Mirah: some thoughts on this & self in closures

scoping_closures.mirah

# Some of my thoughts
#
# this one's easy
addListener do |event|
  self # < outer scope self
end

# but what about
addListener do 
  def respond event
    self # < closure self? or outer self
  end
end

# if self is a closure's self, what about
@foo = 1
addListener do
  def respond event
    @foo.wob event    # whose @foo are you?
  end
end

# even more ambiguous
@foo = 1
addListener do
  def initarable
    @foo = :wargh
  end
  def respond event
    @foo.wob event # whose @foo are you? really!
  end
end


# could add a special self only for closures
addListener do 
  def respond event
    self                     # < outer self
    sekret_self          # < closure self
  end
end
# but that doesn't solve instance variables
#
# Do people care about instance variables and self on their closures?
#
# The simplest fix is to have all scoping defer to the outer scope.
# But then you can't do this
addListener do
  def genericRespond event
    puts "flibble-flabble"
  end
  def respondA event
    genericRespond event
  end
  def respondB event
     genericRespond event
  end
end


# I guess you could work around that by having that method on the
# outer scope
def genericRespond event
  puts "flibble-flabble"
end
addListener do
  def respondA event
    genericRespond event
  end
  def respondB event
     genericRespond event
  end
end

# And what happens when you've got nested closures?
addListener do
  def respond event
    event.backToTheFuture do
      puts "Doc!"
      self.run # who is self now?
    end
  end
end