From: "alexeymuranov (Alexey Muranov)" <redmine@...>
Date: 2013-02-08T22:41:44+09:00
Subject: [ruby-core:52035] [ruby-trunk - Feature #6721] Object#yield_self


Issue #6721 has been updated by alexeymuranov (Alexey Muranov).


=begin
Here is a "real life" use case.  It again has to do with formatting strings.

I want to have a list of conference participants in the form:
 Full Name (Affiliation, academic position)
but without empty parentheses or trailing comma if the person has not
profided the affiliation or the position.  So i did like this:

  class Participant
    def full_name_with_affiliation_and_position
      full_name +
        lambda { |a_ap| a_ap.empty? ? '' : " (#{ a_ap })" }[[affiliation, academic_position].compact.join(', ')]
    end
  end

(I will appreciate any more elegant solution.)

With (({#yield_self})) (or any other name for it), i would have written:

  class Participant
    def full_name_with_affiliation_and_position
      full_name +
        [affiliation, academic_position].compact.join(', ')].yield_self { |a_ap| a_ap.empty? ? '' : " (#{ a_ap })" }
    end
  end

This would be a bit more readable for me.
=end

----------------------------------------
Feature #6721: Object#yield_self
https://bugs.ruby-lang.org/issues/6721#change-36056

Author: alexeymuranov (Alexey Muranov)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: next minor


=begin
I think the following method is missing from Ruby:

 class Object
   def yield_self(*args)
     yield(self, *args)
   end
 end

I do not know a good use case, but it looks very natural to me.  It can be used in method chains.

What do you think?  Is there an alternative?
=end



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