We try to keep our books accurate, but sometimes mistakes creep in. This page lists the errors submitted by our astute readers. If you've found a new error, please submit it.

The latest version of the book is P3.0, released over 1 year ago. If you've bought a PDF of the book and would like to upgrade it to this version (for free), visit your home page.

Key: Typo Tech. Error Suggestion Not a problem Next edition

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

(To find out what version you have, look at the copyright page, a few pages in from the front of the book. If it says (say) 'Second Printing', then here it'll be P2.0. If there are interim PDF releases in that printing, they'll be 2.1, 2.2, and so on.)

PDF Paper Description Found in Fixed in
61 49
#49124: On page 61 of the PDF book (or 49 in the paper book), you state that you cannot define rand within a parameter that doesn't start at zero. Whi...more...
 P3.0
17-Apr-12
92
#49834: The second exercise under "11.8 A Few Things to Try" Second sentence: "We've ripped a 100 or so CDs..." You don't need that "a" right ther...more...
 P3.0
20-Sep-12
98
#51519: Book states "You might have noticed that when we used each, the objects in the hash didn’t come out in the same order we put them in. (I mean...more...
 P3.0
15-May-13
148

#50352: Unused variable "bottles = " in:

num_at_start.downto(2) do |num|
bottles =
...
end--Leomar

 P3.0
10-Dec-12
148

#50353: "that" should be "than" in:

"It’s a bit more complex that the other examples here, partly because it’s a real, working tool."--Leomar

 P3.0
10-Dec-12
2001 zRotq
#48810: I know to go door to door, in bsuniesses like dentist offices, medical offices, etc.But what are some other good ways to get business going? T...more...
 P3.0
26-Feb-12