Ruby 3.0: Redux (Saint P RubyConf 2019)

Transcript

3. Привет, ребята!
4. Божидар
5. Божо cool
6. Bozhidar
7. Bozhidar
8. Bug cool
9. Божи дар
10. Божий дар
12. @bbatsov
13. Бацов
14. Батсов
15. Sofia, Bulgaria Sofia, Bulgaria
18. Bulgarian Cheese
19. Болгарка
20. Слънчев Бряг
21. Златни пясъци
22. Банско
23. Луканка
24. Rakia Connecting People
25. Shopska Salad (use only with Rakia)
32. bbatsov
33. metaredux.com
51. Много городов у нас в России, Нету пальцев столько на ногах, С каждым годом всё они красивей, Утопают в солнце и в снегах.
56. Not on Ruby’s Core Team
57. Ruby & Rails style guides
62. Matz on Ruby
63. Language Maturity
64. The Ruby Community
65. Ruby is not dying
68. We have to feed the community intellectually. — Matz
69. We have to keep moving forward. — Matz
70. Backwards Compatibility
71. We’re not going to repeat the Python 3 mistakes! — Matz
72. Victim of the Hype Cycle
74. Rails Mania (2008)
75. Ruby Today
76. Ruby Today
78. Matz’s Retirement
80. Ruby 4
81. Ruby 4x4
82. Ruby 4 is going to be 4 times faster than Ruby 3
83. Ruby 4 is going to be 12 times faster than Ruby 2
84. Ruby 4 is finally going to be fast enough!
86. What about Ruby 3?
87. –Matz “We’ll aim to release Ruby 3 for the Olympic Games in Tokyo in 2020.”
88. Ruby 3 Goals •Improved programming safety •Faster performance •Better concurrency/parallelism support •Better tools
89. Optional static typing?
90. Duck inference?
91. Actors?
92. Stream based model?
93. Ownership based model?
94. Guilds?
95. 3 times faster performance?
96. Smaller Goals •Sane keyword arguments (?!!?!) •Pattern Matching •Deprecation of quirky features •Frozen string literals
98. Ruby 3.0 Redux
99. Dictionary Definitions
100. Ruby
101. noun 1. a precious stone consisting of corundum in colour varieties varying from deep crimson or purple to pale rose. 2. a programming language optimised for programmer happiness
103. number 1. equivalent to the sum of one and two; one more than two; 3 2. A mystical version rarely achieved by most software projects.
104. Redux
105. adjective 1. brought back, revived Emacs era redux 2. (usually postpositive) (esp of an artistic work) presented in a new way Apocalypse Now Redux
107. Ruby 3.0 is not a single magic release
108. Ruby 3.0 is an idea
110. Ruby follows SemVer
111. Ruby 3 is going to be 3 times faster than Ruby 2.0
112. Generational GC (Ruby 2.1)
113. Incremental GC (Ruby 2.2)
114. MJIT (Ruby 2.6)
115. New AST library (Ruby 2.6)
116. Deprecation of flip-flops (Ruby 2.6)
117. Ruby 2.7
118. Numbered block parameters
119. numbers.map { Math.log2(@1) }
120. foo.bar { @1 + @2 }
121. h = Hash.new { @1[@2] = "Go Fish: #{@2}" }
122. h = Hash.new { @1[@2] = "Go Fish: #{@2}" }
124. https://bugs.ruby-lang.org/issues/15723
125. Method reference operator
126. [2, 4, 8, 16, 32].map { |n| Math.log2(n) }
127. [2, 4, 8, 16, 32].map(&method(Math.log2))
128. [2, 4, 8, 16, 32].map(&Math.:log2)
129. [2, 4, 8, 16, 32].map { Math.log2($1) }
130. Beginless range
131. Beginless range
132. Beginningless range
133. arr[..3]
134. items.where(price: ..20)
136. Pattern Matching (https://bugs.ruby-lang.org/issues/14912)
137. person = JSON.parse('{...}', symbolize_names: true) if person[:name] == ‘Alice’ children = person[:children] if children.length == 1 && children[0][:name] == ‘Bob’ p children[0][:age] end end
138. case JSON.parse('{...}', symbolize_names: true) in {name: "Alice", children: [{name: "Bob", age: age}]} p age ... end
140. Resources • https://speakerdeck.com/k_tsj/pattern-matching-new- feature-in-ruby-2-dot-7 • https://medium.com/@baweaver/ruby-2-7-pattern-matching- first-impressions-cdb93c6246e6 • https://medium.com/@baweaver/ruby-2-7-pattern-matching- destructuring-on-point-90f56aaf7b4e
141. All those features are experimental and subject to change
142. Compaction GC
143. MJIT Tuning/optimizations
144. Ruby 2.7.0-preview1 is out!
145. Ruby 3.0 (Current Status)
146. Better Tools
147. RubyGems 3
148. The bundling of Bundler (Ruby 2.6)
149. Gemifying the Standard Library (ongoing progress)
150. Default vs Bundled Gems
151. Default Gems • Bundler • RubyGems • date • irb • json • …
152. Bundled Gems • minitest • did_you_mean • rake • …
153. stdgems.org
154. irb • New reline backend (portable replacement for readline) • Completion • Multi-line editing • Syntax-highlighting • Integration with RDoc
156. RDoc • Redesigned documentation system • Twice as fast
157. Ruby 3x3
158. Only applies to certain benchmarks
159. Ruby 2.6 is 65% faster than Ruby 2.0
161. 10% average speedup per release
163. MJIT is the biggest hope for Ruby 3x3
164. Guilds
167. Developed outside the Ruby’s main repo
168. https://github.com/ko1/ruby/tree/guild
169. Work in progress ™
170. Parallel Programming in Ruby 3 with Guilds (http://www.atdot.net/~ko1/activities/2018_rubyconf2018.pdf)
171. Static Typing
172. https://bugs.ruby-lang.org/issues/9999
174. Native Support for Тype Signatures in Ruby 3.0
176. With a twist…
177. Dedicated Ruby interface files (.rbi)
178. class Person @name: String @contacts: Array<Email | Phone> def initialize: (name: String) -> any def name: -> String def contacts: -> Array<Email | Phone> def guess_country: -> (String | nil) end
179. https://github.com/soutaro/steep
180. Type Signatures for Ruby Core (https://github.com/ruby/ruby-signature)
181. Rakia Connecting People
182. Open Questions • Is Steep becoming part of the Standard Library? • How is Sorbet going to make use of its type annotations? • Typing applications
183. Built-in Type Inference Checker
184. def foo(x) if x > 10 x.to_s else x.boo() x + 42 end end foo(42)
185. $ exe/type-profiler test.rb test.rb:6: [error] undefined method: Integer#boo test.rb:7: [error] failed to resolve overload: Integer#+ Object#foo :: (Integer) -> String
186. Resources • https://www.slideshare.net/mametter/a-typelevel-ruby- interpreter-for-testing-and-understanding • https://github.com/mame/ruby-type-profiler
187. Sane Keyword Arguments
188. https://bugs.ruby-lang.org/issues/14183
189. # The following calls pass keyword arguments foo(..., key: val) foo(..., **hsh) foo(..., key: val, **hsh)
190. # The following calls pass **normal** arguments foo(..., {key: val}) foo(..., hsh) foo(..., {key: val, **hsh})
191. Breaking change!!!
192. Migration warning in Ruby 2.7
193. What’s not in Ruby 3.0?
194. Actors
195. Stream processing
196. Frozen string literals
197. Deprecation of autoload
198. https://github.com/fxn/zeitwerk
199. Deprecation of backticks (`some-command`)
200. Deprecation of character literals (?x)
201. Summary
202. • Ruby 2.7 will be the final release in the 2.x series • Ruby 3.0 is scheduled to land in 2020 • Ruby 2.7 will serve as a preview for many of the key features in Ruby 3.0 • Static typing and Guilds are the biggest changes coming to Ruby 3.0 • Keyword argument overhaul is going to be a breaking change • The migration path from Ruby 2.x to 3.x should be very smooth
203. Community Impact
204. Community Contributed Features • UTF-8 • Enumerator • Generational GC • Keyword Arguments • JIT • Concurrency
205. Community Contributions • Rake • Bundler • Documentation & Tutorials • A ton of amazing libraries • Rails • …
207. Real Namespaces (https://bugs.ruby-lang.org/issues/14982)
209. Felina
210. Спасибо! twitter: @bbatsov github: @bbatsov https://metaredux.com https://emacsredux.com Saint P RubyConf 2019 Saint Petersburg, Russia 01.06.2019