temp.rb

require "rubygems"
require "rbench"

RBench.run(1_000_000) do
  column :time

  report "block" do
    times {[1,2,3,4,5].map {|v| v.to_s}}
  end

  report "symbol2proc" do
    times {[1,2,3,4,5].map(&:to_s)}
  end
end

# Results on 1.9.2:
#                        TIME |
# -----------------------------
# block                 0.234 |
# symbol2proc           0.195 |
#
# Results on 1.8.7
#
                       # TIME |
# -----------------------------
# block                 0.240 |
# symbol2proc           0.238 |