问题
In clojure 1.2RC1, I wish to obtain a function based on its name as string and evaluate it.
Function definition
(ns my-ns)
(defn mycar [x] (first x))
The following worked:
((ns-resolve *ns* (symbol "mycar")) '(3 4))
((intern *ns* (symbol "mycar")) '(3 4))
((eval (symbol "mycar")) '(3 4))
but they seem ugly. Is there a better way? If not, which of the above is the most idiomatic?
回答1:
This worked for me without using eval:
user> (defn mycar [x] (first x))
#'user/mycar
user> ((resolve (symbol "mycar")) [1 2 3])
1
This works because resolves finds the mycar var in the current namespace and the var calls the function it's bound to. This is a shorter version of your first example. I'd use it just so that I could avoid using eval.
来源：https://stackoverflow.com/questions/3407921/clojure-resolving-function-from-string-name