Feature #20040: Make Hash respond do deconstruct to allow matchting key/value pairs

• Status: Open
• Assignee: -
• Target version: -

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

[matz (Yukihiro Matsumoto)]

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

Matz.