From: "nagachika (Tomoyuki Chikanaga)" Date: 2022-10-23T10:41:48+00:00 Subject: [ruby-core:110489] [Ruby master Bug#18994] Range#last(n) returns empty for single-element Integer Range Issue #18994 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 2.7: WONTFIX, 3.0: REQUIRED, 3.1: REQUIRED to 2.7: WONTFIX, 3.0: REQUIRED, 3.1: DONE ruby_3_1 941c888b041decb45034572d766120f9be34986e merged revision(s) bbe5ec78463f8d6ef2e1a3571f17357a3d9ec8e4. ---------------------------------------- Bug #18994: Range#last(n) returns empty for single-element Integer Range https://bugs.ruby-lang.org/issues/18994#change-99810 * Author: masasakano (Masa Sakano) * Status: Closed * Priority: Normal * ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-darwin20] * Backport: 2.7: WONTFIX, 3.0: REQUIRED, 3.1: DONE ---------------------------------------- `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. ```ruby (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"] ``` -- https://bugs.ruby-lang.org/ Unsubscribe: