Clojure printing #object instead of value?

Question

I'm trying to learn Clojure and I'm starting with some basics such as functions, concatenation, lexicon replacement, etc. The one I'm stuck on currently is replacement. I've created a function called test that accepts two parameters v and v2; it's purpose is to replace periods with whitespace using clojure.string/replace:

(defn replace-lexicon [value lexicon replacementValue]
(println str(clojure.string/replace value lexicon replacementValue)))
  
(replace-lexicon "this.is.a.test" "." " ")

The expected output is:

this is a test

However, the output has additional information with it:

#object[clojure.core$str 0x35aea049 clojure.core$str@35aea049] this is a test

I tried searching for answers on how to remove it, but I'm not finding anything conclusive. Drawing on my experience with other languages, I can't help but feel this is demonstrating that what's being printed isn't a string but rather an object. Unfortunately though, this is just an educated guess, and, I haven't been able to prove it.

What is #object..., and how do I remove it to correct my output?

Alan Thompson Alan Thompson · Accepted Answer · 2021-09-03T00:43:46

Close! The extra str is the problem. Here is a version written with unit tests from my favorite template project:

(ns tst.demo.core
  (:use tupelo.core tupelo.test)
  (:require
    [clojure.string :as str]
  ))

(defn replace-lexicon
  [value lexicon replacementValue]
  (str/replace value lexicon replacementValue))

(dotest
  (is= "this is a test" (replace-lexicon "this.is.a.test" "." " "))
  (is= "this is a test" (replace-lexicon "this#is#a#test" "#" " "))
  )

A hint is in the substring clojure.core$str in the error msg, which is the compiler's way of representing the function clojure.core/str.

Clojure printing #object instead of value?

1 Answers