gistfile1.rb

require 'benchmark'                                                             
                                                                                
STRING = 'abc'                                                                  
ITERATIONS = 500000                                                             
                                                                                
Benchmark.bm do |bench|                                                         
  for n in [2,3,4]                                                              
    n_strings = Array.new(n, STRING)                                            
                                                                                
    bench.report("add #{n}") do                                                 
      ITERATIONS.times do                                                       
        n_strings.reduce(:+)                                                    
      end                                                                       
    end                                                                         
                                                                                
    bench.report("+=  #{n}") do                                                 
      ITERATIONS.times do                                                       
        tmp = n_strings[0]                                                      
        n_strings.drop(1).each{|str| tmp += str}                                
      end                                                                       
    end                                                                         
                                                                                
    puts "\n"                                                                   
  end                                                                           
end