动态代码与clojure [英] Dynamic code with clojure

问题描述

我想在clojure中创建一些动态代码。在下面的函数中，想法是动态生成（和）宏的条件。

I'm trying to create some dynamic code within clojure. In the function below, the idea is that the conditions for the (and) macro will be dynamically generated.

(defn matching-keys [rec match-feed keys]
  (> (count (clojure.set/select #(and (for [k keys]
                                        (= (% k) (rec k))))
                                (set match-feed)))
     0))

工作！那么当传递 [：tag：attrs] 的键时，这个代码会产生一个类似这样的东西：

So if it worked!! then this code would produce an (and) something like this when passed keys of [:tag :attrs]:

(and (= (% :tag) (rec :tag))
     (= (% :attrs) (rec :attrs)))

我一直在使用各种``和〜`尝试使它工作，并且现在处于混乱的状态。欢迎任何指导。

I've been messing around with various `` and~` operators to try to make it work, and am now in a state of confusion. Any guidance is welcome.

感谢，

Colin

推荐答案

您不需要动态生成的代码。将匿名函数更改为＃（每个？（fn [k]（=（％k）（rec k）））keys）

You don't need dynamically generated code for this. Changing the anonymous function to #(every? (fn [k] (= (% k) (rec k))) keys) should do what you want without generating code at runtime.

使用高阶函数的功能意味着你几乎不需要动态生成代码。

The ability to use higher-order functions means that you should hardly ever need to dynamically generate code.

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