bench_dsd.rb

require 'benchmark_driver'
Benchmark.driver do |x|
  x.prelude <<~EOS
    # frozen_string_literal: true
    @world = 'world'
  EOS
  x.report 'array', %q{
    buf = []
    buf << @world.to_s
    buf << 'hello, '
    buf << @world.to_s
    buf.join
  }
  x.report 'hybrid', %q{
    buf = []
    buf << "#{@world}hello, #{@world}"
    buf.join
  }
end

result_dsd.log

Warming up --------------------------------------
               array     3.387M i/s -      3.518M times in 1.038515s (295.23ns/i)
              hybrid     3.702M i/s -      3.714M times in 1.003258s (270.12ns/i)
Calculating -------------------------------------
               array     3.599M i/s -     10.161M times in 2.823170s (277.83ns/i)
              hybrid     3.840M i/s -     11.106M times in 2.892639s (260.45ns/i)

Comparison:
              hybrid:   3839502.9 i/s
               array:   3599286.1 i/s - 1.07x  slower