Could type function (type X) print nothing?

[임정택]

Hello, Clojure users.

I'm a beginner of Clojure, so it could be a dumb question.

I'm playing with Apache Storm, and I leave below line to see tuple value when something is wrong.

(log-warn "Can't transfer tuple - task value is null. tuple type: " (type tuple) " and information: " tuple)

log-warn is defined...

(ns backtype.storm.log
  (:require [clojure.tools [logging :as log]]))

(defmacro log-warn
  [& args]
  `(log/warn (str ~@args)))

But it prints like...

2015-04-23T14:46:59.517+0200 b.s.d.worker [WARN] Can't transfer tuple - task value is null. tuple type:  and information: 

Evaluated value of (type tuple) and tuple value (maybe toString()?) doesn't printed. 
Is this possible? If possible, please let me know what type the tuple can be.

Thanks!

Regards.
Jungtaek Lim (HeartSaVioR)

[James Reeves]

    (str nil)

    => ""

    (type nil)

    => nil

    (str (type nil))

    => ""

Rather than use `str`, try using `pr-str` to get a more accurate representation of the data:

    (pr-str nil)

    => "nil"

- James

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[임정택]

My god, you save me. Thanks!

2015년 4월 25일 토요일 오후 12시 48분 25초 UTC+9, James Reeves 님의 말: