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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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= Action View Action View is a framework for handling view template lookup and rendering, and provides view helpers that assist when building HTML forms, Atom feeds and more. Template formats that Action View handles are ERB (embedded Ruby, typically used to inline short Ruby snippets inside HTML), and XML Builder. == Download and installation The latest version of Action View can be installed with RubyGems: $ gem install actionview Source code can be downloaded as part of the Rails project on GitHub: * https://github.com/rails/rails/tree/master/actionview == License Action View is released under the MIT license: * https://opensource.org/licenses/MIT == Support API documentation is at * http://api.rubyonrails.org Bug reports for the Ruby on Rails project can be filed here: * https://github.com/rails/rails/issues Feature requests should be discussed on the rails-core mailing list here: * https://groups.google.com/forum/?fromgroups#!forum/rubyonrails-core