RubyConf 2010 Keynote by Matz

Keynote Yukihiro "Matz" Matsumoto まつもとゆきひろ @yukihiro_matz Keynote Powered by Rabbit 0.9.1

Acknowledgment In memory of Guy Decoux _why the lucky stiﬀ Zed Shaw 1/88 Keynote Powered by Rabbit 0.9.1

Today's Menu History Future Diversity 2/88 Keynote Powered by Rabbit 0.9.1

History 10th Annual RubyConf 3/88 Keynote Powered by Rabbit 0.9.1

History 9 Keynotes by me 4/88 Keynote Powered by Rabbit 0.9.1

2001 Tampa, FL 5/88 Keynote Powered by Rabbit 0.9.1

2001 Human-Oriented Programming in Ruby 6/88 Keynote Powered by Rabbit 0.9.1

2002 Seattle, WA 7/88 Keynote Powered by Rabbit 0.9.1

2002 Be Minor, Be Cool 8/88 Keynote Powered by Rabbit 0.9.1

2003 Austin, TX 9/88 Keynote Powered by Rabbit 0.9.1

2003 Visions for the Future How Ruby Sucks 10/88 Keynote Powered by Rabbit 0.9.1

2004 Chantilly, VA 11/88 Keynote Powered by Rabbit 0.9.1

2004 12/88 Keynote Powered by Rabbit 0.9.1

2004 13/88 Keynote Powered by Rabbit 0.9.1

2005 San Diego, CA 14/88 Keynote Powered by Rabbit 0.9.1

2005 Visions for the Future Wild and Weird Ideas 15/88 Keynote Powered by Rabbit 0.9.1

2006 Denver, CO 16/88 Keynote Powered by Rabbit 0.9.1

2006 The Return of the Bikeshed or Nuclear Plant in the Backyard 17/88 Keynote Powered by Rabbit 0.9.1

2007 Charlotte, NC 18/88 Keynote Powered by Rabbit 0.9.1

2007 Language Matters 19/88 Keynote Powered by Rabbit 0.9.1

2008 Orlando, FL 20/88 Keynote Powered by Rabbit 0.9.1

2008 Reasons behind Ruby 21/88 Keynote Powered by Rabbit 0.9.1

2009 San Francisco, CA 22/88 Keynote Powered by Rabbit 0.9.1

2009 The 0.8 True Language (ZEPT) 23/88 Keynote Powered by Rabbit 0.9.1

2010 New Orleans, LA 24/88 Keynote Powered by Rabbit 0.9.1

2010 Future and Diversity 25/88 Keynote Powered by Rabbit 0.9.1

Future and Diversity 26/88 Keynote Powered by Rabbit 0.9.1

　The Future　 27/88 Keynote Powered by Rabbit 0.9.1

　Ruby 2.0　 28/88 Keynote Powered by Rabbit 0.9.1

Ruby 2.0 Traits Method Combination Keyword arguments Namespaces a few other nifty features 29/88 Keynote Powered by Rabbit 0.9.1

Traits trait a trait is a collection of methods, used as a "simple conceptual model for structuring object oriented programs". from Wikipedia (en) 30/88 Keynote Powered by Rabbit 0.9.1

What's wrong for Modules? Conflict detection Conflict resolution Tree modification No method combination 31/88 Keynote Powered by Rabbit 0.9.1

Conﬂict Detection name conﬂict intentional (overriding)? or accidental? 32/88 Keynote Powered by Rabbit 0.9.1

Conﬂict Problem module American attr_accessor :address end module Japanese attr_accessor :address end class JapaneseAmerican include American include Japanese end JapaneseAmerican.new.address # which address? p JapaneseAmerican.ancestors # => [JapaneseAmerican, Japanese, American, Object, Kernel] 33/88 Keynote Powered by Rabbit 0.9.1

Solution We will introduce #mix #mix will replace #include #mix can detect and resolve conﬂict 34/88 Keynote Powered by Rabbit 0.9.1

Module#mix injects the current snapshot into other class/module. raises error when name conﬂict unless you resolve it explicitly 35/88 Keynote Powered by Rabbit 0.9.1

Conﬂict Problem module American attr_accessor :address end module Japanese attr_accessor :address end class JapaneseAmerican # Japanese comes First include American include Japanese end 36/88 Keynote Powered by Rabbit 0.9.1

Detecting Conﬂict module American attr_accessor :address end module Japanese attr_accessor :address end class JapaneseAmerican mix American mix Japanese # => address conflict! end 37/88 Keynote Powered by Rabbit 0.9.1

Resolving Conﬂict class JapaneseAmerican mix American, :address => :us_address mix Japanese, :address => :jp_address end 38/88 Keynote Powered by Rabbit 0.9.1

Tree Modiﬁcation module M1; end class C1; include M1; end module M2; end module M1; include M2; end p C1.ancestors # [C1, M1, Object, Kernel] p M1.ancestors # [M1, M2] Keynote inconsistent 39/88 Powered by Rabbit 0.9.1

Tree Modification #mix copies attributes so tree modification afterward does not affect. consistent at leaset 40/88 Keynote Powered by Rabbit 0.9.1

alias_method_chain ugly fragile to multiple wrapping we want to wrap methods 41/88 Keynote Powered by Rabbit 0.9.1

Module#prepend We will introduce #prepend #prepend put the module before the current class/ module methods deﬁned in the class will wrap methods of same names 42/88 Keynote Powered by Rabbit 0.9.1

Module#prepend module Foo def foo p :before super p :after end end class Bar def foo p :foo end prepend Foo end Bar.new.foo # :before, :foo, :after 43/88 Keynote Powered by Rabbit 0.9.1

Keyword Arguments calling 1.step(by: 2, to: 20) do |i| p i end 44/88 Keynote Powered by Rabbit 0.9.1

Keyword Arguments deﬁning def step(by: step, to: limit) ... end 45/88 Keynote Powered by Rabbit 0.9.1

Keyword Arguments Mere expanded hash argument at the end Automatic decomposition 46/88 Keynote Powered by Rabbit 0.9.1

Namespaces encapsulation of monkey patching monkey patching is global modiﬁcation embodies freedom, but dangerous 47/88 Keynote Powered by Rabbit 0.9.1

Namespaces encapsulation of monkey patching classsbox / selector namespace / reﬁnement / whatever 48/88 Keynote Powered by Rabbit 0.9.1

What if class Integer def /(other) return quo(other) end end p 1/2 # => (1/2) 49/88 Keynote Powered by Rabbit 0.9.1

Allow Reﬁnement module MathN refine Integer do def /(other) return quo(other) end end p 1/2 # => (1/2) end p 1/2 # => 0 50/88 Keynote Powered by Rabbit 0.9.1

Using Reﬁnement module Rationalize using MathN p 1/2 # => (1/2) end p 1/2 # => 0 51/88 Keynote Powered by Rabbit 0.9.1

Real Private Methods class HasPrivate module Private def priv end end using Private def pub priv end end h = HasPrivate.new h.priv # => error h.instance_eval { priv # => error } 52/88 Keynote Powered by Rabbit 0.9.1

FAQ When will they be available? Ruby 2.0 53/88 Keynote Powered by Rabbit 0.9.1

FAQ When will Ruby2.0 be? Christmas on whatever year! 54/88 Keynote Powered by Rabbit 0.9.1

　Diversity　 55/88 Keynote Powered by Rabbit 0.9.1

　I love Diversity　 56/88 Keynote Powered by Rabbit 0.9.1

　I dislike Diversity　 57/88 Keynote Powered by Rabbit 0.9.1

The Ruby Language speciﬁcation implementation 58/88 Keynote Powered by Rabbit 0.9.1

The Ruby Language speciﬁcation ✓ Standard Ruby (ISO) ✓ RubySpec 59/88 Keynote Powered by Rabbit 0.9.1

The Ruby Language implementation ✓ CRuby ✓ JRuby ✓ Rubinius ✓ MagLev ✓ ... 60/88 Keynote Powered by Rabbit 0.9.1

Alternative to ﬁll the Niche JRuby for JVM MacRuby for Mac MagLev for GemStone Ruboto for Android 61/88 Keynote Powered by Rabbit 0.9.1

Yet another Niche Embedding 62/88 Keynote Powered by Rabbit 0.9.1

Rite The New Comer Light weight implmentation of usable subset of the Ruby language 63/88 Keynote Powered by Rabbit 0.9.1

Target Embedding Small devices Digital Appliances Applications (Game?) and more 64/88 Keynote Powered by Rabbit 0.9.1

Embeddable Ruby think of Lua with better language 65/88 Keynote Powered by Rabbit 0.9.1

Principle Components Conﬁgurable 66/88 Keynote Powered by Rabbit 0.9.1

Components the implementation will be combination of components parser virtual machine garbage collector debugger class libraries 67/88 Keynote Powered by Rabbit 0.9.1

Conﬁgurable to minimal set of features required for an application no universal behavior between platforms e.g. no ﬁle I/O for small devices 68/88 Keynote Powered by Rabbit 0.9.1

Configurable use double or float use int, long or long long for fixnums ASCII or UTF-8 69/88 Keynote Powered by Rabbit 0.9.1

Requirement portable minimal requirement: standard C (C99) should run on PC / RTOS / free standing less memory less latency 70/88 Keynote Powered by Rabbit 0.9.1

Implementaion Detail register-based virtual machine 32bit word-code ﬂoats are immediate (possibly generational) incremental mark-sweep GC 71/88 Keynote Powered by Rabbit 0.9.1

What can I do with Rite? embedding ✓ application embedding ✓ small devices e.g. digital TV 72/88 Keynote Powered by Rabbit 0.9.1

What can I do with Rite? concurrent ✓ assign virtual machine for each thread 73/88 Keynote Powered by Rabbit 0.9.1

the Ruby chip by Prof. Tanaka from Kyushu Institute of Technology MIPS-like FPGA CPU with a few instructions added that help method look-up and garbage collection marking 74/88 Keynote Powered by Rabbit 0.9.1

FAQ When will Rite available? I don't know, sorry. But it's a part of Japanese government funded two year project (2010-2011) 75/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite be Open-Source? Yes, probably under MIT license. But we need business model to satisfy the government. 76/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite be Open-Source? We might choose GPL plus commercial subscription model (a la MySQL). 77/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite replace MRI? No, Rite will not be a full- featured, universal implementation. 78/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite replace MRI? It is a Domain Speciﬁc Implementation, like Ruboto. 79/88 Keynote Powered by Rabbit 0.9.1

FAQ How about C API? Rite will have diﬀerent C API from CRuby. Currently we have no plan to provide compatibility layer. 80/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite support M17N? No, you have to conﬁgure single character encoding from ASCII or UTF-8 in compile time. 81/88 Keynote Powered by Rabbit 0.9.1

FAQ Will Rite support (native) threads? No, to use threads you can use multiple VM per native threads. Rite may support ﬁbers in the future. 82/88 Keynote Powered by Rabbit 0.9.1

FAQ Does Rite run faster than YARV/JRuby/Rubinius, etc? Probably Not, but maybe on some benchmarks due to ﬂoat immediate values and other techniques. 83/88 Keynote Powered by Rabbit 0.9.1

FAQ How can I contribute to Rite? Wait until we make it open- source. We will open it on github. 84/88 Keynote Powered by Rabbit 0.9.1

FAQ Rite sounds familier Originally Rite was a code name for the ﬁrst Ruby 2.0 virtual machine, which was replaced by YARV. It's coind from Ruby Lite. 85/88 Keynote Powered by Rabbit 0.9.1

FAQ Do you resign from CRuby? No, but I have spent less time on CRuby recently anyway. 86/88 Keynote Powered by Rabbit 0.9.1

FAQ Do you resign from CRuby? I will keep being a maintainer of CRuby. And above all, I will keep being active as the creator of the language and, the leader of the community. 87/88 Keynote Powered by Rabbit 0.9.1

Thank you! 88/88 Keynote Powered by Rabbit 0.9.1

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RubyConf 2010 Keynote by Matz

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