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The latest version of the book is P1.0, released 9 months ago. If you've bought a PDF of the book and would like to update it to this version (for free), visit your home page.

By default this page displays the errata for the latest version of the book. If you have a previous version, select it here:

If you've found a new error, please submit it.

  • Typo
  • Tech. error
  • Suggestion
  • Maybe next edition
  • Not a problem
  • Reported in: P1.0 (14-Jun-18)
PDF page: 26
The docstring for function 'greeting' says it returns 'Hello, username.' including full stop, so the body should really be `(str "Hello, " username "....more...
  • Reported in: P1.0 (16-May-18)
PDF page: 47
The function: (defn index-filter [pred coll] (when pred (for [[idx elt] (indexed coll) :when (pred elt)] idx))) Could just be: (de...more...
  • Reported in: P1.0 (16-May-18)
PDF page: 54
The results of the following two functions need to be swapped. (first {:fname "Aaron" :lname "Bedra}) -> ([:lname "Bedra"]) The result should be -...more...
  • Reported in: P1.0 (07-Aug-18)
PDF page: 97
Paper page: 83

Link to “Understanding Clojure’s PersistentVector Implementation” by Karl Krukow doesn't work.--Radek Kysely

  • Reported in: P1.0 (09-Mar-18)
PDF page: 132

The function big is missing the argument: x

(defn big? [ ] (> x 100))--Jonathan

  • Reported in: B3.0 (01-Feb-18)
PDF page: 172
On your code starting below “Now let’s put it all together.” To keep your code consistent with your previous, hard-coded make-reader and make-write...more...
  • Reported in: B3.0 (01-Feb-18)
PDF page: 182
In the def of jaws, the building of a sequence of notes in the text using the construct (Note. pitch 2 duration) fails with the error: "Error refresh...more...
  • Reported in: B4.0 (11-Feb-18)
PDF page: 215
These observations may be due to the way I am testing examples as they appear in the text. Maybe more explanation is required to introduce the concept...more...
  • Reported in: B4.0 (11-Feb-18)
PDF page: 215
On my previous submission for this page, about changing :balance to ::balance, I realize that the error is probably when you created test-savings and ...more...
  • Reported in: P1.0 (16-Oct-18)
Paper page: 251
Top of page 251 defines: (defn game [word player] ....) On later pages though the function is invoked as [player word], first on page 254: (g...more...