From: "matz (Yukihiro Matsumoto) via ruby-core" <ruby-core@...>
Date: 2023-12-06T00:14:16+00:00
Subject: [ruby-core:115596] [Ruby master Feature#20040] Make Hash respond do deconstruct to allow matchting key/value pairs

Issue #20040 has been updated by matz (Yukihiro Matsumoto).


Theoretically possible, but could you show us a specific use case, please?

Matz.


----------------------------------------
Feature #20040: Make Hash respond do deconstruct to allow matchting key/value pairs
https://bugs.ruby-lang.org/issues/20040#change-105527

* Author: Anonymous
* Status: Open
* Priority: Normal
----------------------------------------
It would be nice to allow pattern matching to work on key/value pairs of a Hash to e.g. find the first entry, or entries where the key is not known.

Example:

```
class Hash; def deconstruct = to_a; end

{a: 1, b: 2} => [[k, v], *]
puts "k=#{k}" # :a
puts "v=#{v}" # 1

{a: 1, b: 2} => [*, [k, 2], *]
puts "k=#{k}" # :b
```



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