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Title: GitHub - fastruby/fast-ruby: :dash: Writing Fast Ruby -- Collect Common Ruby idioms.

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Read the rationale herehttps://github.com/fastruby/fast-ruby/pull/200
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rails/rails@3413b88https://github.com/rails/rails/commit/3413b88
Replace map.flatten with flat_maphttps://github.com/rails/rails/commit/817fe31196dd59ee31f71ef1740122b6759cf16d
Replace map.flatten(1) with flat_maphttps://github.com/rails/rails/commit/b11ebf1d80e4fb124f0ce0448cea30988256da59
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rails/rails#17244https://github.com/rails/rails/pull/17244
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https://github.com/fastruby/fast-ruby#hash-vs-hashfetch-code
Symbol GC in Ruby 2.2http://www.sitepoint.com/symbol-gc-ruby-2-2/
Unraveling String Key Performance in Ruby 2.2http://www.sitepoint.com/unraveling-string-key-performance-ruby-2-2/
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https://github.com/fastruby/fast-ruby#hashdig-vs-hash-vs-hashfetch-code
Ruby 2.3 introduced Hash#dighttp://ruby-doc.org/core-2.3.0/Hash.html#method-i-dig
#102 (comment)https://github.com/fastruby/fast-ruby/pull/102#issuecomment-198827506
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https://github.com/fastruby/fast-ruby#hash-vs-hashdup-code
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https://github.com/fastruby/fast-ruby#hashfetch-with-argument-vs-hashfetch--block-code
#39 (comment)https://github.com/fastruby/fast-ruby/issues/39#issuecomment-103989335
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#42https://github.com/fastruby/fast-ruby/pull/42#issue-93502261
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https://github.com/fastruby/fast-ruby#proc--block
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https://github.com/fastruby/fast-ruby#block-vs-symbolto_proc-code
rails/rails#16833https://github.com/rails/rails/pull/16833
codehttps://github.com/fastruby/fast-ruby/blob/main/code/proc-and-block/proc-call-vs-yield.rb
https://github.com/fastruby/fast-ruby#proccall-and-block-arguments-vs-yield-code
https://github.com/fastruby/fast-ruby#string
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/dup-vs-unary-plus.rb
https://github.com/fastruby/fast-ruby#stringdup-vs-string-code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/casecmp-vs-downcase-==.rb
https://github.com/fastruby/fast-ruby#stringcasecmp-vs--stringcasecmp-vs-stringdowncase---code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/concatenation.rb
https://github.com/fastruby/fast-ruby#string-concatenation-code
code (start)https://github.com/fastruby/fast-ruby/blob/main/code/string/start-string-checking-match-vs-start_with.rb
code (end)https://github.com/fastruby/fast-ruby/blob/main/code/string/end-string-checking-match-vs-end_with.rb
https://github.com/fastruby/fast-ruby#stringmatch-vs-stringmatch-vs-stringstart_withstringend_with-code-start-code-end
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/start_with-vs-substring-==.rb
https://github.com/fastruby/fast-ruby#stringstart_with-vs-string-code
code https://github.com/fastruby/fast-ruby/blob/main/code/string/===-vs-=~-vs-match.rb
https://github.com/fastruby/fast-ruby#regexp-vs-regexpmatch-vs-regexpmatch-vs-stringmatch-vs-string-vs-stringmatch-code-
provideshttp://guides.rubyonrails.org/v5.1/active_support_core_extensions.html#match-questionmark
#59https://github.com/fastruby/fast-ruby/pull/59
#62https://github.com/fastruby/fast-ruby/pull/62
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/gsub-vs-sub.rb
https://github.com/fastruby/fast-ruby#stringgsub-vs-stringsub-vs-string-code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/gsub-vs-tr.rb
https://github.com/fastruby/fast-ruby#stringgsub-vs-stringtr-code
rails/rails#17257https://github.com/rails/rails/pull/17257
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/gsub-vs-tr-vs-delete.rb
https://github.com/fastruby/fast-ruby#stringgsub-vs-stringtr-vs-stringdelete-code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/mutable_vs_immutable_strings.rb
https://github.com/fastruby/fast-ruby#mutable-vs-immutable-code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/sub!-vs-gsub!-vs-%5B%5D=.rb
https://github.com/fastruby/fast-ruby#stringsub-vs-stringgsub-vs-string-code
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/sub-vs-delete_prefix.rb
https://github.com/fastruby/fast-ruby#stringsub-vs-stringdelete_prefix-code
Ruby 2.5 introducedhttps://bugs.ruby-lang.org/issues/12694
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/sub-vs-chomp-vs-delete_suffix.rb
https://github.com/fastruby/fast-ruby#stringsub-vs-stringchomp-vs-stringdelete_suffix-code
Ruby 2.5 introducedhttps://bugs.ruby-lang.org/issues/13665
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/unpack1-vs-unpack%5B0%5D.rb
https://github.com/fastruby/fast-ruby#stringunpack1-vs-stringunpack0-code
Ruby 2.4.0 introduced unpack1https://bugs.ruby-lang.org/issues/12752
codehttps://github.com/fastruby/fast-ruby/blob/main/code/string/remove-extra-spaces-or-other-chars.rb
https://github.com/fastruby/fast-ruby#remove-extra-spaces-or-other-contiguous-characters-code
https://github.com/fastruby/fast-ruby#time
codehttps://github.com/fastruby/fast-ruby/blob/main/code/time/iso8601-vs-parse.rb
https://github.com/fastruby/fast-ruby#timeiso8601-vs-timeparse-code
https://github.com/fastruby/fast-ruby#range
codehttps://github.com/fastruby/fast-ruby/blob/main/code/range/cover-vs-include.rb
https://github.com/fastruby/fast-ruby#cover-vs-include-code
https://github.com/fastruby/fast-ruby#less-idiomatic-but-with-significant-performance-ruby
https://github.com/fastruby/fast-ruby/wiki/Less-idiomatic-but-with-significant-performance-differencehttps://github.com/fastruby/fast-ruby/wiki/Less-idiomatic-but-with-significant-performance-difference
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