[ruby-core:81142] [Ruby trunk Feature#13559] Change implementation of Feature #6721

Issue #13559 has been updated by nobu (Nobuyoshi Nakada).

Description updated

zverok (Victor Shepelev) wrote:
> ```ruby
> url.itself # return itself
> url.itself { |u| open(u).read } # return "itself -> fetch from the network"
> ```

It does not seem to return something other than `url` "itself".

> There are some other good options (listed, for ex., [here](https://bugs.ruby-lang.org/issues/12760#note-5)), that are easy to read, like `apply`, `as`, `chain`, that will produce the code you could read "naturally". 

And `let`... but it is used by RSpec.
Or `progn`?




----------------------------------------
Feature #13559: Change implementation of Feature #6721
https://bugs.ruby-lang.org/issues/13559#change-64793

* Author: dunrix (Damon Unrix)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Hi,

please reconsider implementation of feature request #6721 planned for Ruby 2.5.0 .

Instead of introducing new method `Object#yield_self`, just reuse existing `Object#itself` by taking an optional block argument.

Find it much clearer and more logical solution, not superfluous polluting of API space.
`Object#itself` just returns target object, optional block would return alternative value with target object passed as block argument.

Prototyped sol. in Ruby:

~~~ruby
class Object
  def itself
    block_given? ? yield(self) : self
  end
end
~~~

Not aware of any case, where it would break backward compatibility.




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