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Feeding the Sharks
Ruby Association
Heroku
@yukihiro_matz
Yukihiro "Matz" Matsumoto
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or
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Clash of Types
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OSS Community is like a shark
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Especially developers' community
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We have to move forward, or die
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If we lose interest, we will go away
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To somewhere else, more interesting
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We have to attract the community
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Somehow
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By showing how to earn money
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Rails!
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By enlightening people
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Philosophy
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By showing the future
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The possible future
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Past Keynotes of RubyConf
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I gave presentations about the future
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RubyConf 2001
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The first RubyConf in Tampa
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Virtual Machine
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Virtual Machine (1.9 2007)
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RubyConf 2002
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In Seattle
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M17N
Native thread
Generational GC
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M17N (1.9 2007)
Native thread (1.9 2007)
Generational GC (2.1 2013)
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RubyConf 2003
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In Austin
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Local variable scope
Multiple assignment
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Optional static type
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Local variable scope (--)
Multiple assignment(1.9 2007)
Keyword argument (2.0 2013)
Method combination (2.0 2013)
Selector namespace (2.0 2013)
Optional static type (--)
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RubyConf 2004
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In Washington DC
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My yougest daughter was born
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Brad Cox gave a keynote
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Koichi gave his first talk on YARV
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RubyConf 2005
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In San Diego
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Stabby lambda (->)
Real multi-value
Traits
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Stabby lambda (1.9 2007)
Real multi-value (--)
Traits (--)
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RubyConf 2006
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In Denver
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Bikeshed argument encouraged
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No new ideas
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RubyConf 2007
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In Charlotte
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1.9 introduced
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No new ideas
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RubyConf 2008
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In Portland
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Philosophy explained
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No new ideas
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RubyConf 2009
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In San Francisco
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Power of DSL explained
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RubyKaigi 2009
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Complex literal
Rational literal
True division (1/2 => 1/2)
Bitmap marking
Symbol GC
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Complex literal (2.1 2013)
Rational (2.1 2013)
True division (--)
Bitmap marking (2.0 2013)
Symbol GC (2.2 2014)
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RubyConf 2010
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In New Orleans
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Mix (traits)
Module#prepend
Refinement
Rite (mruby)
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Mix (--)
Module#prepend (2.0 2013)
Refinement (2.0 2013)
mruby (2012)
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RubyConf 2011-2013
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New Orleans, Denver and Miami
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No new ideas
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After all,
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Some may become true, some may
not
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False rate
7/22 ≒ 32%
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2001-2005
Exciting (but uncertain) ideas
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2006-2008
Nothing new, but philosophy
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2009-2013
Improving implementation
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We need fuel to move on
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It's about time start talking about:
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Ruby 3.0
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Ruby 2.2
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May happen in next 10 years
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Concurrency
JIT
Static typing
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Concurrency
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JIT (LLVM?)
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Static typing
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Static typing?
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All new kids in the street
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Scala
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TypeScript
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Dart
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Go
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Why not Ruby?
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Clash of Types
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Feature #9999
by Davide D'Agostino
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Type Annotations
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def connect(r -> Stream, c -> Client) -> Fiber
...
end
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Python
PEP: 3107
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Function Annotations
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def connect(r: Stream, c: Client) -> Fiber:
...
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mypy
Optional static type checker
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Benefits of static typing?
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Performance
Compile-time check
Documentation
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Performance
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No one complains for faster Ruby
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But do we really need static typing
for speed?
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JavaScript V8
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LuaJIT
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JIT
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Specialization
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Performace with dynamic typing
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We don't need static typing for speed
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Compile-time check
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Static analysis
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Refactoring
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Test coverage
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But less flexible
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Against Duck typing
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Documentation
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Much better than comments
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No contradiction
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No investigation into details
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That is PEP-3107's intention
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Why not static typing?
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Duck typing
Optional
DRY
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Duck typing
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Static typing is against duck typing
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Guy Decoux
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Optional
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Optional typing is only useful with
99% coverage
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TypeScript
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dynamic
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Ruby without duck typing, really
Ruby?
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Ruby should keep being Ruby,
forever
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DRY
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Don't Repeat Yourself
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Avoid duplication
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Static typing is against DRY principle
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Code & Declaration
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Soft-typing[1]
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[1] Soft Typing, Robert Cartwright
and Mike Fagan, 1991
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[2] Soft typing: An approach to type
checking for dynamically typed
languages, Mike Fagan, 1991
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No declaration needed
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Best-effort type checker
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Based on duck typing
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Type inference
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a=1 # type of a is Integer
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# x requires to have to_int
def foo(x)
print x.to_int
end
foo(1) # OK: 1 has to_int
foo("a") # NG: "a" does not have to_int
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Type is represented by:
Set of methods
name
number and type of arguments
Class (as set of methods)
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Compile-time check
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Best-effort type checker
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Targets subset of the language
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Restricted dynamic nature
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For example,
require
define_method
method_missing
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Documentation
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Unlike other languages
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You don't tell compiler types
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Compiler will guess your intention
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And report back to you
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And generates doc / IDE info
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Closer communication between
compiler and you
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Soft typing means 2 languages in one
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Statically soft typed language
Dynamic typed language
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When soft typing is not applicable
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It fallbacks to dynamic typing
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Strongly encouraging the former
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First, it should be done by a static
analyzer
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For quicker error detection
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Or for better IDE integration
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This is just an idea
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May or may not happen
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But it's about time to start new things
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That leads us Ruby 3.0
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Prepare for the future
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Happy hacking
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Thank you

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