Pre define method for array sort

pre-define-method-array.rb

require 'benchmark'

Benchmark.bm do |x|
  names = ["matz", "rossum", "ryal", "ritchie", "brendan"]
  n =  50000

  x.report "method missing" do
    class Array
      def method_missing name, *argv
        super unless name =~ /^sort_by_(\w+)_(asc|desc)$/
        condition = ($2 == "asc" ? "{ |a, b| a.%s <=> b.%s }" : "{ |a, b| b.%s <=> a.%s }") % [$1, $1]
        instance_eval "sort #{condition}"
      end
    end

    n.times { names.sort_by_length_asc }
  end

  x.report "predefine method" do
    class Array
      def method_missing name, *argv
        super unless name =~ /^sort_by_(\w+)_(asc|desc)$/
        condition = ($2 == "asc" ? "{ |a, b| a.%s <=> b.%s }" : "{ |a, b| b.%s <=> a.%s }") % [$1, $1]

        Array.class_eval <<-METHOD
          def #{name}
            sort #{condition}
          end
        METHOD

        instance_eval "#{name}"
      end
    end

    n.times { names.sort_by_length_asc }
  end

end

require 'benchmark'
require 'ruby-prof' 

names = ["matz", "rossum", "ryal", "ritchie", "brendan"]
n = 5000 
class Array
  def method_missing name, *argv
    super unless name =~ /^sort_by_(¥w+)_(asc|desc)$/
    condition = ($2 == "asc" ? "{ |a, b| a.%s <=> b.%s }" : "{ |a, b| b.%s <=> a.%s }") % [$1, $1]

    Array.class_eval <<-METHOD
      def #{name}
        sort #{condition}
      end
    METHOD

    instance_eval "#{name}"
  end
end

RubyProf.start
n.times { names.sort_by_length_asc }
result = RubyProf.stop
printer = RubyProf::FlatPrinter.new(result)
printer.print(STDOUT)

Array.send :remove_method, :sort_by_length_asc

class Array
  def method_missing name, *argv
    super unless name =~ /^sort_by_(¥w+)_(asc|desc)$/
    condition = ($2 == "asc" ? "{ |a, b| a.%s <=> b.%s }" : "{ |a, b| b.%s <=> a.%s }") % [$1, $1]
    instance_eval "sort #{condition}"
  end
end

RubyProf.start
n.times { names.sort_by_length_asc }
result = RubyProf.stop
printer = RubyProf::FlatPrinter.new(result)
printer.print(STDOUT)