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## Managed Open Source blog code # http://blog.managedopensource.com # http://blog.managedopensource.com/2007/10/31/reversal-of-code-performance-optimizations-from-ruby-1-8-to-1-9 ## Ruby benchmark code require 'benchmark' hash = {} 1_000_000.times {|i| hash["name#{i}"] = "value#{i}" } def concat(value) "value is #{value}" end Benchmark.bm do |b| b.report("for ") { for key in hash.keys; concat(hash[key]); end; } b.report("each") { hash.keys.each {|key| concat(hash[key]) } } end Benchmark.bm do |b| b.report("<< ") do list = [] for key in hash.keys list << concat(hash[key]) end list end b.report("collect") do hash.keys.collect { |key| concat(hash[key]) } end end

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