procs_are_slow.rb

require 'benchmark/ips'

Benchmark.ips do |b|
  n = '42'

  b.report('method call') { n.to_i }

  bound = n.method(:to_i)
  b.report('bound') { bound.call }

  unbound = String.instance_method(:to_i)
  b.report('unbound') { unbound.bind(n).call }

  b.compare!
end