![Little Changes
Literal
Symbol lists
sym_list = %i{eeny meeny miny moe}
# => [:eeny, :meeny, :miny, :moe]](https://image.slidesharecdn.com/whatsnewinruby2-0-130307051324-phpapp02/85/What-s-new-in-Ruby-2-0-28-320.jpg)
What's new in Ruby 2.0
- 1. Ruby 2.0 What’s new?
- 2. r ions @ gee_for Interne t Solut About me by I <3 Ru #rub yOnBeer
- 3. History Install Deep Changes Big Little Changes Changes Eco System
- 4. History
- 5. Ruby’s History 0.95 Rails arrives on the scene. Arguably the First public release start of Ruby’s rise. Feb 24 Dec 25 Aug 1993 1996 1.2 1999 1.6 Aug 2003 Dec 2007 Dec 21 Dec Sep Dec 13 1995 1998 1.4 2000 2005 I want a language more powerful than Perl and Start of Xmas Tradi.on Language starts gaining Language hits the big more OO than Python serious trac.on .me. 1.0 1.8 1.9
- 6. Ruby’s History Rails arrives on the scene. Arguably the start of Ruby’s rise. Aug Dec 2003 2007 Dec 13 2.0 2005 nguage starts gaining Feb 24 Start of Xmas Tradi.on the big Language hits rious trac.on .me. 2013 1.8 1.9
- 7. Install
- 8. The one tru e way t rue way The one RVM RBENV ✦Update RVM ✦Update rbenv ✦rvm install ruby-2.0.0 ✦rbenv install 2.0.0-p0
- 9. Deep Changes
- 10. X X X BItmap Garbage Collection X X X
- 12. 1.9 GC Heap based M&S Ruby structures are divided in 2 halves, data and flags. Each structure has its own flag. Mark phase trawls through heap and updates FL_MARK flag in every object RString diagram from: http://patshaughnessy.net/2012/3/23/why-you-should-be-excited-about-garbage-collection-in-ruby-2-0
- 13. 2.0 GC Bitmap marking All mark flags for heap move to single dedicated data structure. 1 for In Use, 0 for Collectable. Flag not wriMen to data structure, much more friendly to copy-‐on-‐write Heap diagram from: http://patshaughnessy.net/2012/3/23/why-you-should-be-excited-about-garbage-collection-in-ruby-2-0
- 14. X X X Backward Compatible With 1.9 X X X
- 15. X X X require() speed improvements X X X
- 16. Big Changes
- 17. X X X Keyword Arguments X X X
- 18. Big Changes Keyword Arguments def foo(foo: ‘bar’, baz: ‘qux’, **rest) # Do something end foo(baz: ‘noqux’, foo: ‘frob’)
- 19. X X X Module Prepend X X X
- 20. Big Changes Module Prepend module IncludableModule def something; end end class MyClass prepend IncludableModule end
- 21. X X X Lazy Enumerators X X X
- 22. Big Changes Lazy Enumerators to_infinity = (0..Float::Infinity) beyond = to_infinity.lazy.select do |n| num % 42 == 0 end 100.times do { |n| puts beyond.next }
- 23. X X X Tracepoint X X X
- 24. Big Changes Trace Point OO alterna*ve to set_trace_func trace = TracePoint.new(:raise) do |t| puts "Alert: Exception raised!" end trace.enable
- 25. X X X Refinements X X X
- 26. Big Changes Refinements * Localised and contained monkey patching Module MyString refine String do def palindrome? self == self.reverse end end end using MyString # Monkey patch now active for context
- 27. little Changes
- 28. Little Changes Literal Symbol lists sym_list = %i{eeny meeny miny moe} # => [:eeny, :meeny, :miny, :moe]
- 29. Little Changes Binary Search haystack = (1..99999999) haystack.bsearch do |needle| needle == 12345 end # => 12345
- 30. Little Changes UTF-8 On by Default #!/usr/bin/env ruby1.9 #encoding: utf-8 puts “✖ ✹ ✚ ✭” #!/usr/bin/env ruby-2.0 puts “✖ ✹ ✚ ✭”
- 31. Little Changes __Dir__ keyword Similar in func*onality to __FILE__ Shows absolute path to file’s directory No more clunky File.dirname(__FILE__)
- 32. Little Changes .to_h Follows conven*on started by .to_s, to_i, to_a, etc Super useful for conver*ng Structs
- 33. Little Changes Grab Bag CGI is now HTML5 compa*ble net/hLp supports Server Name Indica*on (SNI) Zlib runs outside of the Global Interpreter Lock Unused variables can be prepended with _ to avoid warnings
- 34. Ecosystem
- 35. Ecosystem RubyGems 2.0 Start of support for stdlib gems No more out of place requires! MOAR BUNDLAR! Searching is remote by default Metadata through Gem::Specifica*on#metadata Simplified --document/--no-document No more --no-rdoc --no-ri mantra
- 36. Ecosystem Bundler 1.3(.1) Supports Ruby 2.0 Supports Rubygems 2.0 Supports Rails 4.0 install and update up to 150x faster Support for signed gems!
- 37. EcoSystem Rails 4.0 beta Ruby 2.0 is the official preferred ruby version Beta released 1 day a_er Ruby 2.0 gem install rails --version 4.0.0.beta1 --no-document gem ‘rails’, ‘4.0.0-beta1’
- 38. Now what
- 39. Thanks Any Questions? @gee_forr GEE.FORR@GMAIL.COM