From: "alexeymuranov (Alexey Muranov)" <redmine@...>
Date: 2012-07-10T22:26:04+09:00
Subject: [ruby-core:46299] [ruby-trunk - Feature #6717] Method like #instance_eval that returns self (like #tap)


Issue #6717 has been updated by alexeymuranov (Alexey Muranov).


=begin
It seems to me that the main question is if to allow other method that act like (({instance_eval})), or call it under the hood.  The advantage in my opinion is the possibility to use (({self})), instead of choosing and declaring a local variable like in:

 room_numbers = {}.tap { |h| (1..10).each { |n| h[n] = 100 + n } }

and that the object itself can be modified.  ((({tap})) will modify in place.)
=end

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Feature #6717: Method like #instance_eval that returns self (like #tap)
https://bugs.ruby-lang.org/issues/6717#change-27920

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


=begin
How about adding a method that acts like (({#instance_eval})), but returns (({self}))?

Call it (({Object#instance_tap})) for example, or (({Object#tweak!})):

 class Object
   def tweak!(*args, &block)
     instance_eval(*args, &block); self
   end
 end

This can be used to initialize a hash.  Instead of:

 room_numbers = (1..10).each_with_object({}) { |n, o| o[n] = 100 + n }

one would write:

 room_numbers = {}.tweak! { (1..10).each { |n| self[n] = 100 +n } }

Googling for this kind of method gave me this:
http://yuroyoro-blog.tumblr.com/post/24113917395/ruby-tap-instance-eval-tapeval
=end



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