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 ``` --- .../test/core_ext/object/instance_variables_test.rb | 4 ++-- activesupport/test/core_ext/string_ext_test.rb | 18 +++++++++--------- 2 files changed, 11 insertions(+), 11 deletions(-) (limited to 'activesupport/test/core_ext') diff --git a/activesupport/test/core_ext/object/instance_variables_test.rb b/activesupport/test/core_ext/object/instance_variables_test.rb index a3d8daab5b..cf1fe5dfa4 100644 --- a/activesupport/test/core_ext/object/instance_variables_test.rb +++ b/activesupport/test/core_ext/object/instance_variables_test.rb @@ -19,7 +19,7 @@ class ObjectInstanceVariableTest < ActiveSupport::TestCase end def test_instance_exec_passes_arguments_to_block - assert_equal %w(hello goodbye), "hello".dup.instance_exec("goodbye") { |v| [self, v] } + assert_equal %w(hello goodbye), (+"hello").instance_exec("goodbye") { |v| [self, v] } end def test_instance_exec_with_frozen_obj @@ -27,7 +27,7 @@ class ObjectInstanceVariableTest < ActiveSupport::TestCase end def test_instance_exec_nested - assert_equal %w(goodbye olleh bar), "hello".dup.instance_exec("goodbye") { |arg| + assert_equal %w(goodbye olleh bar), (+"hello").instance_exec("goodbye") { |arg| [arg] + instance_exec("bar") { |v| [reverse, v] } } end end diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb index b8de16cc5e..81299e5b58 100644 --- a/activesupport/test/core_ext/string_ext_test.rb +++ b/activesupport/test/core_ext/string_ext_test.rb @@ -245,8 +245,8 @@ class StringInflectionsTest < ActiveSupport::TestCase end def test_string_squish - original = %{\u205f\u3000 A string surrounded by various unicode spaces, - with tabs(\t\t), newlines(\n\n), unicode nextlines(\u0085\u0085) and many spaces( ). \u00a0\u2007}.dup + original = +%{\u205f\u3000 A string surrounded by various unicode spaces, + with tabs(\t\t), newlines(\n\n), unicode nextlines(\u0085\u0085) and many spaces( ). \u00a0\u2007} expected = "A string surrounded by various unicode spaces, " \ "with tabs( ), newlines( ), unicode nextlines( ) and many spaces( )." @@ -378,8 +378,8 @@ class StringInflectionsTest < ActiveSupport::TestCase end def test_truncate_multibyte - assert_equal "\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 ...".dup.force_encoding(Encoding::UTF_8), - "\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 \354\225\204\353\235\274\353\246\254\354\230\244".dup.force_encoding(Encoding::UTF_8).truncate(10) + assert_equal (+"\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 ...").force_encoding(Encoding::UTF_8), + (+"\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 \354\225\204\353\235\274\353\246\254\354\230\244").force_encoding(Encoding::UTF_8).truncate(10) end def test_truncate_should_not_be_html_safe @@ -400,7 +400,7 @@ class StringInflectionsTest < ActiveSupport::TestCase end def test_remove! - original = "This is a very good day to die".dup + original = +"This is a very good day to die" assert_equal "This is a good day to die", original.remove!(" very") assert_equal "This is a good day to die", original assert_equal "This is a good day", original.remove!(" to ", /die/) @@ -733,7 +733,7 @@ end class OutputSafetyTest < ActiveSupport::TestCase def setup - @string = "hello".dup + @string = +"hello" @object = Class.new(Object) do def to_s "other" @@ -809,7 +809,7 @@ class OutputSafetyTest < ActiveSupport::TestCase end test "Concatting safe onto unsafe yields unsafe" do - @other_string = "other".dup + @other_string = +"other" string = @string.html_safe @other_string.concat(string) @@ -832,7 +832,7 @@ class OutputSafetyTest < ActiveSupport::TestCase end test "Concatting safe onto unsafe with << yields unsafe" do - @other_string = "other".dup + @other_string = +"other" string = @string.html_safe @other_string << string @@ -888,7 +888,7 @@ class OutputSafetyTest < ActiveSupport::TestCase test "Concatting an integer to safe always yields safe" do string = @string.html_safe string = string.concat(13) - assert_equal "hello".dup.concat(13), string + assert_equal (+"hello").concat(13), string assert_predicate string, :html_safe? end -- cgit v1.2.3