# Copied from my benchmark_hell repo: github.com/sgonyea/benchmark_hell require 'benchmark' iters = 1000000 hash = { 'some_key' => 'some_val', 'nil_key' => nil } puts 'Hash#has_key vs. Hash#[]' Benchmark.bmbm do |x| x.report('Hash#has_key') do iters.times.each do hash.has_key? 'some_key' end end x.report('Hash#has_key (if statement)') do iters.times.each do if hash.has_key?('other_key') "hooray!" end end end x.report('Hash#has_key (non-existant)') do iters.times.each do hash.has_key? 'other_key' end end x.report('Hash#[]') do iters.times.each do hash['some_key'] end end x.report('Hash#[] (if statement)') do iters.times.each do if hash['some_key'] "hooray!" end end end x.report('Hash#[] (non-existant)') do iters.times.each do hash['other_key'] end end x.report('Hash#has_key (if statement) explicit nil check') do iters.times.each do if hash.has_key?('nil_key') && !hash['nil_key'].nil? "hooray!" end end end x.report('Hash#has_key (if statement) implicit nil check') do iters.times.each do if hash.has_key?('nil_key') && hash['nil_key'] "hooray!" end end end x.report('Hash#[] (if statement with nil)') do iters.times.each do if hash['nil_key'] "hooray!" end end end end =begin $ rvm exec bash -c 'echo $RUBY_VERSION && ruby has_key-vs-hash\[key\].rb' jruby-1.5.6 Hash#has_key vs. Hash#[] Rehearsal --------------------------------------------------------------- Hash#has_key 0.410000 0.000000 0.410000 ( 0.341000) Hash#has_key (if statement) 0.145000 0.000000 0.145000 ( 0.145000) Hash#has_key (non-existant) 0.116000 0.000000 0.116000 ( 0.116000) Hash#[] 0.189000 0.000000 0.189000 ( 0.189000) Hash#[] (if statement) 0.176000 0.000000 0.176000 ( 0.176000) Hash#[] (non-existant) 0.302000 0.000000 0.302000 ( 0.302000) ------------------------------------------------------ total: 1.338000sec user system total real Hash#has_key 0.128000 0.000000 0.128000 ( 0.128000) Hash#has_key (if statement) 0.128000 0.000000 0.128000 ( 0.128000) Hash#has_key (non-existant) 0.153000 0.000000 0.153000 ( 0.153000) Hash#[] 0.206000 0.000000 0.206000 ( 0.206000) Hash#[] (if statement) 0.182000 0.000000 0.182000 ( 0.182000) Hash#[] (non-existant) 0.252000 0.000000 0.252000 ( 0.252000) macruby-0.7.1 Hash#has_key vs. Hash#[] Rehearsal --------------------------------------------------------------- Hash#has_key 2.530000 0.050000 2.580000 ( 1.917643) Hash#has_key (if statement) 2.590000 0.050000 2.640000 ( 1.935221) Hash#has_key (non-existant) 2.580000 0.050000 2.630000 ( 1.964230) Hash#[] 2.240000 0.040000 2.280000 ( 1.640999) Hash#[] (if statement) 3.620000 0.070000 3.690000 ( 2.530248) Hash#[] (non-existant) 2.060000 0.040000 2.100000 ( 1.473487) ----------------------------------------------------- total: 15.920000sec user system total real Hash#has_key 2.230000 0.030000 2.260000 ( 1.661843) Hash#has_key (if statement) 2.180000 0.040000 2.220000 ( 1.605644) Hash#has_key (non-existant) 2.160000 0.040000 2.200000 ( 1.582561) Hash#[] 2.160000 0.030000 2.190000 ( 1.581448) Hash#[] (if statement) 3.440000 0.070000 3.510000 ( 2.393421) Hash#[] (non-existant) 2.330000 0.040000 2.370000 ( 1.699338) rbx-head Hash#has_key vs. Hash#[] Rehearsal --------------------------------------------------------------- Hash#has_key 0.660584 0.004932 0.665516 ( 0.508601) Hash#has_key (if statement) 0.261708 0.000532 0.262240 ( 0.263021) Hash#has_key (non-existant) 0.265908 0.000827 0.266735 ( 0.259509) Hash#[] 0.396607 0.001189 0.397796 ( 0.372997) Hash#[] (if statement) 0.553003 0.001589 0.554592 ( 0.543859) Hash#[] (non-existant) 0.323748 0.000884 0.324632 ( 0.319055) ------------------------------------------------------ total: 2.471511sec user system total real Hash#has_key 0.332239 0.000819 0.333058 ( 0.333809) Hash#has_key (if statement) 0.284344 0.000521 0.284865 ( 0.285330) Hash#has_key (non-existant) 0.339695 0.001301 0.340996 ( 0.324259) Hash#[] 0.298555 0.000368 0.298923 ( 0.299557) Hash#[] (if statement) 0.392755 0.000773 0.393528 ( 0.395473) Hash#[] (non-existant) 0.277721 0.000464 0.278185 ( 0.278540) ruby-1.8.7-p330 Hash#has_key vs. Hash#[] Rehearsal --------------------------------------------------------------- Hash#has_key 0.450000 0.000000 0.450000 ( 0.450143) Hash#has_key (if statement) 0.440000 0.000000 0.440000 ( 0.448278) Hash#has_key (non-existant) 0.420000 0.000000 0.420000 ( 0.416959) Hash#[] 0.450000 0.000000 0.450000 ( 0.450727) Hash#[] (if statement) 0.550000 0.000000 0.550000 ( 0.555043) Hash#[] (non-existant) 0.530000 0.000000 0.530000 ( 0.527189) ------------------------------------------------------ total: 2.840000sec user system total real Hash#has_key 0.440000 0.000000 0.440000 ( 0.447746) Hash#has_key (if statement) 0.450000 0.000000 0.450000 ( 0.450331) Hash#has_key (non-existant) 0.420000 0.000000 0.420000 ( 0.419157) Hash#[] 0.450000 0.000000 0.450000 ( 0.454438) Hash#[] (if statement) 0.570000 0.000000 0.570000 ( 0.563948) Hash#[] (non-existant) 0.520000 0.000000 0.520000 ( 0.527866) ruby-1.9.2-p136 Hash#has_key vs. Hash#[] Rehearsal --------------------------------------------------------------- Hash#has_key 0.690000 0.000000 0.690000 ( 0.691657) Hash#has_key (if statement) 0.630000 0.000000 0.630000 ( 0.638418) Hash#has_key (non-existant) 0.640000 0.000000 0.640000 ( 0.637510) Hash#[] 0.580000 0.000000 0.580000 ( 0.584500) Hash#[] (if statement) 0.840000 0.010000 0.850000 ( 0.837541) Hash#[] (non-existant) 0.810000 0.000000 0.810000 ( 0.811598) ------------------------------------------------------ total: 4.200000sec user system total real Hash#has_key 0.690000 0.000000 0.690000 ( 0.694192) Hash#has_key (if statement) 0.640000 0.000000 0.640000 ( 0.641729) Hash#has_key (non-existant) 0.630000 0.000000 0.630000 ( 0.634470) Hash#[] 0.580000 0.000000 0.580000 ( 0.587844) Hash#[] (if statement) 0.830000 0.000000 0.830000 ( 0.832323) Hash#[] (non-existant) 0.790000 0.010000 0.800000 ( 0.791689) =end