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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 ``` |
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| .. | ||
| actionpack | ||
| comments | ||
| custom_pattern | ||
| customers | ||
| db_definitions | ||
| developers | ||
| digestor | ||
| fun | ||
| games | ||
| good_customers | ||
| helpers | ||
| helpers_missing | ||
| layout_tests/alt | ||
| layouts | ||
| mascots | ||
| override/test | ||
| override2/layouts/test | ||
| projects | ||
| public | ||
| replies | ||
| respond_to | ||
| test | ||
| topics | ||
| translations/templates | ||
| _top_level_partial.html.erb | ||
| _top_level_partial_only.erb | ||
| companies.yml | ||
| company.rb | ||
| developer.rb | ||
| developers.yml | ||
| developers_projects.yml | ||
| mascot.rb | ||
| mascots.yml | ||
| plain_text.raw | ||
| plain_text_with_characters.raw | ||
| project.rb | ||
| projects.yml | ||
| replies.yml | ||
| reply.rb | ||
| ruby_template.ruby | ||
| shared.html.erb | ||
| topic.rb | ||
| topics.yml | ||
| with_format.json.erb | ||