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@holysugar
Created October 10, 2017 09:18
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today's bench
require 'benchmark'
require 'active_support/all'
n = 20000
m = 100
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 }}
end
# user system total real
# 1: 0.380000 0.000000 0.380000 ( 0.390095)
# 2: 0.310000 0.000000 0.310000 ( 0.323532)
# 3: 0.150000 0.000000 0.150000 ( 0.152381)
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