nusco

rvm:           # list all the Rubies you want to test against
  - 1.9.3
  - jruby
  - rbx
script: "bundle exec rake test" # your test command goes here

nusco

class DoNotDisturb
  def initialize
    @desk = InformationDesk.new
  end
  
  def method_missing(name, *args)
    unless name.to_s == "emergency"
      hour = Time.now.hour
      raise "Out for lunch" if hour >= 12 && hour < 14
    end

nusco

class InformationDesk
  def emergency
    # Call emergency...
    "emergency() called"
  end
  
  def flights
    # Provide flight information...
    "flights() called"
  end

nusco

class Performer
  def method_missing(name, *args)
    "The duck will #{name}: #{args[0]}"
  end
end

duck = Performer.new
duck.sing("Quacking in the Rain")  # => "The duck will sing: Quacking in the Rain"
duck.dance("Swan Lake")            # => "The duck will dance: Swan Lake"

nusco

# =====================
# Spell: Symbol to Proc
# =====================

# Convert a symbol to a block that calls a single method.

[1, 2, 3, 4].map(&:even?)	# => [false, true, false, true]

# For more information: http://www.pragprog.com/titles/ppmetr/metaprogramming-ruby

nusco

# ===================
# Spell: Shared Scope
# ===================

# Share variables among multiple contexts in the same Flat Scope (https://gist.github.com/nusco/535082).

lambda {
  shared = 10
  
  self.class.class_eval do

nusco

# =================
# Spell: Self Yield
# =================

# Pass self to the current block.

class Person
  attr_accessor :name, :surname

  def initialize

nusco

# =================
# Spell: Scope Gate
# =================

# Isolate a scope with the class, module, or def keyword.

a = 1
defined? a # => "local-variable"

module MyModule

nusco

# ==============
# Spell: Sandbox
# ==============

# Execute untrusted code in a safe environment.

def sandbox(&code)
  proc {
    $SAFE = 2
    yield

nusco

# =======================
# Spell: Pattern Dispatch
# =======================

# Select which methods to call based on their names.

$x = 0

class C
  def my_first_method