From: Timothy Goddard <interfecus@...>
Date: 2006-03-08T20:08:41+09:00
Subject: Re: Having a block executed in the context of an instance

In my opinion, this is unneccesary and still a bit confusing unless the
object has a limited lifetime (as in the case of IO resources) or will
change state when the block is ended. You could use:

button = Button.new
button.caption = 'Click Me'

Blocks are good for DSLs or management of _limited_ resources. It is a
bad idea to use the new method to provide a limited resource as this
will impair forward-compatability. A different method should be used
(and new possibly made private) to enable future change.

For button management I would use something along the lines of the DSL
outlined above but would use additional blocks in the same scope to
handle events.

button = Button.new do
  caption "Click Me" # Public method, button.caption and
button.caption= useable from outside

  on_click do
    caption "You Clicked Me!" # Can update attributes in response to
events with very little extra work.
  end
end