Ruby 2.4 的一些新特性已翻译 100%-白红宇

Ruby 2.4 的一些新特性已翻译 100%

阅读量：6589 次

发布时间：2019-06-24

本文共 1334 字，大约阅读时间需要 4 分钟。

使用了 Regexp#match? 的更快的正则表达式

require 'benchmark/ips'

Benchmark.ips do |bench|

EMPTY_STRING = ''

WHITESPACE = " \n\t\n "

CONTAINS_TEXT = ' hi '

PATTERN = /\A[[:space:]]*\z/

bench.report('Regexp#match?') do

PATTERN.match?(EMPTY_STRING)

PATTERN.match?(WHITESPACE)

PATTERN.match?(CONTAINS_TEXT)

end

bench.report('Regexp#match') do

PATTERN.match(EMPTY_STRING)

PATTERN.match(WHITESPACE)

PATTERN.match(CONTAINS_TEXT)

end

bench.report('Regexp#=~') do

PATTERN =~ EMPTY_STRING

PATTERN =~ WHITESPACE

PATTERN =~ CONTAINS_TEXT

end

bench.report('Regexp#===') do

PATTERN === EMPTY_STRING

PATTERN === WHITESPACE

PATTERN === CONTAINS_TEXT

end

bench.compare!

end

Warming up --------------------------------------
Regexp#match? 160.255k i/100ms
Regexp#match 44.904k i/100ms
Regexp#=~ 71.184k i/100ms
Regexp#=== 71.839k i/100ms
Calculating -------------------------------------
Regexp#match? 2.630M (± 4.0%) i/s - 13.141M in 5.004929s
Regexp#match 539.361k (± 3.9%) i/s - 2.694M in 5.002868s
Regexp#=~ 859.713k (± 4.2%) i/s - 4.342M in 5.060080s
Regexp#=== 872.217k (± 3.5%) i/s - 4.382M in 5.030612s

Comparison:
Regexp#match?: 2630002.5 i/s
Regexp#===: 872217.5 i/s - 3.02x slower
Regexp#=~: 859713.0 i/s - 3.06x slower
Regexp#match: 539361.3 i/s - 4.88x slower
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