clojure.core.core。在嵌套地图上

发布于 2025-01-26 20:04:38 字数 348 浏览 2 评论 0原文

在clojure.core.match中，此示例在嵌套地图中效果很好，

(match [{:a {:b :c}}]
  [{:a {:b nested-arg}}] nested-arg)

但是当将键更改为vector时，它会引起错误。

(m/match x
  {:a {[:b :c]  1}}
  :found
  )

那不是[：b：c]是clojure地图中的有效键吗？否则它只是在clojure.core.match中无法使用？

原文

in clojure.core.match , this example works well in nested map

(match [{:a {:b :c}}]
  [{:a {:b nested-arg}}] nested-arg)

but when change the key to a vector it will raise error.

(m/match x
  {:a {[:b :c]  1}}
  :found
  )

Isn't that [:b :c] is a valid key in clojure map ? Or it just won't work in clojure.core.match ?

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自演自醉 2025-02-02 20:04:38

[：b：c]当然是有效的键。这是一个错误，已经报告了，请参见打开问题。

看来您也不能将映射与数字匹配为键：

(match/match [{:a 4}]
             [{:a _}] :found)
         
=> :found

(match/match [{2 4}]
             [{2 _}] :found)
         
Unexpected error (ClassCastException) macroexpanding match/match at ....
class java.lang.Long cannot be cast to class clojure.lang.Named (java.lang.Long is in module java.base of loader 'bootstrap'; clojure.lang.Named is in unnamed module of loader 'app')

[:b :c] is of course a valid key. This is a bug and it was already reported, see opened issue.

And it seems you can't also match map with numbers as keys:

(match/match [{:a 4}]
             [{:a _}] :found)
         
=> :found

(match/match [{2 4}]
             [{2 _}] :found)
         
Unexpected error (ClassCastException) macroexpanding match/match at ....
class java.lang.Long cannot be cast to class clojure.lang.Named (java.lang.Long is in module java.base of loader 'bootstrap'; clojure.lang.Named is in unnamed module of loader 'app')

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