Array Intersection vs find / include?

intersection_vs_include?.rb

require 'benchmark'

num = 1000000
uss = []
up_to_num = (1..num).to_a
repeat = 100
num_class_subject_ids = 5
Benchmark.bm do |x|
  #full set intersection
  x.report { repeat.times do |num| ; (up_to_num & [num]).empty? ; end }
  #include / find search? for
  sim_id_sets = (1..repeat).to_a.map { up_to_num.sample(num_class_subject_ids) }
  x.report do
    repeat.times do |num|
      sim_id_sets[num-1].each do |sid|
        up_to_num.include?(sid)
      end
    end
  end
end

# num_class_subject_ids = 2
#       user     system      total        real
#   1.340000   0.000000   1.340000 (  1.334621)
#   0.390000   0.000000   0.390000 (  0.392117)

# num_class_subject_ids = 5
#       user     system      total        real
#   1.070000   0.010000   1.080000 (  1.085872)
#   0.900000   0.000000   0.900000 (  0.903072)

#USING find instead of each
Benchmark.bm do |x|
  #full set intersection
  x.report { repeat.times do |num| ; (up_to_num & [num]).empty? ; end }
  #include / find search? for
  sim_id_sets = (1..repeat).to_a.map { up_to_num.sample(num_class_subject_ids) }
  x.report do
    repeat.times do |num|
      sim_id_sets[num-1].find do |sid|
        up_to_num.include?(sid)
      end
    end
  end
end

#num_class_subject_ids = 2
#       user     system      total        real
#   1.110000   0.000000   1.110000 (  1.108072)
#   0.170000   0.000000   0.170000 (  0.177406)

#num_class_subject_ids = 5
#       user     system      total        real
#   1.110000   0.000000   1.110000 (  1.111455)
#   0.160000   0.000000   0.160000 (  0.167238)