Benchmark string substitution with [] and gsub

benchmark_string_subst.rb

require 'benchmark'

TIMES = 100000
s = "carlos"

Benchmark.bm(10) do |x|
  x.report('[1...-1]') do
    TIMES.times do
      s.encode(s.encoding, :xml => :attr)[1...-1]
    end
  end

  x.report('gsub') do
    TIMES.times do
      s.encode(s.encoding, :xml => :attr).gsub(/^"|"$/,'')
    end
  end
end

require 'benchmark/ips'

Benchmark.ips do |x|
  x.report('[1...-1]') do
    s.encode(s.encoding, :xml => :attr)[1...-1]
  end

  x.report('gsub') do
    s.encode(s.encoding, :xml => :attr).gsub(/^"|"$/,'')
  end
end

=begin
# BM

                 user     system      total        real
[1...-1]     0.870000   0.000000   0.870000 (  0.951518)
gsub         1.480000   0.010000   1.490000 (  1.554291)

# IPS

Calculating -------------------------------------
            [1...-1]      7734 i/100ms
                gsub      4642 i/100ms
-------------------------------------------------
            [1...-1]   105354.7 (±2.1%) i/s -     533646 in   5.067577s
                gsub    63064.5 (±3.3%) i/s -     315656 in   5.010995s
=end