调试在Clojure？ [英] Debugging in Clojure?

问题描述

在使用repl时，Debug Clojure代码的最佳方法是什么？

What are best ways to Debug Clojure code, while using the repl?

推荐答案

还有dotrace，请查看所选函数的输入和输出。

There's also dotrace, which allows you to look at the inputs and outputs of selected functions.

(use 'clojure.contrib.trace)
(defn fib[n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
(dotrace [fib] (fib 3))

产生输出：

TRACE t4425: (fib 3)
TRACE t4426: |    (fib 2)
TRACE t4427: |    |    (fib 1)
TRACE t4427: |    |    => 1
TRACE t4428: |    |    (fib 0)
TRACE t4428: |    |    => 0
TRACE t4426: |    => 1
TRACE t4429: |    (fib 1)
TRACE t4429: |    => 1
TRACE t4425: => 2
2

---

在Clojure 1.4中， dotrace 已移动：

您需要依赖项：

[org.clojure/tools.trace "0.7.9"]
(require 'clojure.tools.trace)

您需要在函数定义中添加^：dynamic。

And you need to add the ^:dynamic to the function definition

(defn ^:dynamic fib[n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))

然后Bob再次是你的叔叔：

Then Bob is once again your uncle:

(clojure.tools.trace/dotrace [fib] (fib 3))

TRACE t4328: (fib 3)
TRACE t4329: | (fib 2)
TRACE t4330: | | (fib 1)
TRACE t4330: | | => 1
TRACE t4331: | | (fib 0)
TRACE t4331: | | => 0
TRACE t4329: | => 1
TRACE t4332: | (fib 1)
TRACE t4332: | => 1
TRACE t4328: => 2

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