instance_eval_benchmark.rb

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)

Thread ID: 2151954760
Total: 0.150838
Sort by: self_time

%self total self wait child calls name
56.69 0.121 0.086 0.000 0.035 5000 Array#sort
23.53 0.035 0.035 0.000 0.000 30000 Fixnum#<=>
11.40 0.138 0.017 0.000 0.121 5000 Array#sort_by_length_asc
8.25 0.151 0.012 0.000 0.138 1 Integer#times
0.04 0.151 0.000 0.000 0.151 1 Global#[No method]
0.03 0.000 0.000 0.000 0.000 1 Module#class_eval
0.02 0.000 0.000 0.000 0.000 1 Array#method_missing
0.02 0.000 0.000 0.000 0.000 1 String#%
0.01 0.000 0.000 0.000 0.000 1 BasicObject#instance_eval
0.01 0.000 0.000 0.000 0.000 1 Symbol#=~
0.00 0.000 0.000 0.000 0.000 2 Symbol#to_s
0.00 0.000 0.000 0.000 0.000 1 Module#method_added

• indicates recursively called methods
  Thread ID: 2151954760
  Total: 0.440300
  Sort by: self_time

  %self total self wait child calls name
  39.00 0.315 0.172 0.000 0.143 5000 BasicObject#instance_eval
  24.41 0.143 0.107 0.000 0.036 5000 Array#sort
  13.89 0.424 0.061 0.000 0.363 5000 Array#method_missing
  8.17 0.036 0.036 0.000 0.000 30000 Fixnum#<=>
  6.08 0.027 0.027 0.000 0.000 5000 Symbol#=~
  4.77 0.021 0.021 0.000 0.000 5000 String#%
  3.66 0.440 0.016 0.000 0.424 1 Integer#times
  0.01 0.440 0.000 0.000 0.440 1 Global#[No method]

• indicates recursively called methods