jeremy

$ irb
>> String.instance_method(:to_s).name
=> "to_s"

$ irb-1.9
>> String.instance_method(:to_s).name
=> :to_s

$ jirb
>> String.instance_method(:to_s).name

jeremy

#!/usr/bin/env ruby
# Run from toplevel rails checkout to profile a component's requires:
# $ ./profile_requires.rb active_support
GC.enable_stats
require 'rubygems'
require 'benchmark'

ENV['NO_RELOAD'] ||= '1'
ENV['RAILS_ENV'] ||= 'development'

jeremy

jeremy@foo rails (master) $ ruby -v
ruby 1.8.8dev (2009-03-19 revision 23009) [i386-darwin9.6.2]
jeremy@foo rails (master) $ ./profile_requires.rb active_support
   5854.24 KB     222568 obj    139.9 ms  active_support
    171.17 KB       2629 obj      4.1 ms   active_support/json
     23.53 KB        601 obj      0.5 ms    active_support/json/decoding
    136.72 KB       1766 obj      3.3 ms    active_support/json/encoding
      6.49 KB         45 obj      0.2 ms     active_support/json/encoders/true_class
      8.50 KB         88 obj      0.2 ms     active_support/json/encoders/time
      6.47 KB         49 obj      0.2 ms     active_support/json/encoders/symbol

jeremy

jeremy@foo rails (master) $ /usr/local/ruby/1.8.6-ree/bin/ruby -v
ruby 1.8.6 (2008-08-08 patchlevel 286) [i686-darwin9.5.0]
jeremy@foo rails (master) $ /usr/local/ruby/1.8.6-ree/bin/ruby profile_requires.rb active_support
   3757.52 KB     110258 obj     87.3 ms  active_support
    104.50 KB       2758 obj      3.3 ms   active_support/json
     16.50 KB        586 obj      0.4 ms    active_support/json/decoding
     78.95 KB       1901 obj      2.7 ms    active_support/json/encoding
      3.26 KB         54 obj      0.1 ms     active_support/json/encoders/true_class
      5.50 KB         97 obj      0.2 ms     active_support/json/encoders/time
      3.21 KB         58 obj      0.2 ms     active_support/json/encoders/symbol

jeremy

# encoding: utf-8
☂ = Class.new { def ☎; puts "⎆" end }
☂.new.☎

jeremy

module AfterTransaction
  def self.included(base)
    base.extend(ClassMethods)

    base.class_eval do
      class <<self
        alias_method_chain :transaction, :callbacks
      end
    end
  end

jeremy

# $/ is the ruby line separator, defaults to \n
$/ = '~'
File.open('some_file') do |file|  
  file.each_line do |line|
     # ...
  end
end

jeremy

# Users: JSON.encode(whatever)
#
# Implementors: override dump_json(options) returning a Hash, Array, etc
#           or: override encode_json(encoder) using the encoder API to return a JSON string

require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/object/instance_variables'

module ActiveSupport
  module JSON

jeremy

# Including a module included in a superclass is ignored
>> module Foo; end
=> nil
>> class Numeric; include Foo; end
=> Numeric
>> Float.ancestors
=> [Float, Precision, Numeric, Foo, Comparable, Object, Kernel]
>> class Float; include Foo; end
=> Float
>> Float.ancestors

jeremy

# Round expiry to encourage HTTP caching.
# 5-minute expiry at 6:03 would round up from 6:08 to 6:10.
module QuantizedExpiry
  def url_for(name, options = {})
    unless options[:expires]
      t = (options.delete(:expires_in) || 5.minutes).to_i
      options[:expires] = t * (2 + (Time.now.to_i / t))
    end
    super
  end