From: "shugo (Shugo Maeda)" <noreply@...>
Date: 2021-09-15T06:13:53+00:00
Subject: [ruby-core:105258] [Ruby master Feature#14579] Hash value omission

Issue #14579 has been updated by shugo (Shugo Maeda).

Status changed from Closed to Assigned

matz (Yukihiro Matsumoto) wrote in #note-16:
> I assumed the value should be a local variable. The merged patch calls the method when the local variable is not defined.
> I doubt this is sufficient behavior. Any opinion?

I believe a method should be called when a local variable is not defined.
Because it's convenient as knu stated, and because `{x:}` is a syntax sugar of `{x: x}` except that keywords are allowed.


----------------------------------------
Feature #14579: Hash value omission
https://bugs.ruby-lang.org/issues/14579#change-93668

* Author: shugo (Shugo Maeda)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
How about to allow value omission in Hash literals:

```ruby
x = 1
y = 2
h = {x:, y:}
p h #=> {:x=>1, :y=>2}
```

And in keyword arguments:

```ruby
def login(username: ENV["USER"], password:)
  p(username:, password:)
end

login(password: "xxx") #=> {:username=>"shugo", :password=>"xxx"}
```


---Files--------------------------------
hash_value_omission.diff (619 Bytes)


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