Created
June 22, 2011 01:36
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require 'benchmark' | |
array = [*(1..9)] * 1_000_000 | |
Benchmark.bmbm do |bm| | |
bm.report "with if" do | |
array.each_with_index do |element, i| | |
next if i == 1 | |
element - 1 | |
end | |
end | |
bm.report "without if" do | |
array.each do |element| | |
element - 1 | |
end | |
end | |
bm.report "with reject" do | |
array.each_with_index.reject {|el,i| i == 1}.each do |el, i| | |
el- 1 | |
end | |
end | |
bm.report "with first and drop" do | |
n = 1 | |
(array.first(n) + array.drop(n + 1)).each do |el| | |
el- 1 | |
end | |
end | |
bm.report "with ranges" do | |
n = 1 | |
((0...n).to_a + ((n+1)...array.size).to_a).map{|i| array[i]}.each do |el| | |
el - 1 | |
end | |
end | |
end |
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→ ruby -v bench.rb | |
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.6.0] | |
Rehearsal ------------------------------------------------------- | |
with if 1.830000 0.010000 1.840000 ( 1.847044) | |
without if 1.230000 0.000000 1.230000 ( 1.244233) | |
with reject 5.730000 1.720000 7.450000 ( 11.672952) | |
with first and drop 1.290000 0.060000 1.350000 ( 1.694164) | |
with ranges 3.880000 0.390000 4.270000 ( 4.543618) | |
--------------------------------------------- total: 16.140000sec | |
user system total real | |
with if 1.830000 0.000000 1.830000 ( 1.832242) | |
without if 1.230000 0.000000 1.230000 ( 1.239936) | |
with reject 5.040000 0.340000 5.380000 ( 5.428142) | |
with first and drop 1.270000 0.010000 1.280000 ( 1.292207) | |
with ranges 3.580000 0.190000 3.770000 ( 3.802674) |
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