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| require 'benchmark' | |
| N = 100_000 | |
| a = [] | |
| 100.times { a << (rand(10) > 5 ? true : false) } | |
| Benchmark.bm(35) { |x| | |
| x.report("String#to_i(base)") { | |
| N.times { a.map {|v| v ? "1" : "0" }.join().to_i(2) } | |
| } | |
| x.report("String#to_i(base integers)") { | |
| N.times { a.map {|v| v ? 1 : 0 }.join().to_i(2) } | |
| } | |
| x.report("Bit shift") { | |
| N.times { a.inject(0) {|m, v| m <<= 1; m | (v ? 1 : 0) } } | |
| } | |
| # Precompute | |
| a.map! {|v| v ? "1" : "0" } | |
| x.report("String#to_i(premapped)") { | |
| N.times { a.join().to_i(2) } | |
| } | |
| a.map! {|v| v.to_i } | |
| x.report("Bit shift(premapped)") { | |
| N.times { a.inject(0) {|m, v| m <<= 1; m | v } } | |
| } | |
| } | |
| =begin | |
| gaffneyc@magrathea ~/dev/git/47994 (master) $ ruby gistfile1.rb | |
| user system total real | |
| String#to_i(base) 4.950000 0.020000 4.970000 ( 5.004080) | |
| String#to_i(base integers) 10.400000 0.050000 10.450000 ( 10.557950) | |
| Bit shift 20.770000 0.090000 20.860000 ( 21.046028) | |
| String#to_i(premapped) 1.040000 0.010000 1.050000 ( 1.064023) | |
| Bit shift(premapped) 20.140000 0.090000 20.230000 ( 20.413547) | |
| =end |
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