From 1b86d90136efb98c7b331a84ca163587307a49af Mon Sep 17 00:00:00 2001 From: "yuuji.yaginuma" Date: Thu, 17 May 2018 17:32:27 +0900 Subject: Enable `Performance/UnfreezeString` cop MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`. ```ruby # frozen_string_literal: true require "bundler/inline" gemfile(true) do source "https://rubygems.org" gem "benchmark-ips" end Benchmark.ips do |x| x.report('+@') { +"" } x.report('dup') { "".dup } x.compare! end ``` ``` $ ruby -v benchmark.rb ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux] Warming up -------------------------------------- +@ 282.289k i/100ms dup 187.638k i/100ms Calculating ------------------------------------- +@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s Comparison: +@: 6775299.3 i/s dup: 3320400.7 i/s - 2.04x slower ``` --- activesupport/lib/active_support/xml_mini/nokogirisax.rb | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'activesupport/lib/active_support/xml_mini/nokogirisax.rb') diff --git a/activesupport/lib/active_support/xml_mini/nokogirisax.rb b/activesupport/lib/active_support/xml_mini/nokogirisax.rb index b01ed00a14..0bbb4e258a 100644 --- a/activesupport/lib/active_support/xml_mini/nokogirisax.rb +++ b/activesupport/lib/active_support/xml_mini/nokogirisax.rb @@ -39,7 +39,7 @@ module ActiveSupport end def start_element(name, attrs = []) - new_hash = { CONTENT_KEY => "".dup }.merge!(Hash[attrs]) + new_hash = { CONTENT_KEY => +"" }.merge!(Hash[attrs]) new_hash[HASH_SIZE_KEY] = new_hash.size + 1 case current_hash[name] -- cgit v1.2.3 From aa3dcabd874a3e82e455e85a1c94a7abaac2900a Mon Sep 17 00:00:00 2001 From: Yasuo Honda Date: Wed, 28 Feb 2018 04:33:37 +0000 Subject: Add `Style/RedundantFreeze` to remove redudant `.freeze` Since Rails 6.0 will support Ruby 2.4.1 or higher `# frozen_string_literal: true` magic comment is enough to make string object frozen. This magic comment is enabled by `Style/FrozenStringLiteralComment` cop. * Exclude these files not to auto correct false positive `Regexp#freeze` - 'actionpack/lib/action_dispatch/journey/router/utils.rb' - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb' It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333 Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed. * Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required - 'actionpack/test/controller/test_case_test.rb' - 'activemodel/test/cases/type/string_test.rb' - 'activesupport/lib/active_support/core_ext/string/strip.rb' - 'activesupport/test/core_ext/string_ext_test.rb' - 'railties/test/generators/actions_test.rb' --- activesupport/lib/active_support/xml_mini/nokogirisax.rb | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'activesupport/lib/active_support/xml_mini/nokogirisax.rb') diff --git a/activesupport/lib/active_support/xml_mini/nokogirisax.rb b/activesupport/lib/active_support/xml_mini/nokogirisax.rb index 0bbb4e258a..55cd72e093 100644 --- a/activesupport/lib/active_support/xml_mini/nokogirisax.rb +++ b/activesupport/lib/active_support/xml_mini/nokogirisax.rb @@ -16,8 +16,8 @@ module ActiveSupport # Class that will build the hash while the XML document # is being parsed using SAX events. class HashBuilder < Nokogiri::XML::SAX::Document - CONTENT_KEY = "__content__".freeze - HASH_SIZE_KEY = "__hash_size__".freeze + CONTENT_KEY = "__content__" + HASH_SIZE_KEY = "__hash_size__" attr_reader :hash -- cgit v1.2.3