 Watson
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95e9fa5010
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Use String#=~ and Regexp.last_match instead to retrieve the markup content
If the first value is only used obtained with String#scan,
it will increase the performance if replace with `String#=~` and `Regexp.last_match`.
### Environment
- MacBook Air (M1, 2020)
- macOS 12.0 beta 7
- Apple M1
- Ruby 3.0.2
### Test code
```ruby
require 'benchmark/ips'
WhitespaceControl = '-'
VariableStart = /\{\{/
VariableEnd = /\}\}/
ContentOfVariable = /\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
token = "{{item.product.featured_image | product_img_url: 'thumb' }}"
Benchmark.ips do |x|
x.report("String#scan") { token.scan(ContentOfVariable) {|content| break } }
x.report("String#match") { m = token.match(ContentOfVariable); m[1] }
x.report("String#=~") { token =~ ContentOfVariable; Regexp.last_match(1) }
x.compare!
end
```
### Result
```
Warming up --------------------------------------
String#scan 135.724k i/100ms
String#match 117.397k i/100ms
String#=~ 151.637k i/100ms
Calculating -------------------------------------
String#scan 1.351M (± 0.8%) i/s - 6.786M in 5.021955s
String#match 1.169M (± 1.3%) i/s - 5.870M in 5.020429s
String#=~ 1.520M (± 0.9%) i/s - 7.733M in 5.087427s
Comparison:
String#=~: 1520250.9 i/s
String#scan: 1351399.0 i/s - 1.12x (± 0.00) slower
String#match: 1169384.1 i/s - 1.30x (± 0.00) slower
```
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2021-09-26 04:12:53 +09:00 |
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