each君 vs enumerable君

each_vs_compact_map_uniq_bench.rb

require 'benchmark'

N = 5
TRY = 1_000_000

campaign = Struct.new("Campagin", :id)
campaings = []
N.times { |i| campaings << campaign.new(i+1) }

def each(ary)
  id = nil
  ary.each do |c|
    next if c.nil?
    next id = c.id if id.nil?
    if id != c.id
      return false
    end
  end
  true
end

def compact_map_uniq(ary)
  ary.compact.map(&:id).uniq.size <= 1
end

Benchmark::bmbm do |b|
  b.report("each") do
    TRY.times do
      each(campaings)
    end
  end

  b.report("compact_map_uniq") do
    TRY.times do
      compact_map_uniq(campaings)
    end
  end
end

gistfile1.txt

Rehearsal ----------------------------------------------------
each               0.480000   0.000000   0.480000 (  0.477554)
compact_map_uniq   1.900000   0.010000   1.910000 (  1.911051)
------------------------------------------- total: 2.390000sec

                       user     system      total        real
each               0.490000   0.000000   0.490000 (  0.495289)
compact_map_uniq   1.970000   0.000000   1.970000 (  1.980382)