Errata for Programming Clojure (2nd edition)

#49131: The ebook reader on my Android tablet shows an incorrect thumbnail, it shows "SQL Antipatterns", i.e. images/_covers/bksqla.jpg (the 1st within that directory) instead of images/cover.jpg . Rather, rather strange!--Jochen Hayek

#47991: URLs in footnotes (as on this page, but there are others) are missing the ':' after 'http'. The linked URL itself is correct, i.e. the hyperlink works, but the 'printed' URL lacks the semicolon.
--Justin Forder

#48010: In the epub version on the nook touch, Table 1, the underline of "Using Numeric Types" for the link is not under that part of the text, but spans the whole part of the line that is before that text.--Steven Proctor

#48848: Example on page 60 where you are explaining how maps can be treated as sequences too:

(first {:fname "Aaron" :lname "Bedra"})
-> [:lname "Bedra"] // Should Be: -> [:fname "Aaron"]
(rest {:fname "Aaron" :lname "Bedra"})
-> ([:fname "Aaron"]) // Should Be: -> [:lname "Bedra"]

Looks like the results got mixed up--Joshua Niehus

#48016: Page 78 on epub on nook touch. Table 2. is getting cut off. the table title stops after "functional", and the last column is "Variables". These may be the last things in the table, but the border is not showing so I am unable to tell if there are or not.--Steven Proctor

#48017: Page 109 in epub on nook touch. The section title for 3.5 is cut off from rendering, and does not wrap. It shows "3.5 Calling Structure-Specific Func-", the "tions" part is not displayed at all.--Steven Proctor

#50439: In my version of the text,`(alter ref update-fn & args...)` has the word `ref` typeset in bold purple, which makes it appear to be the Clojure `ref` function. But really you want `ref` to indicate an argument (e.g. a placeholder for the name of a ref). So, to fix, just remove the bold purple formatting.--David James

#50440: My version of `(commute ref update-fn & args...)` has `ref` in bold purple. This is confusing because it makes it appear that `ref` is a 'built-in' Clojure function. It is clearer to make the formatting be plain. If automatic syntax highlighting is to blame, then perhaps use `ref-symbol` or `the-ref` instead of `ref`. You may want to check for additional examples of this happening -- I've already found one other (on the previous page).--David James

#48027: The Sharp is not getting rendered after the C and the flat is not getting rendered after the D. Those are non-printable characters it would seem. In the PDF it is just showing a space, and when I look at it on the nook touch, it is showing a the non-printable unfilled rectangle. It is in the sentence: "The pitch will be represented by a keyword like :C, :C#, :Db, which represent the notes C, C (C sharp), and D (D flat), respectively."--Steven Proctor

#50790: (definterface IOFactory
(^java.io.BufferReader make-reader [this])
(^java.io.BufferedWriter make-writer [this]))

should be :

(definterface IOFactory
(^java.io.BufferReader make-reader [])
(^java.io.BufferedWriter make-writer []))

--Yuexiang Zhang

#49806: in
(definterface IOFactory
has an error in:
(^java.io.BufferReader make-reader [this])
......
correct in
(^java.io.BufferedReader make-reader [this])
.....--ugo vierucci

#48018: Page 150 in epub on nook touch. Chapter 5. The title of the chapter is cut off and not rendering the complete chapter name. It is rendering "Protocols and Data-".--Steven Proctor

#49066: very very minor suggestion - I think the line "Clojure’s spit and slurp I/O functions are built on two abstractions, reading and writing." at the top of the page should read "Clojure’s slurp and spit I/O functions are built on two abstractions, reading and writing." , as in their minds, people would tend to implicitly order the abstractions the same as the I/O functions mentioned. Overall, the section clarifies this, but it would read better if the ordering of the I/O functions was the same as the abstractions mentioned associated with them.--Umesh Telang

#49808: in
(ns examples.cryptovault_complete
(:require [clojure.java.io :as io]
[examples.protocols.io :as proto])
.......................
has is wrong: 'examples.protocols.io'

the correct form is:
(ns examples.cryptovault_complete
(:require [clojure.java.io :as io]
[examples.io :as proto])
.................--ugo vierucci

#48015: Page 161 of epub on nook touch. The cryptovault.clj code formatting is off with the line wraps weird. The "... define method body here ...)" is having wrapping or newline issues. It winds up displaying, with the '/n' for where the line breaks, "../n. define method body here ../n.)". It is doing that on the init-value, vault-output-stream, vault-input-stream method declarations.--Steven Proctor

#48891: The two method definitions in the code listings are missing the defn:

(vault-output-stream [vault] SHOULD READ (defn vault-output-stream [vault]

and

(vault-input-stream [vault] SHOULD READ (defn vault-input-stream [vault]--Ernesto Schirmacher

#49770: It's just the absence of the final closing parenthesis:

(extend-type Note
MidiNote
(to-msec [this tempo]
(let [duration-to-bpm {1 240, 1/2 120, 1/4 60, 1/8 30, 1/16 15}]
(* 1000 (/ (duration-to-bpm (:duration this))
tempo))))

should be:

(extend-type Note
MidiNote
(to-msec [this tempo]
(let [duration-to-bpm {1 240, 1/2 120, 1/4 60, 1/8 30, 1/16 15}]
(* 1000 (/ (duration-to-bpm (:duration this))
tempo)))))

--Iván González Aguilar

#49887: There is a typo in the function: (aset arr2 "fill")

(defn painstakingly-create-array []
(let [arr (make-array String 5)]
(aset arr 0 "Painstaking")
(aset arr 1 "to")
(aset arr2 "fill")
(aset arr 3" in")
(aset arr 4 "arrays")
arr))

It should be:

(defn painstakingly-create-array []
(let [arr (make-array String 5)]
(aset arr 0 "Painstaking")
(aset arr 1 "to")
(aset arr 2 "fill")
(aset arr 3" in")
(aset arr 4 "arrays")
arr))--Iván González Aguilar

#49912: The name of the function is wrong:

(scoring-is-bound-by-number-of-pegs secret guess (game/score secret guess))

This should be:

(scoring-is-bounded-by-number-of-pegs secret guess (game/score secret guess))

--Iván González Aguilar