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Saw this while doing a review of a patch:
* Normalize case and punctuation across comments.
* ascii -> ASCII
* Since I was on it, some blank lines that visually
add some clarity IMO.
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We can save a few objects by freezing the `replacement` string. We save a few more by down-casing the string in memory instead of allocating a new one. We save far more objects by checking for the default separator `"-"`, and using pre-generated regular expressions.
We will save 209,231 bytes and 1,322 objects.
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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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Many methods in ActiveSupport::Inflector were actually documenting
the String methods with the same name.
For instance the doc for `camelize` said:
> If the argument to +camelize+ is set to <tt>:lower</tt>...
while it should say:
> If the +uppercase_first_letter+ parameter is set to false
[ci skip]
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This reverts commit e8feaff60b9c04d34ad234f7d17b5d2ad9cc7a24, reversing
changes made to 9adf28c026070afb78b80027521a4ddddd68d697.
Reason: This broke the actionmailer tests
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- access & filters don't use multibyte ext
- transliterate requires only AS::Multibyte but not multibyte ext
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Makes String#mb_chars on Ruby 1.9 return an instance of ActiveSupport::Multibyte::Chars to work around 1.9's lack of Unicode case folding.
Refactors class methods from ActiveSupport::Multibyte::Chars into new Unicode module, adding other related functionality for consistency.
[#4594 state:resolved]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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Signed-off-by: Xavier Noria <fxn@hashref.com>
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Ancillary changes: Moved Chars#normalize into a class method; removed
unused UTF_PAT constant.
Signed-off-by: José Valim <jose.valim@gmail.com>
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Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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a + sign is interpreted by the browser as a space, possibly resulting in a "ArgumentError: illegal character in key"
[#4080 state:committed]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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like constantize.
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