blockbench.rb

require 'benchmark'

class Foo
  def a; true; end
end

n = 1_000_000
Benchmark.bm(30) do | b |
  instance = Foo.new
  b.report( "a simple method call" ) do
    n.times { instance.a }
  end

  instance = Foo.new
  block = lambda { true }
  b.report( "instance_eval with block" ) do
    n.times { instance.instance_eval( &block ) }
  end

  instance = Foo.new
  string = "true"
  b.report( "instance_eval with string" ) do
    n.times { instance.instance_eval( string ) }
  end

  method = Foo.instance_method( :a )
  instance = Foo.new
  bound_method = method.bind( instance )
  b.report( "bound method" ) do 
    n.times { bound_method.call }
  end
end