[ruby-core:54930] [ruby-trunk - Feature #8396] Allow easier destructuring of MatchData

Issue #8396 has been updated by matz (Yukihiro Matsumoto).


I like the basic idea, but #to_ary is a method to convert into array implicitly, that means it expect the receiver provides array behavior.  MatchObject does not behave like Array.
Maybe we should add another implicit conversion method for right hand side of multiple assignment.

Matz.

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Feature #8396: Allow easier destructuring of MatchData
https://bugs.ruby-lang.org/issues/8396#change-39274

Author: goshakkk (Gosha Arinich)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


=begin

((*(I have opened ((<"a PR for this on GH @ rails/rails"|URL:https://github.com/ruby/ruby/pull/300>)) for this but @marcandre closed it and suggested I submit it here. I'll copy my proposal text here.)*))

Currently, you can get something out of (({MatchData})) like this:

 m = "2_apples".match /(\d+)_(apple|orange)s?/
 count, thing = m[1], m[2]
 # or
 _, count, thing = "2_apples".match(/(\d+)_(apple|orange)s?/).to_a
 # or
 count, thing = "2_apples".match(/(\d+)_(apple|orange)s?/).captures
 # or, as @marcandre suggested, you can use splat operator
 _, count, thing = * "2_apples".match /(\d+)_(apple|orange)s?/

However, this extra (({#to_a})) or (({#captures})) (or splat) that you have to add makes things slightly more verbose.

With this PR, it would be possible to do the following:

 count, thing = "2_apples".match /(\d+)_(apple|orange)s?/

Which looks a bit cleaner and nicer. So what do you think?

=end


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