array_add_benchmarks.rb

Code:
-----------------------------
# frozen_string_literal: true

# Install the necessary gems:
# gem install benchmark-ips
# gem install kalibera

require 'benchmark/ips'

# Enable and start GC before each job run. Disable GC afterwards.
#
# Inspired by https://www.omniref.com/ruby/2.2.1/symbols/Benchmark/bm?#annotation=4095926&line=182
class GCSuite
  def warming(*)
    run_gc
  end

  def running(*)
    run_gc
  end

  def warmup_stats(*)
  end

  def add_report(*)
  end

  private

  def run_gc
    GC.enable
    GC.start
    GC.disable
  end
end

suite = GCSuite.new

Benchmark.ips do |x|
  x.config(:time => 10, :warmup => 5, :stats => :bootstrap, :confidence => 95)

  x.report('Array#unshift') do
    array = []
    100_000.times { |i| array.unshift(i) }
  end

  x.report('Array#shift') do
    array = []
    100_000.times { |i| array.shift(i) }
  end

  x.report('Array#insert') do
    array = []
    100_000.times { |i| array.insert(0, i) }
  end

  x.report('Array#<<') do
    array = []
    100_000.times { |i| array << i }
  end

  x.compare!
end