gistfile1.rb

Benchmark.bmbm do |x|
  x.report("each") do
    count = 0
    
    self.posts.each do |p|
      count += 1 if p.live?
    end
        
    count
  end

  x.report("select") { posts.select(&:live?).count }
end

================================================================
Rehearsal ------------------------------------------
each     0.010000   0.000000   0.010000 (  0.007944)
select   0.000000   0.000000   0.000000 (  0.000321)
--------------------------------- total: 0.010000sec

             user     system      total        real
each     0.010000   0.000000   0.010000 (  0.015396)
select   0.000000   0.000000   0.000000 (  0.000409)
================================================================