Road to RuboCop 1.0 - Speaker Deck

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Road to RuboCop 1.0 ,PJDIJ*50&4. *OD 3VCZ,BJHJ5BLFPVU Ride on RuboCop 1.0 for safe static analysis

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&4. *OD

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Support OSS community

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#FODINBSLJQT require 'benchmark/ips' SLUG = 'writing-fast-ruby' def slow SLUG.gsub('-', ' ') end def fast SLUG.tr('-', ' ') end Benchmark.ips do |x| x.report('String#gsub') { slow } x.report('String#tr') { fast } x.compare! end % ruby -v gsub-vs-tr.rb ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin17] Warming up -------------------------------------- String#gsub 59.463k i/100ms String#tr 296.069k i/100ms Calculating ------------------------------------- String#gsub 598.537k (± 1.8%) i/s - 3.033M in 5.068466s String#tr 2.955M (± 0.9%) i/s - 14.803M in 5.009464s Comparison: String#tr: 2955357.8 i/s String#gsub: 598537.4 i/s - 4.94x (± 0.00) slower

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MPDBM SFNPUF(JU)VC 3VCP$PQ1FSGPSNBODF 'FUDIPSJHJOBMSFQP 3VCP$PQ1FSGPSNBODF 3VCP$PQ$PSF % git remote add upstream-core \ % git fetch upstream-core

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MPDBM # DONE! % git push origin master SFNPUF(JU)VC 1VTIOFXSFQP 3VCP$PQ1FSGPSNBODF 3VCP$PQ$PSF 3VCP$PQ1FSGPSNBODF

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wPWFSDIFSSZQJDLT )PXNBOZDIFSSZQJDLT % git log --oneline lib/rubocop/cop/performance \ spec/rubocop/cop/performance | wc -l 225 % git log --oneline lib/rubocop/cop/rails \ spec/rubocop/cop/rails | wc -l 315 *NOPUTVSFJUJTUIFCFTUPQUJPO

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3VCP$PQ"451SPDFTTFE4PVSDF require 'rubocop-ast' ast = RuboCop::AST::ProcessedSource.new( 'puts "hello"', 2.7 ).ast #=>s(:send, nil, :puts, s(:str, "hello")) ast.class #=> RuboCop::AST::SendNode ast.send_type? #=> true ast.first_argument.basic_literal? #=> true

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3VCP$PQ"455SBWFSTBM require 'rubocop-ast' include RuboCop::AST::Traversal # Event handler for `send` node def on_send(node) 'hi' end walk(ast) #=> hi

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&YBNQMFEFGBVMUZNM Lint/RaiseException: VersionAdded: 0.56 + Safe: false Style/DoubleNegation: VersionAdded: '0.19' VersionChanged: '0.84' + SafeAutoCorrect: false

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&YBNQMF7BSJBCMF DPOTUBOU UZQFT # Performance/AncestorsInclude # bad A.ancestors.include?(B) # good A <= B

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&YBNQMFFYUFSOBMSFTPVSDFT # Rails/UniqBeforePluck cop # bad Model.pluck(:id).uniq # good Model.distinct.pluck(:id)

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