反思Clojure函数名称

Question

How do I use reflection in Clojure to extract the function name of a symbol that evaluates to a function?

(require '[clojure.reflect :as r])
(defn foo [x] x)
(r/reflect foo)
=> {#clojure.reflect.Field ... 'gobbledygook}

Something about (map :name (:members (r/reflect foo))) ?

Answer 1

No, please do not use str because it behaves differently. In my example, here is what I've got:

user=> (defn foo [x] x)
#'user/foo
user=> (str foo)
"user$foo@7cb20059"

Instead, use combination of meta and var calls:

(-> foo var meta)

This code returns a map of variable's metadata. The key :name holds the function name as a string:

(-> foo var meta :name)
foo

If you also want to have an ns's name, do the following:

user=> (-> foo var meta :ns ns-name)
user

It gets the namespace object and returns its name with the ns-name function as a string.

Those methods do not depend on Clojure or REPL version and thus are more maintainable.

Answer 2

Looks like I can use str :

(str foo)
=> "#'my-project/foo"