Issue #6373 has been updated by alexeymuranov (Alexey Muranov).


boris_stitnicky (Boris Stitnicky) wrote:
> matz (Yukihiro Matsumoto) wrote:
> > __id__ returns object_id number, identity here is supposed to return itself.
> > I agree with introducing method to return self, but not fully satisfied with the name 'identity'.
> > Any opinion?
> > 
> > Matz.
> 
> I did some thinking, and there is hardly anything better than 'identity'.
> 'identity_function' would be hypercorrect, and 'id' is commonly understood
> as identifier. In my personal library, I use 'ɪ' (small cap Unicode I) for
> identity mapping, though...

ID as an identifier or a piece of identification and Id as the *identity function* are two different meanings, as far as i understand.  Also it does not look to me like "method" and "function" have exactly the same semantics.
----------------------------------------
Feature #6373: public #self
https://bugs.ruby-lang.org/issues/6373#change-28758

Author: trans (Thomas Sawyer)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 2.0.0


=begin
This was recently suggested to me as an extension:

  class Object
    # An identity method that provides access to an object's 'self'.
    #
    # Example:
    #   [1,2,3,4,5,1,2,2,3].group_by(&:identity)
    #   #=> {1=>[1, 1], 2=>[2, 2, 2], 3=>[3, 3], 4=>[4], 5=>[5]}
    #
    def identity
      self
    end
  end

First, is such a method commonly useful enough to warrant existence?

Second, it makes me wonder if #self should be a public method in general.
=end


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