是否可以将两个函数应用于 Clojure 中的列表？

Question

我想调用我编写的 function 并将元素添加到哈希映射中。 我想知道如何将这两个函数应用于同一个列表。

例如，我有以下 DFS 递归代码的代码

(defn dfs-recur [maze curr-loc goal-loc parent]
  (;;Want to add elements of the following list to the parent map 
   ;; and call dfs-recur on them
    (def unvisited (filter #(not (contains? parent %)) (get-neighbors maze curr-loc)))
    maze)

如果我要在 python 中实现它，它看起来像这样。 问题是，我不明白如何在 Clojure 中一次在 for 循环中做所有 4 件事

def dfs-recur(maze, curr-loc, goal-loc, parent):
    neighbors = get-neighbors(maze, curr-loc)
    for i in neighbors:
        if i in parent:
            break;
        parent[i] = curr-loc
        if i == goal-loc:
            break;
        parent = dfs-recur(maze, i, goal-loc, parent)
    return parent

Answer 1

就像是：

(assoc {} your-key (your-func your-list))

Answer 2

你在寻找类似的东西

(into {} (for [x your-list] [x (val-func x)])

=> (into {} (for [x [1 2 3]] [x (str x)]))
{1 "1", 2 "2", 3 "3"}

或者一个带有 function 的钥匙也可以：

=> (into {} (for [x [1 2 3]] [(str x) (* x x)]))
{"1" 1, "2" 4, "3" 9}

Answer 3

when您可以执行多个操作而无需返回时使用。

例如

(when condition
    (assoc {} key value)
    (recursive-func arg1 arg2)
)