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@holysugar
Last active October 10, 2017 09:33
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today's bench
require 'benchmark'
require 'active_support/all'
n = ARGV[0]&.to_i || 50000
m = ARGV[1]&.to_i || 20
arr = Array.new(m){|i| [i, [:a, :b, :c, :d].sample] }.shuffle.to_h
Benchmark.bmbm do |b|
b.report("1:") { n.times{ arr.select{|_,v| v == :a }.max&.first }}
b.report("2:") { n.times{ arr.each_with_object([]){|(k,v),o| o << k if v == :a }.max }}
b.report("3:") { n.times{ a = 0; arr.each{|k,v| a = k if v == :a && a < k }; a == 0 ? nil : a }}
b.report("4:") { n.times{ arr.sort.reverse_each.find{|k,v| v == :a }&.first }}
b.report("5:") { n.times{ arr.sort_by{|k,v| -k }.find{|k,v| v == :a }&.first }}
end
__END__
Rehearsal --------------------------------------
1: 0.190000 0.000000 0.190000 ( 0.191267)
2: 0.180000 0.010000 0.190000 ( 0.185720)
3: 0.080000 0.000000 0.080000 ( 0.085030)
4: 0.970000 0.000000 0.970000 ( 0.988984)
5: 0.430000 0.010000 0.440000 ( 0.439052)
----------------------------- total: 1.870000sec
user system total real
1: 0.180000 0.000000 0.180000 ( 0.189173)
2: 0.180000 0.000000 0.180000 ( 0.185014)
3: 0.090000 0.000000 0.090000 ( 0.091285)
4: 0.990000 0.010000 1.000000 ( 1.003560)
5: 0.420000 0.000000 0.420000 ( 0.426253)
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