Errata for Programming Ruby 1.9 (3rd edition)

#50607: In general the path:"samples" is wrong, dont exist in the zip file.

In this case: samples/book_in_stock.rb the correct path is: code/tut_classes/stock_stats .

You must correct the zip file changing 'code' for 'samples' or correct the wole book.--Matías Mascazzini

#50469: The hypothetical currency converter example, the ensure clause must be inside a begin... end.

begin
puts(exchange_rates.convert(line))
ensure
rate_mutex.unlock
end
--John Jackaman

#49921: test in book is:

context "specifying words and a dictionary" do
should "return the words" do
opts = Anagram::Options.new(["-d", "mydict", "word1", "word2"])
assert_equal ["word1", "word2"], opts.words_to_find
end
end

should it not read:

context "specifying words and a dictionary" do
should "return the words" do
opts = Anagram::Options.new(["-d", "mydict", "word1", "word2"])
assert_equal ["-d", "mydict", "word1", "word2"], opts.words_to_find
end
end--Andrew Gellene

#49640: I do not get the expected output ("Dave lives in Texas and likes Programming Languages") for the example in the page.

1.9.3p194 :005 > class Person < Struct.new(:name, :address, :likes)
1.9.3p194 :006?> def to_s
1.9.3p194 :007?> "#{self.name} lives in #{self.address} and likes #{self.likes}"
1.9.3p194 :008?> end
1.9.3p194 :009?> end
TypeError: superclass mismatch for class Person
from (irb):5
from /Users/katz/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
1.9.3p194 :010 > dave = Person.new('Dave', 'Texas')
=> #<struct Person name="Dave", address="Texas", likes=nil>
1.9.3p194 :011 > dave.likes
=> nil
1.9.3p194 :012 > p dave
#<struct Person name="Dave", address="Texas", likes=nil>
=> #<struct Person name="Dave", address="Texas", likes=nil>
1.9.3p194 :013 > p dave.to_s
"#<struct Person name=\"Dave\", address=\"Texas\", likes=nil>"
=> "#<struct Person name=\"Dave\", address=\"Texas\", likes=nil>"
--Katherine G. Pe

#49757: The index entry for %{...} takes me to 298 but it should take me to the table on page 296.

I have a hard time using the book as a reference guide. If possible, please consider the experienced programmer needing to look up things quickly.--Perry Smith