[ruby-core:105264] [Ruby master Feature#14579] Hash value omission

Issue #14579 has been updated by duerst (Martin D=FCrst).


shugo (Shugo Maeda) wrote in #note-26:
> duerst (Martin D=FCrst) wrote in #note-25:

> Technically speaking, `send(:if)` is used instead of local_variable_get i=
f the local variable is not defined.
> =

> > Not sure we need this, but also not sure it hurts.
> =

> In the meeting just after RubyKaigi, someone pointed out that `{if:}[:if]=
` is faster than `binding.local_variable_get(:if)`.

I don't think using `if` as the name of a local variable is a good idea, an=
d I don't think the speed of bad ideas should concern us too much.

----------------------------------------
Feature #14579: Hash value omission
https://bugs.ruby-lang.org/issues/14579#change-93674

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

```ruby
x =3D 1
y =3D 2
h =3D {x:, y:}
p h #=3D> {:x=3D>1, :y=3D>2}
```

And in keyword arguments:

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

login(password: "xxx") #=3D> {:username=3D>"shugo", :password=3D>"xxx"}
```


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


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