From: "drbrain (Eric Hodel)" <drbrain@...7.net>
Date: 2013-03-01T12:56:19+09:00
Subject: [ruby-core:53061] [ruby-trunk - Feature #7986] Custom case statement comparison method


Issue #7986 has been updated by drbrain (Eric Hodel).


=begin
Why not use the features of case statements properly?  For classes, place the subclass above the superclass.  For array inclusion, use splat:

  class Foo; end
  class Bar < Foo; end
  
  def case_klass obj
    case obj
    when Bar
      p "Bar!"
    when Foo
      p "Foo, not Bar!"
    end
  end
  
  case_klass Foo.new
  case_klass Bar.new
  
  def case_include obj
    case obj
    when *%w[b]
      p "b includes name, not a"
    when *%w[a]
      p "a includes name"
    else
      p "neither a or b includes name"
    end
  end
  
  case_include 'a'
  case_include 'b'
  case_include 'c'

=end

----------------------------------------
Feature #7986: Custom case statement comparison method
https://bugs.ruby-lang.org/issues/7986#change-37215

Author: trans (Thomas Sawyer)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: Next Major


=begin
Case statements use #=== to handle matching, but sometimes this can be limiting. It such cases it would be helpful to be able to specify the comparison method. So I wondered if that could be done by hanging the method off the `case` keyword, e.g.

    class Bar < Foo; end

    case == obj.class
    when Foo
      p "Foo, not Bar!"
    when Bar
      p "Bar!"
    end

And

    case.include? name
    when a
      p "a includes name"
    when b
      p "b includes name, not a"
    else
      p "neither a or b includes name"
    end
=end



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