[Wroc_Love.rb 2018] [Lightning Talk] To refine or not to refine

Links:
- Interview with Akira Matsuda http://rubynoname.ru/posts/2017/S08E08.html
- http://gemcheck.evilmartians.io

https://twitter.com/palkan_tula

Transcript

1. TO REFINE OR NOT TO REFINE Vladimir Dementyev
3. HISTORY Introduced in Ruby 2.0.0 Has been experimental until 2.1
4. “Developed my Matz’s boss, Shugo” “Initially was more powerful but JRuby…" "Koichi Sasada wants to remove Refinements” http://rubynoname.ru/posts/2017/S08E08.html *2016
5. EXAMPLES asakusarb/action_args amatsuda/database_rewinder
6. EXAMPLES
7. EXAMPLES https://github.com/rails/rails/pull/27363
8. USE CASES
9. DEPENDENCY REDUCTION module Anyway ::HashExt refine Hash do def stringify_keys! keys.each do |key| val = delete(key) val.stringify_keys! if val.is_a?(Hash) self[key.to_s] = val end end end end https://github.com/palkan/anyway_config
10. class Anyway ::Config using Anyway ::Ext ::DeepDup using Anyway ::Ext ::Hash def self.attr_config(*args, **hargs) @defaults = hargs.deep_dup defaults.stringify_keys! @config_attributes = args + defaults.keys attr_accessor(*@config_attributes) end end https://github.com/palkan/anyway_config DEPENDENCY REDUCTION
11. MODERNIZATION module ThreadFetch # Thread.fetch is only available since 2.5 refine Thread do def fetch(key, fallback = : __undef __) raise KeyError, "key not found: #{key}" if !key?(key) && fallback == : __undef __ self[key] || fallback end end end https://github.com/palkan/isolator
12. PERFECT PRIVACY if Array.instance_methods(false).include?(:sum) && !(%w[a].sum rescue false) # Using Refinements here in # order not to expose our internal method using Module.new { refine Array do alias :orig_sum :sum end } #… end https://github.com/rails/rails/pull/27363/files
13. DSL https://github.com/k-tsj/pattern-match using PatternMatch match(object) do with(pattern[, guard]) do ... end with(pattern[, guard]) do ... end ... end
14. to_proc https://github.com/palkan/clowne # Add to_proc method for lambda module LambdaAsProc refine Proc do def to_proc return self unless lambda? this = self proc { |*args| this.call(*args.take(this.arity)) } end end end
15. SYNTAX SUGAR https://github.com/palkan/test-prof using FloatDuration using StringStripHeredoc msg = <<-MSG.strip_heredoc EventProf results for #{@profiler.event} Total time: #{@profiler.total_time.duration} MSG
16. #PROTIP module Json refine Integer do def to_json to_s end end end using Json p Module.used_modules # => [Json]
17. TRUFFLE BONUS
18. PROBLEMS?
19. PROBLEMS
20. PROBLEMS module Json refine Integer do def to_json to_s end end end using Json p 1.send(:to_json) # => "1" p 1.public_send(:to_json) # => NoMethodError
21. PROBLEMS
22. KONIEC?
23. GemCheck http://gemcheck.evilmartians.io