map vs map to proc benchmark

gistfile1.rb

require 'benchmark'

def map
  100000.times do
    [10, 20, 30, 40, 50, 60, 70, 80, 90, 100].map do |int|
      int.to_s
    end
  end
end

def map_to_proc
  100000.times do
    [10, 20, 30, 40, 50, 60, 70, 80, 90, 100].map(&:to_s)
  end
end

threads = []

5.times do
  threads << Thread.new do
    puts "map: #{Benchmark.measure { map }}"
  end
end

5.times do
  threads << Thread.new do
    puts "map_to_proc: #{Benchmark.measure { map_to_proc }}"
  end
end

threads.each { |thr| thr.join }

# results
# map:   2.310000   0.000000   2.310000 (  2.309747)
# map:   3.000000   0.010000   3.010000 (  3.008737)
# map:   2.610000   0.010000   2.620000 (  2.611520)
# map_to_proc:   2.390000   0.010000   2.400000 (  2.389130)
# map_to_proc:   3.180000   0.010000   3.190000 (  3.184652)
# map_to_proc:   2.790000   0.010000   2.800000 (  2.791936)
# map_to_proc:   2.780000   0.010000   2.790000 (  2.787186)
# map_to_proc:   2.780000   0.010000   2.790000 (  2.779340)
# map:   3.400000   0.010000   3.410000 (  3.407253)
# map:   3.380000   0.010000   3.390000 (  3.382457)