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 ``` --- activerecord/lib/active_record/tasks/database_tasks.rb | 2 +- activerecord/lib/active_record/tasks/mysql_database_tasks.rb | 2 +- activerecord/lib/active_record/tasks/postgresql_database_tasks.rb | 2 +- activerecord/lib/active_record/tasks/sqlite_database_tasks.rb | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) (limited to 'activerecord/lib/active_record/tasks') diff --git a/activerecord/lib/active_record/tasks/database_tasks.rb b/activerecord/lib/active_record/tasks/database_tasks.rb index 16e66982e5..5e29085aff 100644 --- a/activerecord/lib/active_record/tasks/database_tasks.rb +++ b/activerecord/lib/active_record/tasks/database_tasks.rb @@ -307,7 +307,7 @@ module ActiveRecord def check_schema_file(filename) unless File.exist?(filename) - message = %{#{filename} doesn't exist yet. Run `rails db:migrate` to create it, then try again.}.dup + message = +%{#{filename} doesn't exist yet. Run `rails db:migrate` to create it, then try again.} message << %{ If you do not intend to use a database, you should instead alter #{Rails.root}/config/application.rb to limit the frameworks that will be loaded.} if defined?(::Rails.root) Kernel.abort message end diff --git a/activerecord/lib/active_record/tasks/mysql_database_tasks.rb b/activerecord/lib/active_record/tasks/mysql_database_tasks.rb index eddc6fa223..1c1b29b5e1 100644 --- a/activerecord/lib/active_record/tasks/mysql_database_tasks.rb +++ b/activerecord/lib/active_record/tasks/mysql_database_tasks.rb @@ -104,7 +104,7 @@ module ActiveRecord end def run_cmd_error(cmd, args, action) - msg = "failed to execute: `#{cmd}`\n".dup + msg = +"failed to execute: `#{cmd}`\n" msg << "Please check the output above for any errors and make sure that `#{cmd}` is installed in your PATH and has proper permissions.\n\n" msg end diff --git a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb index 029f763158..4da918ada3 100644 --- a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb +++ b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb @@ -115,7 +115,7 @@ module ActiveRecord end def run_cmd_error(cmd, args, action) - msg = "failed to execute:\n".dup + msg = +"failed to execute:\n" msg << "#{cmd} #{args.join(' ')}\n\n" msg << "Please check the output above for any errors and make sure that `#{cmd}` is installed in your PATH and has proper permissions.\n\n" msg diff --git a/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb b/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb index d0bad05176..a82cea80ca 100644 --- a/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb +++ b/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb @@ -67,7 +67,7 @@ module ActiveRecord end def run_cmd_error(cmd, args) - msg = "failed to execute:\n".dup + msg = +"failed to execute:\n" msg << "#{cmd} #{args.join(' ')}\n\n" msg << "Please check the output above for any errors and make sure that `#{cmd}` is installed in your PATH and has proper permissions.\n\n" msg -- cgit v1.2.3