On Fri, Feb 15, 2013 at 11:54 PM, Jesse F. <[email protected]> wrote:
> I came up with the same answer. Almost the same code, except I don't
> need the Form to know which Items are its.
but you said earlier:
> Form has an each method to iterate over FormItems.
Then how do you access them (e.g. in #each) if they are created in
Form's constructor and immediately forgotten?
> They're read only, and Form
> has all the data. But Form has defaults and variables FormItems needs to
> read/write.
So FormItems are read only but they modify their container? You could
then make them immutable.
FormItem = Struct.new :container, :data do
def display
puts "This is a silly example: #{data}"
container.shown += 1
self
end
end
class Form
attr_accessor :shown
def initialize(data)
@items = data.map {|d| FormItem[self, d].freeze}
@shown = 0
end
include Enumerable
def each(&b)
@items.each(&b)
self
end
end
ff = Form.new 5.times.to_a
ff.each {|fi| fi.display}
puts ff.shown
ff.first.data = "boom"
> I was looking for something like a .Net interface. I guess I just have
> to stop fighting it.
It's always a good strategy to not expect your new programming
language to be the same as the old one. :-)
Kind regards
robert
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
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