map bencmark

Gemfile

source 'https://rubygems.org'
ruby '2.4'

gem 'benchmark-ips'

map_benchmark.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  x.report('map_block') { (1..100000).map { |i| i.to_s } }
  x.report('map_&')     { (1..100000).map(&:to_s) }

  x.compare!
end

=begin
  MRI 2.4

  Warming up --------------------------------------
             map_block     5.000  i/100ms
                 map_&     4.000  i/100ms
  Calculating -------------------------------------
             map_block     46.775  (± 4.3%) i/s -    235.000  in   5.036210s
                 map_&     64.124  (± 4.7%) i/s -    324.000  in   5.062029s

  Comparison:
                 map_&:       64.1 i/s
             map_block:       46.8 i/s - 1.37x  slower
=end