From: nobu@...
Date: 2021-03-15T13:28:37+00:00
Subject: [ruby-core:102869] [Ruby master Feature#17718] a method paramaters object that can be pattern matched against

Issue #17718 has been updated by nobu (Nobuyoshi Nakada).

Description updated

Hanmac (Hans Mackowiak) wrote in #note-2:
> you want `**args`

I guess that the point is the keywords are checked, that is `get_perdiem(nation: "usa")` will raise an `ArgumentError`.

I think there was a proposal for a similar concept, "rest keywords including all keywords", but can't find it now.

----------------------------------------
Feature #17718: a method paramaters object that can be pattern matched against
https://bugs.ruby-lang.org/issues/17718#change-90929

* Author: dsisnero (Dominic Sisneros)
* Status: Open
* Priority: Normal
----------------------------------------
```ruby
def get_perdiem(city: nil, state: nil, zip:nil)

  case parameters_match  # (return an object of the parameters we can pattern match on)
  in {zip: zip}
     find_perdiem_by_zip(zip)
  in {state: s, city: c}
     find_perdiem_by_state_and_city(s, c)
  in { state: s}
     find_perdiem_by_state(s)
  else
     raise 'need combination of zip, city,state'
  end
end
```



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