Issue #6373 has been updated by prijutme4ty (Ilya Vorontsov).


enum.map(&:identity) can be replaced with enum.to_a
But I think Object#identity is useful. Object#tap requires a block. It's not an option to use it in many cases. I can't imagine how to replace enum.group_by(&:identity) with tap instead of identity.

I think that tap method can be improved to be used without block yielding self. But for readability it'd be however aliased to identity.

__self__ looks like a method every programmer'd avoid.
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Feature #6373: public #self
https://bugs.ruby-lang.org/issues/6373#change-26286

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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