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Feature #8449
openArray#ary_plus always returns an array
Description
=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
Updated by zzak (zzak _) about 11 years ago
- 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
Updated by hsbt (Hiroshi SHIBATA) 5 months ago
- Status changed from Open to Assigned
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