The Crystal language *recently* update
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The document discusses the Crystal programming language. It notes that Crystal has had 12 minor version releases in the past year, with over 72 breaking changes, 200 new methods and macros added, and many bugs fixed. Some key updates discussed include the addition of 'crystal play' and 'crystal tool format' commands, removal of global variables, and updated syntax for class definitions. The conclusion encourages trying Crystal and joining the Crystal JP user group.
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The Crystal language *recently* update
- 1. The Crystal language *recently* updates @karupanerura Ruby Kaigi 2016 LT
- 2. How about me • @karupanerura (Twitter/Github/etc..) • Perl/Python/Go/Crystal/Swift/ES2016/etc.. • Maintener of mRuby.pm (mruby Perl binding) • Director of Japan Perl Association • Of cause, I like Perl and Ruby also :)
- 4. Well..
- 5. This talk’s topic is the Crystal language
- 6. Do you know about the Crystal language?
- 7. The Crystal language is … • Ruby like syntax and APIs • static typing & union type & type inference • nil safe • self hosting compiler (using llvm) • SEE ALSO: https://crystal-lang.org/
- 8. It works # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |context| context.response.content_type = "text/plain" context.response.print "Hello world" end puts "Listening on http://0.0.0.0:8080" server.listen # Copied from: https://crystal-lang.org/
- 9. It works # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |context| context.response.content_type = "text/plain" context.response.print "Hello world" end puts "Listening on http://0.0.0.0:8080" server.listen # Copied from: https://crystal-lang.org/ Load module (at compile time)
- 10. It works # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |context| context.response.content_type = "text/plain" context.response.print "Hello world" end puts "Listening on http://0.0.0.0:8080" server.listen # Copied from: https://crystal-lang.org/ type inference as HTTP::Server
- 11. It works # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |context| context.response.content_type = "text/plain" context.response.print "Hello world" end puts "Listening on http://0.0.0.0:8080" server.listen # Copied from: https://crystal-lang.org/ type inference as HTTP::Server::Context
- 12. It works # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |context| context.response.content_type = "text/plain" context.response.print "Hello world" end puts "Listening on http://0.0.0.0:8080" server.listen # Copied from: https://crystal-lang.org/ yield code block
- 13. type inference in arguments # https://github.com/crystal-lang/ crystal/blob/master/src/io.cr#L262 module IO def <<(obj) : self obj.to_s self self end end
- 14. type inference in arguments # https://github.com/crystal-lang/ crystal/blob/master/src/io.cr#L262 module IO def <<(obj) : self obj.to_s self self end end type inference as Class having #to_s (using union type: String|Integer|etc..)
- 15. language updates
- 16. YOU SHOULD READ IT https://github.com/crystal- lang/crystal/blob/master/ CHANGELOG.md
- 17. It’s kidding :p but, you can do that :)
- 18. Release dates • 0.19.0 (2016-09-02) • 0.18.0 (2016-06-14) • 0.17.0 (2016-05-17) • 0.16.0 (2016-05-05) • 0.15.0 (2016-03-31) • 0.14.0 (2016-03-21) • 0.13.0 (2016-03-07) • 0.12.0 (2016-02-16) • 0.11.0 (2016-01-23) • 0.10.0 (2015-12-23) • 0.9.0 (2015-10-16) • 0.8.0 (2015-09-19)
- 19. Release times • 0.19.0 (2016-09-02) • 0.18.0 (2016-06-14) • 0.17.0 (2016-05-17) • 0.16.0 (2016-05-05) • 0.15.0 (2016-03-31) • 0.14.0 (2016-03-21) • 0.13.0 (2016-03-07) • 0.12.0 (2016-02-16) • 0.11.0 (2016-01-23) • 0.10.0 (2015-12-23) • 0.9.0 (2015-10-16) • 0.8.0 (2015-09-19) 12 minor version up releases in a year
- 20. Summary of changes in a year • 12 minor version up releases • 72 breaking changes • 200+ methods/macros are added • Some methods/macros are removed/renamed • Many bug fixes and some micro-optimizations
- 21. (My) Featured new features
- 24. $global variable is removed 👍👍👍👍👍👍👍👍👍👍 👍👍👍👍👍👍👍👍👍👍 👍👍👍👍👍👍👍👍👍👍 👍👍👍👍👍👍👍👍👍👍 👍👍👍👍👍👍👍👍👍👍 👍👍👍👍👍👍👍👍👍👍
- 25. Int#to_s(Int) 255.to_s(2) # => "11111111" 255.to_s(8) # => "377" 255.to_s(10) # => "255" 255.to_s(16) # => "ff"
- 26. Updated syntax (before) class Foo getter foo :: Int32 getter bar :: String def initialize(@foo, @bar) end end pp Foo.new(1, "matz")
- 27. Updated syntax (after) class Foo getter foo : Int32 getter bar : String def initialize(@foo, @bar) end end pp Foo.new(1, "matz")
- 28. and more…
- 29. Conclusion
- 30. Conclusion • Crystal is still improved • updating the syntaxes/APIs • self hosting compiler is stable (I think) • Join to Crystal JP (Crystal UG in Japan) • http://crystal.connpass.org/
- 32. Thank you 🍺🍣🍶