PREFACE xxi
Exactly what version of Ruby did I use to write this b ook? Let’s ask Ruby.
% ruby -v
ruby 1.8.2 (2004-08-24) [powerpc-darwin7.5.0]
This illustrates an important p oint. Most of the code samples you see in this book
are actually executed ea ch time I format the book. When you see some output from a
program, that output was produced by running the code and inserting the results back
into the book.
Changes in the Book
Apart from the updates to support Ruby 1.8, you’ll fin d that the book has changed
somewhat from the original edition.
In the first h alf of the book, I’ve added six new chapters. Getting Started is a more
complete introduction to getting up-and-running with Ruby than we had in the first
book. The second new cha pter, Unit Testing, reflects a growing emphasis on using
testing among Rubyists. Three new chapters cover tools for the Ruby pro grammer: irb
for experimenting with Rub y, RDoc for documenting your cod e, and RubyGems for
packing cod e for distribution. Finally, a new chapter covers duck typing , that slightly
slippery philosophy of programming th at fits in so well with the ideas beh ind Ruby.
That’s not all that’s new. You’ll also find that the chapter on threads has been extend ed
significantly with a discussion on sy nchron ization and that the chapter on writing Ruby
extensions has been largely rewritten. The chapter on Web program ming now discusses
alternative templating systems and ha s a section o n SOAP. The language refer e nce
chapter has been significantly extended (particularly when dealing with the new rules
for blocks, procs, brea ks, and returns).
The next quarter of the book, which documents the built-in classes and modules, has
more than 250 significant changes. Many of them are new methods, some are depre-
cated old methods, and some are metho ds with significant new behavior. You’ll also
find a number of new mo dules an d classes documented.
Finally, the book inclu des a section on the standard library. The library has grown
extensively since Ruby 1.6 and is now so big that I couldn’t document it to a ny level
of detail without making the book tho usands of pages long. At the same time, the
Ruby Documentation project has been busy adding RDoc documentation to the librar y
source itself. (I explain RDoc in Chapter
16
on page
187
.) This means that you will
increasingly be able to get a c curate, up-to-date documentation on a library module
have odd subversion numbers, such as 1.7 and 1.9. These you’ll have to download and build for yourself, as
described on page
3.
Prepared exclusively for Yeganefar
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