jasiek

diff --git a/app/models/sample.rb b/app/models/sample.rb
new file mode 100644
index 0000000..7d523a9
--- /dev/null
+++ b/app/models/sample.rb
@@ -0,0 +1,3 @@
+class Sample < ActiveRecord::Base
+      validates_presence_of :value
+end
diff --git a/db/migrate/20090522160717_create_samples.rb b/db/migrate/20090522160717_create_samples.rb

jasiek

class Basket < Struct.new(:entries)

  def self.new(*args)
    b = super(*args)
    b.entries ||= []
    b
  end

  def total
    entries.inject(0.0) do |sum, entry|

jasiek

(?<group-name>regular-expression){0}

jasiek

\g<group-name>

jasiek

(?<ltr>[ABCEGHJKLMNPRSTVXYWZ]){0}
(?<num>[0-9]){0}
(?<fsa>\g<ltr>\g<num>\g<ltr>){0}
(?<ldu>\g<num>\g<ltr>\g<num>){0}
(?<cpc>\g<fsa> \g<ldu>){0}
^\d{5}|\g<cpc>$

jasiek

ruby-1.9.3-p0 :001 > def f(x, y=1)
ruby-1.9.3-p0 :002?>   method(__method__).parameters
ruby-1.9.3-p0 :003?> end
 => nil 
ruby-1.9.3-p0 :004 > f(1, 2)
 => [[:req, :x], [:opt, :y]]

jasiek

module M
  def hello
    1
  end
end

module N
  include M

jasiek

module M
  def method
    puts "hello"
  end
end

def execute(current_module, &block)
  Object.new.tap do |o|
    o.extend(current_module)
    o.instance_eval &block

jasiek

p = lambda { |x|
  x * 2
}

p === 7 #=> 14

jasiek

class Deferrable < SimpleDelegator

  # Public: Create a side thread that wraps whatever you need to have available in the future.
  def initialize(&blk)
    super(Thread.new(&blk))
  end

  # Internal: We need the result of the computation of this thread NOW, so block on it and return
  # the value.
  def __getobj__