创建闭包 [英] Creating a closure

问题描述

我想创建一个闭包（函数生成器）来将数字提高到一个大小，而不使用特定的Clojure库来完成这个任务。现在，我可以使用循环.. recur。

 （defn exp1 
 [in- exp-multi] 
（loop [num in-num exp-multi in-exp-multi] 
（if（> exp-multi 1）
 ）（ -  exp-multi 1））
 num）））
  

部分提高力量，但仍然坚持的构造需要重复乘一个数自身一些次数。

编辑：

p>这个例子只是为了解决一个问题使用循环。

解决方案

我无法从你的问题中准确地知道你要的是什么，但也许这个？

 （defn powers-of [exponent] 
（iterate＃（*％exponent）1 ））
 
（defn nth-power-of [exponent] 
（partial nth（幂的指数）））
 
 5）2）;;返回25 
  

我认为 iterate 根据你的描述寻找;它创建了一个应用于种子的函数的延迟序列。

I want to create a closure (function generator) to raise a number to a power, without using a specific Clojure library to accomplish this task. Right now, I can do this with loop .. recur.

(defn exp1
 [in-num in-exp-multi]
 (loop [num in-num exp-multi in-exp-multi]
    (if (> exp-multi 1)
        (recur (* num in-num) (- exp-multi 1))
        num)))

I have tried using partial to raise the power, but am still stuck on the construct needed to repeat multiplying a number by itself some number of times. So, I am looking for an example of generating a function and applying it x number of times.

Edit:

The example was simply to solve a problem using loop .. recur. My desire is to solve this with a closure.

解决方案

I can't tell from your question precisely what you're asking for, but maybe this?

(defn powers-of [exponent]
  (iterate #(* % exponent) 1))

(defn nth-power-of [exponent]
  (partial nth (powers-of exponent)))

((nth-power-of 5) 2) ;; returns 25

I think iterate is what you're looking for based on your description; it creates a lazy seq of the function applied over and over to the seed.

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