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| author | yuuji.yaginuma <yuuji.yaginuma@gmail.com> | 2018-05-17 17:32:27 +0900 |
|---|---|---|
| committer | yuuji.yaginuma <yuuji.yaginuma@gmail.com> | 2018-09-23 08:56:55 +0900 |
| commit | 1b86d90136efb98c7b331a84ca163587307a49af (patch) | |
| tree | 8d37adb501fb5b4b3abe8c17ea7383c7de5feb1b /activerecord/test/cases/core_test.rb | |
| parent | d3b952184d8bdb6154aff1f8bc3eda58046026f6 (diff) | |
| download | rails-1b86d90136efb98c7b331a84ca163587307a49af.tar.gz rails-1b86d90136efb98c7b331a84ca163587307a49af.tar.bz2 rails-1b86d90136efb98c7b331a84ca163587307a49af.zip | |
Enable `Performance/UnfreezeString` cop
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
```
Diffstat (limited to 'activerecord/test/cases/core_test.rb')
| -rw-r--r-- | activerecord/test/cases/core_test.rb | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/activerecord/test/cases/core_test.rb b/activerecord/test/cases/core_test.rb index 6e7ae2efb4..f7fbf3ee8a 100644 --- a/activerecord/test/cases/core_test.rb +++ b/activerecord/test/cases/core_test.rb @@ -36,7 +36,7 @@ class CoreTest < ActiveRecord::TestCase def test_pretty_print_new topic = Topic.new - actual = "".dup + actual = +"" PP.pp(topic, StringIO.new(actual)) expected = <<~PRETTY #<Topic:0xXXXXXX @@ -65,7 +65,7 @@ class CoreTest < ActiveRecord::TestCase def test_pretty_print_persisted topic = topics(:first) - actual = "".dup + actual = +"" PP.pp(topic, StringIO.new(actual)) expected = <<~PRETTY #<Topic:0x\\w+ @@ -93,7 +93,7 @@ class CoreTest < ActiveRecord::TestCase def test_pretty_print_uninitialized topic = Topic.allocate - actual = "".dup + actual = +"" PP.pp(topic, StringIO.new(actual)) expected = "#<Topic:XXXXXX not initialized>\n" assert actual.start_with?(expected.split("XXXXXX").first) @@ -106,7 +106,7 @@ class CoreTest < ActiveRecord::TestCase "inspecting topic" end end - actual = "".dup + actual = +"" PP.pp(subtopic.new, StringIO.new(actual)) assert_equal "inspecting topic\n", actual end |