keys

(keys map)

返回一个序列,序列里包含给定 map 的所有键(key)。

; 空 Map

user=> (keys {})
nil

; 非空 Map

user=> (keys {:python "Guido" :clojure "Rich" :ruby "Matz"})
(:python :ruby :clojure)

讨论

comments powered by Disqus

Previous topic

key

Next topic

letfn