Clojure中的数字参数的验证

问题描述

我有一个Clojure的功能：

I have a clojure function:

(defn f [arg1 arg2]
  ...)

我想测试，如果 ARG1 和 ARG2 的数字（仅适用于数字类型应该传递 - 不是数字格式化字符串）。有，当然，方法可以做到这一大堆，但我想这样做的惯用越好。建议？

I would like to test if arg1 and arg2 are numeric (only numeric types should pass - not numerically formatted strings). There are, of course, a whole bunch of ways to do this, but I'd like to do it as idiomatically as possible. Suggestions?

编辑：我知道关于：pre 。对是否就是处理这将是AP preciated适当/必要途径发表任何评论。

I know about :pre. Any comment on whether or not that is an appropriate/necessary way to handle this would be appreciated.

推荐答案

pre-条件下能做到这一点：

Pre-conditions can do that:

(defn test [arg1 arg2]
  {:pre [(number? arg1) (number? arg2)]}
  (+ arg1 arg2))

(test 1 2)
=> 3

(test 1 "2")
=> Assert failed: (number? arg2)

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