Errata

"#{@name} the dog, age #{age}"

#{age} must be #{@age}

Note from the Author or Editor:
The code actually works as printed, because it calls the "age" attr_reader method inherited from the Animal class. But this is indeed a typo; I intended to access the @age instance variable just as I did with the @name instance variable.

The "print_pay_stub" methods never used "super". They just used the inherited "print_name" method.

Note from the Author or Editor:
On page 143, change this text:

In the previous chapter, we used super within our print_pay_stub methods in SalariedEmployee and HourlyEmployee to delegate printing of the employee name to the Employee superclass. Now we’ve just done the same thing with the initialize method, allowing the superclass to handle setting of the name attribute.

To this:

In the previous chapter, we used super within ordinary instance methods like the greet_by_name method of Friend or the move method of Armadillo to delegate part of the method functionality to the superclass. Now we’ve just done the same thing with the initialize method of our employee subclasses, allowing the superclass to handle setting of the name attribute.

Previously, we declared this array:

prices = [2.99, 25.00, 9.99]

Then, we want to print out the array contents using the 'puts' method, but the ebook shows wrong array contents:

puts prices[0] /=> 3.99
puts prices[2] /=> 25.0
puts prices[1] /=> 8.99

The correct text should be this:

puts prices[0] /=> 2.99
puts prices[2] /=> 25.0
puts prices[1] /=> 9.99

Note from the Author or Editor:
The displayed output is indeed incorrect, but the corrected output submitted by the reader is in the wrong order. The corrected text should be:

puts prices[0] /=> 2.99
puts prices[2] /=> 9.99
puts prices[1] /=> 25.0

Throughout the chapter, the text "Truncated is funny: it can't..." within the "reviews.txt" sample file should be listed as "Truncated is funny - it can't..." (with a space-dash-space instead of a colon). As it appears now, the final result ends up appearing as: "The critics agree, Truncated is:\n'Amazing'\n'Funny:'\n'Astounding'", with a colon following one of the adjectives.

Content originating from the "reviews.txt" file needs to be changed on the following pages:
194
201
202
203
212

Thanks to Caleb Engelken for submitting this!

"Our own version" of "File.open" should really close the file after the "yield". After all, the automatic closing was the whole reason we switched to using a block, and you made quite a big point out of that in the previous two pages (and again mentioned it in the chapter's ending "bullet points"). It's also only one extra line, so it's not like that would make the example too complicated. On the contrary, I find the *lack* of closing irritating.

Note from the Author or Editor:
On page 198, this code sample under "There Are No Dumb Questions":

def File.open(name, mode)
file = File.new(name, mode)
if block_given?
yield(file)
else
return file
end
end

Should be updated to:

def File.open(name, mode)
file = File.new(name, mode)
if block_given?
yield(file)
else
return file
end
file.close
end

On this and all subsequent code listings for Chapter 13, the Minitest::Test class is used. This works fine in Minitest 5.0 and later, but in Minitest 4.3.2 (which is included with Ruby 2.0), the class's name is Minitest::Unit::TestCase. References to Minitest::Test result in a NameError, as that class does not exist in Minitest 4.3.2.

The solution is to install a later version of Minitest, by running "gem install minitest" at a system command prompt.

sinatra myserver.rb -p 8080 would cause Sinatra to listen on port 8080
should be:
ruby myserver.rb -p 8080 would cause Sinatra to listen on port 8080

Note from the Author or Editor:
Command text should be modified as described by submitter.