[LRUG] Getting rid of 'proc'

[Eleanor]

On 18 Apr 2007, at 11:13, Paul Battley wrote:
> #!/usr/bin/env ruby
>
> class A
>  def define(&blk)
>    @fn = blk
>  end
>
>  def evaluate(context)
>    context.instance_eval(&@fn)
>  end
> end
>
> class B
>   def initialize
>     @foo = 42
>   end
> end
>
> a = A.new
> a.define do
>  p @foo
> end
> b = B.new
> a.evaluate(b) # => 42

I may be missing something obvious here, but surely for that to work  
the 'define' and 'evalute' methods would have to be implemented in  
the class handling the view? I've not explored that aspect of Rails  
much so I don't know how easy this would be to implement cleanly, but  
compared to the explicit use of a Proc object it seems somewhat less  
obvious.


Ellie

Eleanor McHugh
Games With Brains
----
raise ArgumentError unless @reality.responds_to? :reason