clojure - 将字符串列表转换为 clojure 中的单个字符串

Question

例如，假设我有一个列表

'("The" " " "Brown" " " "Cow")

我想把它变成

"The Brown Cow" 

clojure 中是否有执行此操作的命令？

Answer 1

我宁愿使用 apply为了那个原因:

(apply str '("The" " " "Brown" " " "Cow"))

由于它只调用一次函数，因此对于大型集合来说效率更高:

(defn join-reduce [strings] (reduce str strings))
(defn join-apply [strings] (apply str strings))

user> (time (do (join-reduce (repeat 50000 "hello"))
                nil))
"Elapsed time: 4708.637673 msecs"
nil
user> (time (do (join-apply (repeat 50000 "hello"))
                nil))
"Elapsed time: 2.281443 msecs"
nil