From: dblack@...
Date: 2006-11-17T08:20:12+09:00
Subject: Re: #returning and #tap

Hi --

On Fri, 17 Nov 2006, Joel VanderWerf wrote:

> Does the following technique seem odd?
>
> class Foo
>  attr_accessor :a, :b, :c
>  def initialize
>    yield self if block_given?
>  end
> end
>
> foo = Foo.new do |f|
>  f.a = 1
>  f.b = 2
>  f.c = 3
> end
>
> #then is just a way of using arbitrary classes (or factories) in this way. 
> Maybe the name should not emphasize the temporal ("then" or "whereupon"); so 
> maybe "tap" is better, or "configured_using".

Part of what's odd to me about #then is that it's not
constructor-specific.  Once it's defined you could do:

   x = string.split(',').then do |array|
     array.map! { something }
   end

Bad example :-)  But that's what I meant about not giving it too
specific a name, like "post_initialize", since it's not restricted to
initialization scenarios.


David

-- 
                   David A. Black | dblack@rubypal.com
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org