Actions
Bug #18994
closed
Range#last(n) returns empty for single-element Integer Range
Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-darwin20]
Description
Range#last(n) with a single-element of Integer returns an empty Array. It should return a one-element Array.
Interestingly, when the element is a String, last(n) returns a one-element Array, expectedly.
I have checked the behaviour with some selected past versions of Ruby. In up to Ruby-2.6.5, it worked correctly. In Ruby-2.7.0, it doesn't. Nor in Ruby-3, including the current version (Ruby-3.1.2).
The following demonstrates the behaviour (Ruby-3.1.2; same in Ruby-2.7.0). Only the first one does not work in the way it should.
(8..8).last(1) # => [] (!!) (should be: [8])
(8..8).to_a.last(1) # => [8]
(8..8).first(1) # => [8]
(?a..?a).last(1) #=> ["a"]
(?a..?a).to_a.last(1) #=> ["a"]
(?a..?a).first(1) #=> ["a"]
Updated by 
Updated by
Actions
Like0
Like0Like0Like0