Bug #22470: Array#find and Array#rfind arity change between versions 3 and 4

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 4.0.9
• Backport: 3.3: DONTNEED, 3.4: DONTNEED, 4.0: REQUIRED

[swebb (Steven Webb)]

Ruby 4 introduced native implementations of Array#find and Array#rfind (Feature #21678). However, the new implementations changed how it behaves with multiple arguments:

ruby 3.4.8:

ruby -e "[].find(1, 2)"
-e:1:in 'Enumerable#find': wrong number of arguments (given 2, expected 0..1) (ArgumentError)
	from -e:1:in '<main>'

ruby 4:

ruby -e "[].find(1, 2)" # returns an instance of Enumerable and doesn't generate any output

This feels like a bug to me as it means Array#find no longer has the same behaviour as Enumerable#find.

[swebb (Steven Webb)]

https://github.com/ruby/ruby/pull/19516

[Earlopain (Earlopain _)]

• Status changed from Open to Closed
• Backport changed from 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.3: DONTNEED, 3.4: DONTNEED, 4.0: REQUIRED