[ruby-core:100790] [Ruby master Feature#17315] Hash #transform

Issue #17315 has been updated by marcandre (Marc-Andre Lafortune).


I didn't suggest anything, as I don't see a good name, and I don't see the appeal of this method:
- it can not be more efficient than `update` + `to_h`
- there's not a frequent usecase that I know of
- seems like avoidable mutation
- `to_h!` would be strange (conversion + mutation...?)

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Feature #17315: Hash #transform
https://bugs.ruby-lang.org/issues/17315#change-88434

* Author: dsisnero (Dominic Sisneros)
* Status: Open
* Priority: Normal
----------------------------------------
Add new methods to `transform` or `transform!` both the keys and the values of a hash.
#7793 

```ruby
h = {'name' => 'dominic ', 'email' => 'dominic.mail.com '}
h.transform!{|k,v| [k.to_sym, v.strip]}
h # => {name: 'dominic', email: 'dominic.mail.com'}
```



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