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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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actions_test.rb | ||
api_app_generator_test.rb | ||
app_generator_test.rb | ||
application_record_generator_test.rb | ||
argv_scrubber_test.rb | ||
assets_generator_test.rb | ||
channel_generator_test.rb | ||
controller_generator_test.rb | ||
create_migration_test.rb | ||
generated_attribute_test.rb | ||
generator_generator_test.rb | ||
generator_test.rb | ||
generators_test_helper.rb | ||
helper_generator_test.rb | ||
integration_test_generator_test.rb | ||
job_generator_test.rb | ||
mailer_generator_test.rb | ||
migration_generator_test.rb | ||
model_generator_test.rb | ||
named_base_test.rb | ||
namespaced_generators_test.rb | ||
orm_test.rb | ||
plugin_generator_test.rb | ||
plugin_test_helper.rb | ||
plugin_test_runner_test.rb | ||
resource_generator_test.rb | ||
scaffold_controller_generator_test.rb | ||
scaffold_generator_test.rb | ||
shared_generator_tests.rb | ||
system_test_generator_test.rb | ||
task_generator_test.rb | ||
test_runner_in_engine_test.rb |