Contents

require 'benchmark'

class Integer
  def fact1
    return 1 if zero?
    f = 1
    2.upto(self) { |n| f *= n }
    f
  end

  def fact2
    (2..self).inject(1){|fact,i| fact*i}
  end
end

Benchmark.bm do |b|
  n = 1000

  b.report("current") do
    n.times do
      (0..20).each {|i| i.fact1}
    end
  end

  b.report("inject") do
    n.times do
      (0..20).each {|i| i.fact2}
    end
  end
end

Version data entries

20 entries across 20 versions & 1 rubygems

Version	Path
facets-2.9.2	work/bench/integer/bench_factorial.rb
facets-2.0.0	demo/bench/bench_factorial.rb
facets-2.0.1	demo/bench/integer/bench_factorial.rb
facets-2.0.2	demo/bench/integer/bench_factorial.rb
facets-2.1.0	demo/bench/integer/bench_factorial.rb
facets-2.0.3	demo/bench/integer/bench_factorial.rb
facets-2.0.4	demo/bench/integer/bench_factorial.rb
facets-2.0.5	demo/bench/integer/bench_factorial.rb
facets-2.1.1	demo/bench/integer/bench_factorial.rb
facets-2.1.2	demo/bench/integer/bench_factorial.rb
facets-2.1.3	demo/bench/integer/bench_factorial.rb
facets-2.3.0	demo/bench/integer/bench_factorial.rb
facets-2.2.0	demo/bench/integer/bench_factorial.rb
facets-2.4.0	demo/bench/integer/bench_factorial.rb
facets-2.2.1	demo/bench/integer/bench_factorial.rb
facets-2.4.1	demo/bench/integer/bench_factorial.rb
facets-2.4.4	demo/bench/integer/bench_factorial.rb
facets-2.4.3	demo/bench/integer/bench_factorial.rb
facets-2.4.2	demo/bench/integer/bench_factorial.rb
facets-2.4.5	demo/bench/integer/bench_factorial.rb