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Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.
* Exclude these files not to auto correct false positive `Regexp#freeze`
- 'actionpack/lib/action_dispatch/journey/router/utils.rb'
- 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.
* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required
- 'actionpack/test/controller/test_case_test.rb'
- 'activemodel/test/cases/type/string_test.rb'
- 'activesupport/lib/active_support/core_ext/string/strip.rb'
- 'activesupport/test/core_ext/string_ext_test.rb'
- 'railties/test/generators/actions_test.rb'
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See #29632 for details. In short, it's possible to enter `LoadError#is_missing?` when `LoadError#path` returns `nil`, leading to `path.sub` throwing an none-to-helpful `NoMethodError`.
This tiniest of patch inserts `#to_s` before the `sub` call to make sure it succeeds. Affected surface area should be just as tiny since something has already gone wrong to get us into `#is_missing?` and the current behavior when `#path` returns `nil` seems clearly not intended.
[Gannon McGibbon + Neil Souza]
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since 4ad1a52, `LoadError::REGEXPS` is no longer needed.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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Should have been removed via 8e43fc5ace8039370f233570863b34821a3be46f.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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I wrote a utility that helps find areas where you could optimize your program using a frozen string instead of a string literal, it's called [let_it_go](https://github.com/schneems/let_it_go). After going through the output and adding `.freeze` I was able to eliminate the creation of 1,114 string objects on EVERY request to [codetriage](codetriage.com). How does this impact execution?
To look at memory:
```ruby
require 'get_process_mem'
mem = GetProcessMem.new
GC.start
GC.disable
1_114.times { " " }
before = mem.mb
after = mem.mb
GC.enable
puts "Diff: #{after - before} mb"
```
Creating 1,114 string objects results in `Diff: 0.03125 mb` of RAM allocated on every request. Or 1mb every 32 requests.
To look at raw speed:
```ruby
require 'benchmark/ips'
number_of_objects_reduced = 1_114
Benchmark.ips do |x|
x.report("freeze") { number_of_objects_reduced.times { " ".freeze } }
x.report("no-freeze") { number_of_objects_reduced.times { " " } }
end
```
We get the results
```
Calculating -------------------------------------
freeze 1.428k i/100ms
no-freeze 609.000 i/100ms
-------------------------------------------------
freeze 14.363k (± 8.5%) i/s - 71.400k
no-freeze 6.084k (± 8.1%) i/s - 30.450k
```
Now we can do some maths:
```ruby
ips = 6_226k # iterations / 1 second
call_time_before = 1.0 / ips # seconds per iteration
ips = 15_254 # iterations / 1 second
call_time_after = 1.0 / ips # seconds per iteration
diff = call_time_before - call_time_after
number_of_objects_reduced * diff * 100
# => 0.4530373333993266 miliseconds saved per request
```
So we're shaving off 1 second of execution time for every 220 requests.
Is this going to be an insane speed boost to any Rails app: nope. Should we merge it: yep.
p.s. If you know of a method call that doesn't modify a string input such as [String#gsub](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37) please [give me a pull request to the appropriate file](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37), or open an issue in LetItGo so we can track and freeze more strings.
Keep those strings Frozen
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`MissingSourceFile` was just an alias to `LoadError` and was not
being raised inside the framework.
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[ci skip]
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[ci skip]
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Ruby2.0 already has LoadError#path.
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nil!)
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should probably remove MissingSourceFile and just monkey-patch LoadError instead of overriding LoadError.new.
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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4386 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1735 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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#925 [Nicholas Seckar]
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@990 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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Debugging helpers should be much easier now #980 [Nicholas Seckar]
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@985 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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