From: "zzak (Zachary Scott)" <zachary@...>
Date: 2013-06-02T16:23:43+09:00
Subject: [ruby-core:55244] [ruby-trunk - Feature #8449] Array#ary_plus always returns an array


Issue #8449 has been updated by zzak (Zachary Scott).

Category set to core
Assignee set to nobu (Nobuyoshi Nakada)

For what it's worth this happens with String too:

>> class Substring < String; end
=> nil
>> a = Substring.new
=> ""
>> b = Substring.new
=> ""
>> result = a + b
=> ""
>> result.class
=> String

Maybe nobu can tell us
----------------------------------------
Feature #8449: Array#ary_plus always returns an array
https://bugs.ruby-lang.org/issues/8449#change-39636

Author: txemagon (Jos�� M. Gonz��lez)
Status: Open
Priority: Normal
Assignee: nobu (Nobuyoshi Nakada)
Category: core
Target version: 


=begin

Even when Array is subclassified, + operator keeps on returning an Array.

Don't know if it is a bug or intentional, but it has surprised me for sure.

I paste some code for demonstrational purposes:
  

 #!/usr/bin/env ruby
 #ary_plus.rb
 
 # Shows an unexpected behavior to me
 # when adding Array subclasess.
 
 class Subarray < Array; end
 
 a = Subarray.new
 b = Subarray.new
 
 result = a + b
 # I was expecting to have a Subarray back
 
 unless result.is_a? Subarray
 puts "result is not a [Subarray]"
 end
 
 puts "result variable is a [#{result.class.name}]"
 
=end



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