SymbolProc basic bench

jruby 1.7.15 (1.9.3p392) 2014-09-03 82b5cc3 on Java HotSpot(TM) 64-Bit Server VM 1.8.0_11-b12 +jit [darwin-x86_64]

       user     system      total        real
block  6.950000   0.220000   7.170000 (  5.177000)
SymbolProc  5.500000   0.090000   5.590000 (  5.082000)

ruby 1.9.3p547 (2014-05-14) [x86_64-darwin13.3.0]

       user     system      total        real
block  6.510000   0.260000   6.770000 (  6.800353)
SymbolProc  6.060000   0.260000   6.320000 (  6.320873)

ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]

       user     system      total        real
block  6.440000   0.240000   6.680000 (  6.692680)
SymbolProc  6.140000   0.210000   6.350000 (  6.362771)

symbol_proc_vs_block_map.rb

require 'benchmark'

a = 1..50000
n = 500
Benchmark.bm do |x|
  x.report('block') do
    n.times do
      mapped = a.map { |i| i.to_s }
    end
  end

  x.report('SymbolProc') do
    n.times do
      mapped = a.map(&:to_s)
    end
  end
end