clojure - 将函数应用于具有常量参数的集合元素

Question

可能重复：
用常数映射序列

我正在尝试执行以下操作（只是一个示例）：

(defn f [x param] ( 
  ; do something with "x" AND with "param"
  ))
(defn filtered-list [param] (map f ["a" "b" "c"]))
; called later as
(filtered-list 123)
; expected calls are: (f "a" 123), (f "b" 123) and (f "c" 123)

所以，我需要找到一种方法来传递param给f，被map. 在 Clojure 中可以吗？这个特征也可以称为“功能闭包”。

Answer 1

用于partial从 f 创建一个柯里化函数，并传递参数

(defn f [param x] ( 
  ; do something with "x" AND with "param"
  ))

(defn filtered-list [param] (map (partial f param) ["a" "b" "c"]))

Answer 2

使用partial怎么样？

(defn f [param x]  
    (str param \- x) ;; do something
)

(defn filtered-list 
    [param] 
    (map (partial f param) ["a" "b" "c"]))

但是，您必须更改 的参数的顺序f。