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Ruby 3 Redux
Bozhidar Batsov
April 11, 2019
Programming
0
220
Ruby 3 Redux
Slide deck from my presentation at RubyDay 2019 in Verona, Italy.
Bozhidar Batsov
April 11, 2019
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Transcript
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Ciao!
Божидар
Bozhidar
Bozhidar
Bug cool
@bbatsov
Sofia, Bulgaria Sofia, Bulgaria
None
None
bbatsov
metaredux.com
Ruby & Rails style guides
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None
None
None
None
None
Not on Ruby’s Core Team
None
None
None
None
Matz on Ruby
Language Maturity
The Ruby Community
Ruby is not dying
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None
We have to feed the community intellectually. — Matz
We have to keep moving forward. — Matz
Backwards Compatibility
We’re not going to repeat the Python 3 mistakes! —
Matz
Victim of the Hype Cycle
None
Rails Mania (2008)
Ruby Today
Ruby Today
2025
Matz’s Retirement
None
Ruby 4
Ruby 4x4
Ruby 4 is going to be 4 times faster than
Ruby 3
Ruby 4 is going to be 12 times faster than
Ruby 2
Ruby 4 is finally going to be fast enough!
None
What about Ruby 3?
–Matz “We’ll aim to release Ruby 3 for the Olympic
Games in Tokyo in 2020.”
Ruby 3 Goals •Improved programming safety •Faster performance •Better concurrency/parallelism
support •Better tools
Optional static typing?
Duck inference?
Actors?
Stream based model?
Ownership based model?
Guilds?
3 times faster performance?
Smaller Goals •Sane keyword arguments (?!!?!) •Pattern Matching •Deprecation of
quirky features •Frozen string literals
None
Ruby 3.0 Redux
Dictionary Definitions
Ruby
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
3
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.
Redux
adjective 1. brought back, revived Emacs era redux 2. (usually
postpositive) (esp of an artistic work) presented in a new way Apocalypse Now Redux
None
Ruby 3.0 is not a single magic release
Ruby 3.0 is an idea
None
Ruby follows SemVer
Ruby 3 is going to be 3 times faster than
Ruby 2.0
Generational GC (Ruby 2.1)
Incremental GC (Ruby 2.2)
MJIT (Ruby 2.6)
Deprecation of flip-flops (Ruby 2.6)
Ruby 2.7
Numbered block parameters
numbers.map { Math.log2(@1) }
foo.bar { @1 + @2 }
h = Hash.new { @1[@2] = "Go Fish: #{@2}" }
h = Hash.new { @1[@2] = "Go Fish: #{@2}" }
None
https://bugs.ruby-lang.org/issues/15723
Method reference operator
[2, 4, 8, 16, 32].map { |n| Math.log2(n) }
[2, 4, 8, 16, 32].map(&method(Math.log2))
[2, 4, 8, 16, 32].map(&Math.:log2)
[2, 4, 8, 16, 32].map { Math.log2($1) }
Beginless range
Beginless range
Beginningless range
arr[..3]
items.where(price: ..20)
None
Ruby 3.0 (Current Status)
Better Tools
RubyGems 3
The bundling of Bundler (Ruby 2.6)
Gemifying the Standard Library (ongoing progress)
Default vs Bundled Gems
Default Gems • Bundler • RubyGems • date • irb
• json • …
Bundled Gems • minitest • did_you_mean • rake • …
stdgems.org
Ruby 3x3
Only applies to certain benchmarks
Ruby 2.6 is 65% faster than Ruby 2.0
None
10% average speedup per release
None
MJIT is the biggest hope for Ruby 3x3
Guilds
None
None
Developed outside the Ruby’s main repo
https://github.com/ko1/ruby/tree/guild
Work in progress ™
Parallel Programming in Ruby 3 with Guilds (http://www.atdot.net/~ko1/activities/2018_rubyconf2018.pdf)
Sane Keyword Arguments
https://bugs.ruby-lang.org/issues/14183
# The following calls pass keyword arguments foo(..., key: val)
foo(..., **hsh) foo(..., key: val, **hsh)
# The following calls pass **normal** arguments foo(..., {key: val})
foo(..., hsh) foo(..., {key: val, **hsh})
Breaking change!!!
Migration warning in Ruby 2.7
Pattern Matching (https://bugs.ruby-lang.org/issues/14912)
What’s not in Ruby 3.0?
Optional Static Typing
Actors
Stream processing
Frozen string literals
Deprecation of autoload
Community Impact
Community Contributed Features • UTF-8 • Enumerator • Generational GC
• Keyword Arguments • JIT • Concurrency
Community Contributions • Rake • Bundler • Documentation & Tutorials
• A ton of amazing libraries • Rails • …
None
Real Namespaces (https://bugs.ruby-lang.org/issues/14982)
RubyKaigi Updates
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Felina
Grazie! twitter: @bbatsov github: @bbatsov https://metaredux.com https://emacsredux.com RubyDay 2019 Verona,
Italy 11.04.2019