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nolan/flatten_vs_manual.rb

Last active December 12, 2015 06:48
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Benchmark flatten vs manual array creation
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flatten_vs_manual.rb
require "benchmark"
n = 50000
a = ('A'..'Z').to_a
a = a.zip(a) # [["A", "A"], ["B", "B"], ["C", "C"]...]
Benchmark.bm(7) do |x|
x.report("manual:") { n.times do; a.map {|b| ['X', b[0], b[1]] }; end }
x.report("flatten:") { n.times do; a.map {|b| ['X', b].flatten }; end }
end
@bradland
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bradland commented Feb 7, 2013

Under: ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin12.0.0]

              user     system      total        real
manual:   0.410000   0.010000   0.420000 (  0.475863)
flatten:  1.850000   0.020000   1.870000 (  1.900730)

@bradland
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bradland commented Feb 7, 2013

Under: ruby 1.9.3p327 (2012-11-10) [x86_64-darwin12.2.0]

              user     system      total        real
manual:   0.980000   0.020000   1.000000 (  1.112109)
flatten:  3.860000   0.050000   3.910000 (  4.010452)

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