Rubyzino 44

* A few Ruby 2.5 features
* Ruby 3x3

Transcript

1. Rubyzino Thessaloniki Ruby Meetup 44 CocoaHeads Meetup 19
2. Today 19:10 | Rubyzino 19:20 | A closer look at Swift generics 19:40 | Break & socializing 20:00 | Migrating from Ruby on Rails to Serverless 21:00 | Halaruby
3. Ruby 2.5 December 25
4. [1].each do |n| begin # something which might raise an exception n / 0 rescue SomeExceptionClass => some_variable # code that deals with some exception else # code that runs only if *no* exception was raised ensure # ensure that this code always runs, no matter what # does not change the final value of the block end end
5. [1].each do |n| n / 0 rescue SomeExceptionClass => some_variable # code that deals with some exception else # code that runs only if *no* exception was raised ensure # ensure that this code always runs, no matter what # does not change the final value of the block end
6. Bundler gem is now bundled $ ruby -v ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-darwin16] $ bundler -v Bundler version 1.15.4
7. String#delete_prefix 'invisible'.delete_prefix('in') #=> "visible" 'pink'.delete_prefix('in') #=> "pink" String#delete_suffix 'worked'.delete_suffix('ed') #=> "work" 'medical'.delete_suffix('ed') #=> "medical"
8. binding.irb vs pry • require 'irb' is no longer needed in your code, in order to invoke binding.irb. • Show source around binding.irb is now shown on startup.
9. # test.rb: def test binding.irb end test # Running the file yields: From: test.rb @ line 2 : 1: def test => 2: binding.irb 3: end 4: test irb(main):001:0>
10. Integer.sqrt added # Ruby v2.4 Math.sqrt(10) #=> 3.1622776601683795 Math.sqrt(10).to_i #=> 3 # Ruby v2.5 Integer.sqrt(10) #=> 3
11. Hash#slice added {a: 1, b: 2, c: 3}.slice(:a, :b) #=> {:a=>1, :b=>2}
12. Unicode 10.0 support • Ruby 2.5 has been updated to support the new characters • Bitcoin symbol • 56 new emojis
13. Ruby 3x3? • Performance • Concurrency • Typing
14. Performance • Matz has announced that he wants Ruby 3 to be three times as fast as Ruby 2.0.0 • Ruby 2.5.0 head-of-master speedup is around 165% of the speed of Ruby 2.0.0
15. Concurrency Goals: • Retain compatibility with Ruby 2 • Allow for parallelism • Reconsider global locks that prevent parallel execution • ... and more Learn more: Concurrency in Ruby 3 with Guilds
16. Typing • "still figuring out the spec" on Ruby 3 changes to the type system. • Some on-paper proposals and some early implementations, but nothing is currently close to getting included as a standard part of the language.
19. Thanks! Let's start!