<<

require "benchmark"
n = 100000
Benchmark.bm do |x|
  x.report {
    a = "";
    for i in 1..n
      a += " ";
    end;
  }
  x.report {
    a = "";
    for i in 1..n
      a << " ";
    end;
  }
end;
#      user     system      total        real
#  8.402000   4.656000  13.058000 ( 13.910000)
#  0.080000   0.000000   0.080000 (  0.080000)