array testing

gistfile1.rb

require 'benchmark'

arr = [
  
]

Benchmark.bm do |x|
  x.report 'class check' do
    100.times.each do |i|
      100_000.times.each do |j|
        if arr[i].is_a? Array
          arr[i] << j
        else
          arr[i] = [j]
        end
      end
    end
  end

  x.report '||=' do
    100.times.each do |i|
      100_000.times.each do |j|
        arr[i] ||= []
        arr[i] << j
      end
    end
  end
end



#                  user     system      total        real
#  class check  2.020000   0.040000   2.060000 (  2.058548)
# ||=           2.000000   0.070000   2.070000 (  2.177428)