rails--rails/actionview/test/fixtures/ruby_template.ruby at 7f73db7366eaa4b53b209bbe0dc5a0818834feff - kotovalexarian-likes-github/rails--rails - Forgejo by Causa Arcana

kotovalexarian-likes-github/rails--rails

mirror of https://github.com/rails/rails.git synced 2022-11-09 12:12:34 -05:00

yuuji.yaginuma 1b86d90136 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

```

2018-09-23 08:56:55 +09:00

2 lines

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Ruby

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	`body = +""`
	`body << ["Hello", "from", "Ruby", "code"].join(" ")`