和Clojure一起玩,我注意到('+ 2 2)并没有像我预期的那样抛出错误 - 它返回2.我花了几分钟玩:
(def f (cast clojure.lang.IFn 'a-symbol))
(f 5) ;; => nil
(f 5 5) ;; => 5
(f 5 5 5) ;; ArityException Wrong number of args (3) passed to: Symbol
(f "hey") ;; => nil
(f "foo" "bar") ;; => "bar"
(f "foo" "bar" "baz") ;; => ArityException Wrong number of args (3) passed to: Symbol
据我所知,符号被转换为名称为Symbol的某个函数,它接受两个参数并返回第二个参数.我猜它与符号类的实现有关？
clojure ×1