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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 /activesupport/test/multibyte_test_helpers.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 'activesupport/test/multibyte_test_helpers.rb')
| -rw-r--r-- | activesupport/test/multibyte_test_helpers.rb | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/test/multibyte_test_helpers.rb b/activesupport/test/multibyte_test_helpers.rb index 98f36aa939..d97ce6727a 100644 --- a/activesupport/test/multibyte_test_helpers.rb +++ b/activesupport/test/multibyte_test_helpers.rb @@ -29,7 +29,7 @@ module MultibyteTestHelpers UNICODE_STRING = "こにちわ".freeze ASCII_STRING = "ohayo".freeze - BYTE_STRING = "\270\236\010\210\245".dup.force_encoding("ASCII-8BIT").freeze + BYTE_STRING = (+"\270\236\010\210\245").force_encoding("ASCII-8BIT").freeze def chars(str) ActiveSupport::Multibyte::Chars.new(str) |