Ievgenii Narovlianskyi - Ruby is not just a gem
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The document provides an overview of Ruby, a programming language created by Yukihiro Matsumoto in 1993, highlighting its history, community, and development challenges. It covers major milestones from Ruby's release in 1996 to recent versions, and emphasizes Ruby's user-friendly nature and adherence to the KISS principle. Additionally, it includes code examples that demonstrate Ruby's syntax and object-oriented features.
![array = [1, "a", [2, :b]]
array.first
=> 1
array.select {|e| [String, Array].include?(e) }
=> ["a", [2, :b]]
array.map &:to_s
=> ["1", "a", "[2, :b]"]
2. Play with Arrays](https://image.slidesharecdn.com/rubyisnotjustagem-160429140350/85/Ievgenii-Narovlianskyi-Ruby-is-not-just-a-gem-13-320.jpg)
![hash = {field: "2", key: [3, "4"]}
hash[:key]
=> "2"
hash.keys
=> [:field, :key]
hash.flatten
=> [:field, "2", :key, [3, "4"]]
other_hash = {field: 3, other_key: "c"}
hash.merge other_hash
=> {:field=>3, :key=>[3, "4"], :other_key=>"c"}
2. Play with Hashes](https://image.slidesharecdn.com/rubyisnotjustagem-160429140350/85/Ievgenii-Narovlianskyi-Ruby-is-not-just-a-gem-14-320.jpg)
Ievgenii Narovlianskyi - Ruby is not just a gem
- 1. RUBY IS NOT JUST A GEM Ruby is also an awesome programming language. It is a good choice for those who like and follow the KISS principle.
- 2. IN THIS PRESENTATION: ➤ Short language history ➤ Ruby’s flow ➤ Some code examples ➤ Ruby’s community ➤ Few words about nowadays problems of complex systems development & how Ruby ships us in solving them ➤ Your questions and my answers
- 3. MEET THE LIFE STORY (SHORT RUBY’S HISTORY NOTES) 21 years old
- 4. BIRTH 1993 Matz (Yukihiro Matsumoto) wanted a language perfect for his needs: ➤ Syntactically Simple ➤ Truly Object-Oriented ➤ Having Iterators and Closures ➤ Exception Handling ➤ Garbage Collection ➤ Portable
- 5. TODDLER YEARS December, 1996 ➤ Ruby 1.0 was released ➤ Ruby 1.1 shortly followed in August of 1997 ➤ The first stable version of Ruby (1.2) was released in December of 1998.
- 6. PRIMARY SCHOOL YEARS 1998-2004 ➤ In 1998, Matz created a simple English homepage for Ruby - ‘Ruby- Talk’. Ruby was beginning to spread beyond Japan. ➤ In October of 1999: the first book on the Ruby programming language «The Object-oriented Scripting Language Ruby» by Yukihiro Matsumoto and Keiju Ishitsuka. ➤ In 2001, the first English book on Ruby, Programming Ruby (“The Pickaxe”), was published. ➤ Ruby 1.8 was released in 2003. This release made large amounts of changes to the agile 10-year-old language. ➤ In 2004, RubyGems was released to the public.
- 7. THE REBELLIOUS TEENAGER 2005-2012 ➤ 2005: Ruby on Rails (RoR) ➤ In March of 2007, Ruby 1.8.6 was released ➤ December, 2007: Ruby 1.9 ➤ 2011: Ruby 1.9.3 (stable)
- 8. STRONG ADULT 2013-nowadays ➤ February 2013: Ruby 2.0.0 was released ➤ Christmas day of 2013: Ruby 2.1.0 was released ➤ Ruby’s 21st birthday (February 24, 2014): Ruby 2.1.1 was released. Ruby is now legally allowed to drink in the US. (Speed improvements and bugfixes). ➤ May of 2014: Ruby 2.1.2 was released (more bugfixes and is the current stable version of Ruby).
- 9. FUTURE Matz wanted a programming language that suited his needs, so he built one. (If you can’t find something that you like, program it yourself). From 0.95 to 2.1.2, Ruby has struck the awe of those who wished to program the way they wanted, not the way the machine wanted. We can’t know the future of the Ruby language, but we can predict it based on the past. I believe that the Ruby language, and its fantastic community will continue furthering the language above and beyond what others think is possible, and projects built using it will do the same.
- 10. RUBY’S FLOW Ruby code Ruby interpreter jRuby MRI
- 11. PEACES OF CODE puts ’’Hello, World!’’ 1. Hello world => Hello, World!
- 12. a = 10 puts ’’now ’a’ is equal to: #{a}’’ 2. String interpolation => now ’a’ is equal to 10
- 13. array = [1, "a", [2, :b]] array.first => 1 array.select {|e| [String, Array].include?(e) } => ["a", [2, :b]] array.map &:to_s => ["1", "a", "[2, :b]"] 2. Play with Arrays
- 14. hash = {field: "2", key: [3, "4"]} hash[:key] => "2" hash.keys => [:field, :key] hash.flatten => [:field, "2", :key, [3, "4"]] other_hash = {field: 3, other_key: "c"} hash.merge other_hash => {:field=>3, :key=>[3, "4"], :other_key=>"c"} 2. Play with Hashes
- 15. class Fruit attr_reader :weight, :eaten def initialize(weight) @weight = weight @eaten = false end def eat if @eaten raise "This #{class}" was already eaten" end @eaten = true end end 3. Some OOP class Apple < Fruit attr_reader :cultivar def initialize(weight, cultivar) super(weight) @cultivar = cultivar end def eat super @weight = @weight * 0.1 end end
- 16. test_apple = Apple.new(300, "Rannet") test_apple.weight => 300 test_apple.cultivar => «Rannet» test_apple.eaten => false test_apple.eat => true test_apple.weight => 30 test_apple.eat => RuntimeError: This Apple was already eaten
- 17. RUBY’S COMMUNITY ➤ Ruby groups: rubyusergroups.org ➤ Ruby mailing (Ruby-Talk, Ruby-Core, Ruby-Doc, Ruby-CVS) ➤ Ruby IRC (irc://irc.freenode.net/ruby) ➤ Blogs (O’Reilly Ruby, Riding Rails, Ruby Inside, Matz’ Blog) ➤ Contribute to Ruby Core (https://github.com/ruby/ruby) ➤ Conferentions (RubyConf, RubyKaigi, …)
- 18. NOWADAYS DEVELOPMENT PROBLEMS COMPLEXITY USERS COUNT TIME, DEV RESOURCES SUPPORT, COMPUTING RESOURCES, DATA STORAGE