
然后分组依据将生成一个从键到具有该键的项目列表的映射:
> (group-by :work-department before)
{"Sales"
[{:name "Bob",:work-department "Sales"}
{:name "Sharon",:work-department "Sales"}],"Client services"
[{:name "Donald",:work-department "Client services"}],"Engineering"
[{:name "Catherine",:work-department "Engineering"}]}
如果您希望输出平面结构,则可以像这样转换每个条目:
> (map (fn [e] [(:work-department e) (dissoc e :work-department)]) before)
(["Sales" {:name "Bob",:occupation "Senior salesman"}]
["Sales" {:name "Sharon",:occupation "Executive"}]
["Client services"
{:name "Donald",:occupation "Customer Support agent"}]
["Engineering" {:name "Catherine",:occupation "Technical Lead"}])
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