better-benchmark.rb

require 'better-benchmark'

@data = (1..100).to_a

result = Benchmark.compare_realtime(
  :iterations => 30,
  :inner_iterations => 500_000,
  :warmup_iterations => 1,
  :verbose => true
) { |iteration|
  @data.shuffle!
}.with { |iteration|
  @data.shuffle
}

Benchmark.report_on result