String .size vs .length

string_size_vs_length.rb

require 'benchmark'

string = 'dskjkd'
n = 500000
Benchmark.bm(40) do |x|
  x.report("string.size    "){ n.times { string.size } }
  x.report("string.length  "){ n.times { string.length } }
end


                                               user     system      total        real
string.size                                0.040000   0.000000   0.040000 (  0.039680)
string.length                              0.040000   0.000000   0.040000 (  0.038848)