Errata

Maybe this book is perfect? Apparently not quite. We’ll continue to post errata as it arrives.

Chapter 1

  • Page 17: should be (joy.chess/lookup (joy.chess/initial-board) "a1")

Chapter 2

  • Page 40: should be “report-ns exists in the joy.ch2 namespace”

Chapter 3

  • Page 51, Section 3.4: should be “from one to the other”
  • Page 52: Regular expressions are covered in section 4.5, page 73

Chapter 4

  • Page 71, Section 4.4: should be “when evaluated in the (identical? x y) form”

Chapter 5

  • Page 85, Listing 5.1: The last line of the listing should be:
    • (map #(vec (map + yx %)) deltas))))

Chapter 7

  • Page 153: note the errata from page 85 above
  • Section 7.4: The A* h function uses a very high weighted value to estimate path cost. As a result, the examples presented provide estimations that are too pessimistic.

Chapter 8

  • Page 160: quoting was introduced in section 2.6, page 32
  • Page 163: quoting was introduced in section 2.6, page 32

Chapter 9

  • Page 192: should be (TreeNode. 5 nil nil) (not (TreeNodePlus 5 nil nil))

Chapter 10

  • Page 217: the word genclass should be removed from the "Eat Cheetos" example.

Resources

  • Page 317: should be “Norvig, Peter 1998.”

Thanks to everyone who submitted these corrections.

9 Responses

  2. Bernhard Groll says:
    2011,August.27 at 18:33

    Page 84, Table 5.1: The entry for “If the index is out of range” and “get” should be “Returns ‘not found’ or nil” instead of “Returns nil”.

  4. Stefan Hallerstede says:
    2011,December.1 at 11:40

    On page 41, bottom: should be “(:refer joy.ch2 On page 42, top: should be “(:refer joy.ch2 …

  5. Adrian Mouat says:
    2011,December.4 at 14:12

    On page 181, consider changing “…for Clojure namespaces and not part of…” to “…for Clojure namespaces and is not part of…”.

    On page 178, I find figure 9.1 a bit confusing. I wonder if it originally mirrored a listing that was changed? Should joy.nc/authors be joy.ns/authors? I would like more context for the ‘Date prefix as well.

    On page 150, the first sentence of the last para doesn’t seem to agree with the listing. It says: “From the y-x point [0 0] the cost of travelling 5 right and 5 down given an estimated cost step-cost-est is 9000.” Should it be “… step-cost-est of 900 is 7200″? Possibly I’ve just misunderstood what it’s trying to say though.

    Any, great book, best programming book I’ve read in a long time!

    Regards,

    Adrian.

  6. Topher says:
    2012,January.22 at 07:57

    The last code block of page 41 also incorrectly refers to the namespace “joy.ch1″. The “:refer” call should be to “joy.ch2″.

    In the last code block on page 41, “(:refer joy.ch1)” should be “(:refer joy.ch2)”

    It’s output should be “The current namespace is joy.yet-another”, not “The current namespace is $”. This is consistent with the output found on page 39 (ie: “The current namespace is joy.ch2″).

    Also, the next code block (the first on page 42) refers to joy.ch1. “:refer joy.ch1″ should be “:refer joy.ch2″.

  7. Topher says:
    2012,January.23 at 05:31

    There is an extra closing paren in the code block in the middle of page 47. “guys-whole-name 1)))” should be “guys-whole-name 1))”

Leave a Reply

*