bm(label_width = 0, *labels) {|report| ...} in Ruby

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A simple interface to the benchmark method, bm is generates sequential reports with labels. The parameters have the same meaning as for benchmark.

    require 'benchmark'

    n = 50000
    Benchmark.bm(7) do |x|
      x.report("for:")   { for i in 1..n; a = "1"; end }
      x.report("times:") { n.times do   ; a = "1"; end }
      x.report("upto:")  { 1.upto(n) do ; a = "1"; end }
    end

Generates:

                    user     system      total        real
       for:     1.050000   0.000000   1.050000 (  0.503462)
       times:   1.533333   0.016667   1.550000 (  0.735473)
       upto:    1.500000   0.016667   1.516667 (  0.711239)

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