snippet.rb

require 'rubygems'
require 'rbench'
require 'activesupport'

strings = %w(jon stefan carl sofie)
numbers = [1, 3, 5, 7]

RBench.run(10_000) do
  
  column :one
  column :two

  report "map with block" do
    one { strings.map {|s| s.length } }
    two { numbers.map {|i| i.to_s } }
  end
  
  report "map with symbol to proc" do
    one { strings.map(&:length) }
    two { numbers.map(&:to_s) }
  end
  
end