Issue #21678 has been updated by matz (Yukihiro Matsumoto). The `Enumerable` module basically relies on the `#each` method which only works in the forward direction, and the only way to scan backwards is to convert it to an array once. I agree with `Array#rfind` (which can be implemented efficiently), but is it necessary for the `Enumerable` module as well? Matz. ---------------------------------------- Feature #21678: Enumerable#rfind https://bugs.ruby-lang.org/issues/21678#change-115173 * Author: kddnewton (Kevin Newton) * Status: Open ---------------------------------------- I'd like to introduce `rfind` to enumerable, which would effectively be the same as `reverse_each.find`. I've found myself using this a surprising number of times, and have been surprised at its omission. That means either falling back to `reverse_each` or `rindex`. For context, here are a couple of examples of this in the wild: * [pry](https://github.com/pry/pry/blob/80816f596774d00afdc81a555724b0819bf26782/lib...) * [bundler](https://github.com/ruby/rubygems/blob/e4fd4ee3fad005fce1dbcbeffd47e7199243bc...) * [textbringer](https://github.com/shugo/textbringer/blob/738d318558045efc9d978e6b5616d2641a...) -- https://bugs.ruby-lang.org/