• An overview of Ruby, explaining terminology and basic principles
• Operations on low-level data types (numbers, strings, regular expressions, dates)
• The new regular expression engine (Oniguruma)
• Internationalization (I18N) and message catalogs in Ruby
• Operations on hashes, arrays, and other data structures such as stacks, trees, and graphs
• Working with general I/O, files, and persistent objects
• Database coverage including MySQL, SQLite, Oracle, DBI, and more
• Ruby-specific techniques in OOP and dynamic programming
• Graphical interfaces in Ruby (Tk, GTK+, Fox, and Qt)
• Working with Ruby threads for lightweight multitasking
• Everyday scripting and system administration in Ruby
• Working with image files, PDFs, YAML, XML, RSS, and Atom
• Testing, debugging, profiling, and packaging Ruby code
• Low-level network programming and client-server interaction
• Web development tools including Rails, Nitro, Wee, IOWA, and more
• Working with distributed Ruby, Rinda, and Ring
• Ruby development tools such as IDEs, documentation tools, and more

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