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| require 'benchmark' | |
| hsh = {} | |
| 1000.times {|i| hsh[i.to_s] = i.succ.to_s} | |
| Benchmark.bm do |x| | |
| x.report("Hash[]") {1000.times{Hash[hsh.values.zip(hsh.keys)]}} | |
| x.report("invert") {1000.times{hsh.invert}} | |
| x.report("each_with_object") {1000.times{hsh.each_with_object({}){|(k,v),h| h[v] = k}}} | |
| end |
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| user system total real | |
| Hash[] 0.990000 0.050000 1.040000 ( 1.160492) | |
| invert 0.810000 0.010000 0.820000 ( 0.882803) | |
| each_with_object 1.180000 0.010000 1.190000 ( 1.354336) |
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