[ruby-core:56950] [ruby-trunk - Feature #6721] Object#yield_self

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


=begin
Another idea for the name: (({Object#cast})), by analogy with typecasting or cast iron.  Iron (an object) is poured into a mold (a proc or a block).

  class Object
    def cast(*args, &block)
      if block.nil?
        p = args.shift
        if p.is_a?(Proc)
          p[self, *args]
        else
          raise 'The first argument of Object#cast should be a Proc, unless a block form is used.'
        end
      else
        if args.empty?
          block[self]
        else
          raise 'Object#cast does not accept arguments together with a block.'
        end
      end
    end
  end

  2.cast {|x| x**3 } # => 8
  p = proc {|x, y| x**y }
  2.cast(p, 4) # => 16
=end

----------------------------------------
Feature #6721: Object#yield_self
https://bugs.ruby-lang.org/issues/6721#change-41509

Author: alexeymuranov (Alexey Muranov)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
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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