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require 'benchmark'
n = 1000
m = 50000
blank = [0] * m
Benchmark.bm(7) do |x|
x.report(".new with block:") { (0..n).collect { Array.new(m) { 0 } }}
x.report(" .new no block:") { (0..n).collect { Array.new(m, 0) }}
x.report(" [0] * x:") { (0..n).collect { [0] * m }}
x.report(" #dup:") { (0..n).collect { blank.dup }}
end
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$ ruby19 benchmark.rb
user system total real
.new with block: 10.180000 0.210000 10.390000 ( 10.459538)
.new no block: 3.690000 0.210000 3.900000 ( 3.915348)
[0] * x: 4.280000 0.210000 4.490000 ( 4.505334)
#dup: 0.000000 0.000000 0.000000 ( 0.000491)
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Know your constructors! What is #dup doing? I think it’s cheating.
