trim_quotes.rb

01_trim_quotes_benchmark.rb

require 'benchmark/ips'
require 'securerandom'

def trim_quotes_wiktor(str)
  str.gsub(/\A"(.*)"\Z/m, '\1')
end

def trim_quotes_sawa(str)
  str.dup.tap do |s|
    s[0] = s[-1] = "" if s[0] == '"' and s[-1] == '"'
  end
end

# Generate a random string 4-52 characters in length with a 70%
# chance of having a leading `"` and a 70% chance of having a
# trailing `"`.
RAND_SIZE = 4..50

def rand_str
  size = rand(RAND_SIZE) / 2
  str = SecureRandom.hex(size)
  "#{?" if rand > 0.3}#{str}#{?" if rand > 0.3}"
end

data = Array.new(5000) { rand_str }

Benchmark.ips do |x|
  x.report("wiktor") { data.each {|str| trim_quotes_wiktor(str) } }
  x.report("sawa") { data.each {|str| trim_quotes_sawa(str) } }
  x.compare!
end

02_result.txt

Calculating -------------------------------------
              wiktor     8.000  i/100ms
                sawa    23.000  i/100ms
-------------------------------------------------
              wiktor     69.514  (± 7.2%) i/s -    352.000
                sawa    214.339  (± 9.3%) i/s -      1.081k

Comparison:
                sawa:      214.3 i/s
              wiktor:       69.5 i/s - 3.08x slower