Issue #19634 has been updated by matz (Yukihiro Matsumoto). Probably, you are proposing `mentor_proposals in ^mentor_name => [*, ^mentee_name, *]`. I still cannot imagine the case where dynamic key is useful. As far as I know, no other language support dynamic key matching. Please be more concrete to persuade us (preferably, with pseudo code). Matz. ---------------------------------------- Feature #19634: Pattern matching dynamic key https://bugs.ruby-lang.org/issues/19634#change-103135 * Author: baweaver (Brandon Weaver) * Status: Open * Priority: Normal ---------------------------------------- I found myself in a situation ([stable marriage problem](https://rosettacode.org/wiki/Stable_marriage_problem#top-page)) where I would like to match against a dynamic key, like so: ```ruby mentor_proposals = { mentor_name: ['mentee_1', 'mentee_2'] } mentor_name = :mentor_name mentee_name = 'mentee_1' mentor_proposals in ^key: [*, ^mentee_name, *] # SyntaxError ``` Currently this is not supported syntax, but there are some use cases in which I might see myself wanting to use it including this one. As `deconstruct_keys` currently accepts an `Array` of keys this would not break compatibility but would introduce syntactic complexity in capturing keys on hash-like matches. I believe the tradeoff is worthwhile, but would like to hear others opinions on the matter. Granted this case has some oddities of `Symbol` and `String` interchangeability as an implementation detail, and I will not be arguing for key irreverence in this issue as that's a [much more involved topic](https://dev.to/baweaver/the-case-for-pattern-matching-key-irreverence-in-rub...). -- https://bugs.ruby-lang.org/