Le point sur l'interpolation

gistfile1.rb

require 'benchmark'
n = 1000000
m = n.to_s

Benchmark.bm do |x|
  x.report("assign single   ") { n.times do; c = 'a string'; end}
  x.report("assign double   ") { n.times do; c = "a string"; end}
  x.report("assign interp   ") { n.times do; c = "a #{n} string"; end}
  x.report("concat +  single") { n.times do; 'a ' + n.to_s + ' string b ' + n.to_s + ' string'; end}
  x.report("concat +  double") { n.times do; "a " + n.to_s + " string b " + n.to_s + " string"; end}
  x.report("concat << single") { n.times do; 'a ' << n.to_s << ' string b ' << n.to_s << ' string'; end}
  x.report("concat << double") { n.times do; "a " << n.to_s << " string b " << n.to_s << " string"; end}
  x.report("concat interp   ") { n.times do; "a #{n} string b #{n} string"; end}
  x.report("single +  optim ") { n.times do; 'a ' + m + ' string b ' + m + ' string'; end}
  x.report("double +  optim ") { n.times do; "a " + m + " string b " + m + " string"; end}
  x.report("single << optim ") { n.times do; 'a ' << m << ' string b ' << m << ' string'; end}
  x.report("double << optim ") { n.times do; "a " << m << " string b " << m << " string"; end}
  x.report("interp optim    ") { n.times do; "a #{m} string b #{m} string"; end}
end


#============= Results
# [ruby-1.9.3-p125@]
$ ruby quotes_and_string_love.rb

                    user     system      total        real
assign single     0.110000   0.000000   0.110000 (  0.116910)
assign double     0.120000   0.000000   0.120000 (  0.117053)
assign interp     0.480000   0.000000   0.480000 (  0.478378)
concat +  single  1.350000   0.000000   1.350000 (  1.352242)
concat +  double  1.350000   0.000000   1.350000 (  1.350185)
concat << single  1.110000   0.000000   1.110000 (  1.109680)
concat << double  1.110000   0.000000   1.110000 (  1.108533)
concat interp     1.020000   0.000000   1.020000 (  1.022490)
single +  optim   1.010000   0.000000   1.010000 (  1.010864)
double +  optim   1.010000   0.000000   1.010000 (  1.009166)
single << optim   0.740000   0.000000   0.740000 (  0.734263)
double << optim   0.730000   0.000000   0.730000 (  0.731785)
interp optim      0.650000   0.000000   0.650000 (  0.647658)