require 'benchmark'
require 'active_support/all'

arr = Array.new(1000_0000) { rand(1...20) }

Benchmark.bm do |benchmark|
  benchmark.report "arr.sum { |n| n.odd? ? n : 0 }" do
    arr.sum { |n| n.odd? ? n : 0 }
  end
  benchmark.report "arr.select(&:odd?).sum" do
    arr.select(&:odd?).sum
  end
  benchmark.report "arr.select(&:odd?).sum" do
    arr.select{|a| a.odd?}.sum
  end
end