amatsuda

S = 'foo'

class A
  def a() S; end
end

class B < BasicObject
  # needs to be ::S
  def b() ::S; end
end

amatsuda

if false
  a = 1
end

p a
#=> nil


p b
#=> undefined local variable or method `b' for main:Object (NameError)

amatsuda

Kernel.class_eval do
  #FIXME this is terrible
  def static(meth)
    define_singleton_method(meth) do |*args, &b|
      new.send meth, *args, &b
    end
    meth
  end

  def abstract(meth)

amatsuda

# put this piece of code in your spec/spec_helper.rb or spec/support/any_rb_file.rb
# then run `rake spec`
module CleanerBench
  def clean(*)
    now = Time.now
    super
    @time_spent ||= 0
    @time_spent += Time.now - now
  end

amatsuda

+----------------------+--------+--------+---------+---------+-----+-------+
| Name                 |  Lines |   LOC  | Classes | Methods | M/C | LOC/M |
+----------------------+--------+--------+---------+---------+-----+-------+
| Controllers          |  48726 |  39215 |     522 |    3970 |   7 |     7 |
| Helpers              |  14795 |  12125 |      15 |    1399 |  93 |     6 |
| Models               |  96678 |  76140 |    1747 |    8548 |   4 |     6 |
| Mailers              |   2208 |   1766 |      44 |     206 |   4 |     6 |
| Workers              |    639 |    540 |      20 |      31 |   1 |    15 |
| Chanko units         |  11713 |   9644 |       6 |     247 |  41 |    37 |
| Libraries            |  50409 |  41650 |     592 |    3741 |   6 |     9 |

amatsuda

if false
  a = 2
  p a
else
  Proc.new do |a|
    p a
  end
end

amatsuda

% rails g model m `ruby -e "801.times {|i| print %(c#{i} )}"` && rake db:migrate
% rails r 'p M.new.methods.length'
#=> 10000

amatsuda

def b() binding; end
eval 'def translate() end', b
eval '1'
# => t.rb:3:in `eval': wrong number of arguments (given 1, expected 0) (ArgumentError)

amatsuda

require 'benchmark/ips'
require 'json'
require 'oj'
require 'multi_json'

Benchmark.ips do |x|
  hash = 100.times.inject(Hash.new) {|h, i| h["key#{i}"] = i; h}
  x.report('to_json') do
    hash.to_json
  end

amatsuda

# Question: which module would raise an error?

module I
  include
end

module P
  prepend
end