Ruby String Concat Benchmark Fun

string_concat_benchmark.rb

require 'benchmark'

iterations = 100000

api_base = 'https://api.example.com'
api_version = 'v1'
rest_url = 'resource'

puts 'Ruby String Concat Benchmark Fun'

puts '===================================================='

5.times do
  Benchmark.bm(10) do |benchmark|
  
    benchmark.report('        add:   +') do
      iterations.times do
        url = api_base + '/' + api_version + '/' + rest_url
      end
    end

    benchmark.report('     append:  <<') do
      iterations.times do
        url = ''
        url << api_base << '/' << api_version << '/' << rest_url
      end
    end

    benchmark.report('interpolate: #{}') do
      iterations.times do
        url = "#{api_base}/#{api_version}/#{rest_url}"
      end
    end

  end
end

puts '===================================================='

=begin
Ruby String Concat Benchmark Fun
====================================================
                 user     system      total        real
        add:   +  0.100000   0.000000   0.100000 (  0.102474)
     append:  <<  0.070000   0.010000   0.080000 (  0.067541)
interpolate: #{}  0.050000   0.000000   0.050000 (  0.055584)
                 user     system      total        real
        add:   +  0.100000   0.000000   0.100000 (  0.096606)
     append:  <<  0.060000   0.000000   0.060000 (  0.061436)
interpolate: #{}  0.050000   0.000000   0.050000 (  0.052648)
                 user     system      total        real
        add:   +  0.110000   0.000000   0.110000 (  0.109778)
     append:  <<  0.060000   0.000000   0.060000 (  0.062491)
interpolate: #{}  0.060000   0.000000   0.060000 (  0.057211)
                 user     system      total        real
        add:   +  0.100000   0.000000   0.100000 (  0.101370)
     append:  <<  0.060000   0.000000   0.060000 (  0.064502)
interpolate: #{}  0.060000   0.000000   0.060000 (  0.059637)
                 user     system      total        real
        add:   +  0.110000   0.010000   0.120000 (  0.112746)
     append:  <<  0.060000   0.000000   0.060000 (  0.064556)
interpolate: #{}  0.060000   0.000000   0.060000 (  0.055275)
====================================================
=end

FYI, you might want to look at Benchmark.bmbm for the rehearsal phase. Or maybe use benchmark-ips.