Ruby benchmark to compare <<, push, and concat

benchmark.rb

require 'benchmark'

iterations  = 100_000
array_one   = []
array_two   = []
array_three = []

Benchmark.bmbm do |bm|
  bm.report('<<') do
    iterations.times do
      array_one << [1,2,3,4]
    end

    array_one.flatten
  end
 
  bm.report('push') do
    iterations.times do
      array_two.push(*[1,2,3,4])
    end
  end

  bm.report('concat') do
    iterations.times do
      array_three.concat([1,2,3,4])
    end
  end
end

output

Rehearsal ------------------------------------------
<<       0.060000   0.000000   0.060000 (  0.066589)
push     0.040000   0.000000   0.040000 (  0.043640)
concat   0.020000   0.000000   0.020000 (  0.024190)
--------------------------------- total: 0.120000sec

             user     system      total        real
<<       0.090000   0.000000   0.090000 (  0.096140)
push     0.030000   0.000000   0.030000 (  0.025260)
concat   0.030000   0.000000   0.030000 (  0.023582)