Ruby 3.0 Redux (Pivorak 4.0)

Transcript

1. None

2. Привiт!

3. Божидар

4. Божо cool

5. Bozhidar

6. Bozhidar

7. Божи дар

8. Божий дар

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10. Sofia, Bulgaria Sofia, Bulgaria

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12. bbatsov

13. Ruby & Rails style guides

14. •rubystyle.guide •rails.rubystyle.guide •rspec.rubystyle.guide •minitest.rubystyle.guide •blog.rubystyle.guide

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18. rubocop-minitest

19. rubocop-rake

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21. emacsredux.com

22. metaredux.com

23. #7 on the list of top white hackers in Bulgaria!

24. None

25. Божидар Батсов

26. стацковарфлоу

27. Expert in cyber security

28. Expert in the following programming languages: Unix, Emacs, Perl and

    Ruby

29. The Don Juan of IT in Bulgaria

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31. slide intentionally left blank

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34. Bulgarian Cheese

35. Болгарка

36. Слънчев Бряг

37. Златни пясъци

38. Банско

39. Луканка

40. Rakia Connecting People

41. Shopska Salad (use only with Rakia)

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44. Bulgarian politics are shit wrapped in cellophane.

45. I’m never happy about a small pig and a new

    boss.

46. To mess with my deputy is like sitting butt naked

    on a hedgehog.
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55. The most beautiful city in Ukraine

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57. То є Львів, мій колєґа, про нього різне кажуть: Приезжим

    из востока Криївку тут покажуть. То є Львів, моє місто, не з простого тіста, Ліплений роками – друзями й ворогами. То є Львів старенький, мудрий, сивий дядько, Кожному залишить кавалочок на згадку. То є Львів "Бонжорно!", Неаполь і Ліворно, По-галицьки говорять, наші в них погоду роблять.

58. То є Львів, шановні, вбирайте шлюбні сподні, Краватку, маринарку і

    "вйо!" по Стрийськім парку. То є Львів чудовий, вуйко ґонуровий, Я тішуся, шо з вами ходжу цими вулицями. То є Львів старенький, мудрий, сивий дядько, Кожному залишить кавалочок на згадку. То є Львів "Бонжорно!", Неаполь і Ліворно, По-галицьки говорять, наші в них погоду роблять. То є Львів, то Львів...
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62. Not on Ruby’s Core Team

63. Matz on Ruby

64. Language Maturity

65. The Ruby Community

66. Ruby is not dying

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69. We have to feed the community intellectually. — Matz

70. We have to keep moving forward. — Matz

71. Backwards Compatibility

72. We’re not going to repeat the Python 3 mistakes! —

    Matz

73. Victim of the Hype Cycle

74. None

75. Rails Mania (2008)

76. Ruby Today

77. Ruby Today

78. 2025

79. Matz’s Retirement

80. None

81. Ruby 4

82. Ruby 4x4

83. Ruby 4 is going to be 4 times faster than

    Ruby 3

84. Ruby 4 is going to be 12 times faster than

    Ruby 2

85. Ruby 4 is finally going to be fast enough!

86. None

87. What about Ruby 3?

88. –Matz “We’ll aim to release Ruby 3 for the Olympic

    Games in Tokyo in 2020.”

89. Ruby 3 Goals •Improved programming safety •Faster performance •Better concurrency/parallelism

    support •Better tools

90. Optional static typing?

91. Duck inference?

92. Actors?

93. Stream based model?

94. Ownership based model?

95. Guilds?

96. 3 times faster performance?

97. Smaller Goals •Sane keyword arguments (?!!?!) •Pattern Matching •Deprecation of

    quirky features •Frozen string literals
98. None

99. Ruby 3.0 Redux

100. Dictionary Definitions

101. Ruby

102. 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. 3

104. 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.

105. Redux

106. 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. None

108. Ruby 3.0 is not a single magic release

109. Ruby 3.0 is an idea

110. None

111. Ruby follows SemVer

112. Ruby 3 is going to be 3 times faster than

     Ruby 2.0

113. Generational GC (Ruby 2.1)

114. Incremental GC (Ruby 2.2)

115. MJIT (Ruby 2.6)

116. New AST library (Ruby 2.6)

117. Deprecation of flip-flops (Ruby 2.6)

118. Ruby 2.7

119. Numbered block parameters

120. numbers.map { Math.log2(@1) }

121. foo.bar { @1 + @2 }

122. h = Hash.new { @1[@2] = "Go Fish: #{@2}" }

123. h = Hash.new { @1[@2] = "Go Fish: #{@2}" }

124. None

125. https://bugs.ruby-lang.org/issues/15723

126. numbers.map { Math.log2(_1) }

127. None

128. Method reference operator

129. [2, 4, 8, 16, 32].map { |n| Math.log2(n) }

130. [2, 4, 8, 16, 32].map(&method(Math.log2))

131. [2, 4, 8, 16, 32].map(&Math.:log2)

132. [2, 4, 8, 16, 32].map { Math.log2(_1) }

133. Beginless range

134. Beginless range

135. Beginningless range

136. arr[..3]

137. items.where(price: ..20)

138. None

139. Pattern Matching (https://bugs.ruby-lang.org/issues/14912)

140. 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

141. case JSON.parse('{...}', symbolize_names: true) in {name: "Alice", children: [{name: "Bob",

     age: age}]} p age ... end
142. None

143. 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

144. All those features are experimental and subject to change

145. Deprecating $; and $,

146. > $; = " " warning: non-nil $; will be

     deprecate => " " > "hello world!".split warning: $; is set to non-nil value => ["hello", "world!"] > $, = " " warning: non-nil $, will be deprecated => " " > ["hello", "world!"].join warning: non-nil $, will be deprecated => "hello world!"

147. Compaction GC

148. MJIT Tuning/optimizations

149. flip-flops were finally deprecated!

150. Then they were reinstated…

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152. Pipeline operator

153. foo() .bar(1, 2) .display

154. foo() |> bar 1, 2 |> display

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156. Added, contested and removed

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158. Ruby 2.7 is coming for Christmas!

159. Ruby 3.0 (Current Status)

160. Better Tools

161. RubyGems 3

162. The bundling of Bundler (Ruby 2.6)

163. Gemifying the Standard Library (ongoing progress)

164. Default vs Bundled Gems

165. Default Gems • Bundler • RubyGems • date • irb

     • json • …

166. Bundled Gems • minitest • did_you_mean • rake • …

167. stdgems.org

168. irb • New reline backend (portable replacement for readline) •

     Completion • Multi-line editing • Syntax-highlighting • Integration with RDoc
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170. RDoc • Redesigned documentation system • Twice as fast

171. Ruby 3x3

172. Only applies to certain benchmarks

173. Ruby 2.6 is 65% faster than Ruby 2.0

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175. 10% average speedup per release

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177. MJIT is the biggest hope for Ruby 3x3

178. Guilds

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181. Developed outside the Ruby’s main repo

182. https://github.com/ko1/ruby/tree/guild

183. Work in progress ™

184. Parallel Programming in Ruby 3 with Guilds (http://www.atdot.net/~ko1/activities/2018_rubyconf2018.pdf)

185. Static Typing

186. https://bugs.ruby-lang.org/issues/9999

187. None

188. Native Support for Тype Signatures in Ruby 3.0

189. None

190. With a twist…

191. Dedicated Ruby interface files (.rbi)

192. Dedicated Ruby signature files (.rbs)

193. 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

194. https://github.com/soutaro/steep

195. Type Signatures for Ruby Core (https://github.com/ruby/ruby-signature)

196. Rakia Connecting People

197. Open Questions • Is Steep becoming part of the Standard

     Library? • How is Sorbet going to make use of its type annotations? • Typing applications

198. Built-in Type Inference Checker

199. def foo(x) if x > 10 x.to_s else x.boo() x

     + 42 end end foo(42)

200. $ 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

201. Resources • https://www.slideshare.net/mametter/a-typelevel-ruby- interpreter-for-testing-and-understanding • https://github.com/mame/ruby-type-profiler

202. Sane Keyword Arguments

203. https://bugs.ruby-lang.org/issues/14183

204. # The following calls pass keyword arguments foo(..., key: val)

     foo(..., **hsh) foo(..., key: val, **hsh)

205. # The following calls pass **normal** arguments foo(..., {key: val})

     foo(..., hsh) foo(..., {key: val, **hsh})

206. Breaking change!!!

207. Migration warning in Ruby 2.7

208. def a_method(k: 1) puts "k: #{k}" end a_method({k: 1}) (irb):4:

     warning: The last argument is used as the keyword parameter (irb):1: warning: for `a_method' defined here => k: 1

209. # To avoid the warning # and make it Ruby

     3 compatible, # use the double splat operator a_method(**{k: 1}) => k: 1

210. What’s not in Ruby 3.0?

211. Actors

212. Stream processing

213. Frozen string literals

214. Deprecation of autoload

215. https://github.com/fxn/zeitwerk

216. Deprecation of backticks (`some-command`)

217. Deprecation of character literals (?x)

218. Summary

219. • 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

220. Community Impact

221. Community Contributed Features • UTF-8 • Enumerator • Generational GC

     • Keyword Arguments • JIT • Concurrency

222. Community Contributions • Rake • Bundler • Documentation & Tutorials

     • A ton of amazing libraries • Rails • …
223. None

224. Real Namespaces (https://bugs.ruby-lang.org/issues/14982)

225. None

226. Felina

227. Дякую! twitter: @bbatsov github: @bbatsov https://metaredux.com https://emacsredux.com Pivorak 4.0 Lviv,

     Ukraine 18.10.2019