[ruby-core:71324] [Ruby trunk - Feature #11537] Introduce "Safe navigation operator"

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Issue #11537 has been updated by Thomas Sawyer.


Philip Claren wrote:
> Thomas Sawyer wrote:
> > In this way is more an extension of the ternary operator -- the initial dot on the method signals the difference. This should also allow:
> > 
> >     u ? .profile ? .thumbnails ? .large : default
> 
> Although I agree that .? is not that intuitive to read, the extended ternary operator would have a problem: boolean false passes for the safe navigator (because it's a valid value) but not for the ternary operator.

Is allowing false necessary/useful? On the other hand, if it is, then might a nil-only ternary operator be useful too (regardless of this issue)?




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Feature #11537: Introduce "Safe navigation operator"
https://bugs.ruby-lang.org/issues/11537#change-54699

* Author: Hiroshi SHIBATA
* Status: Closed
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
I sometimes write following code with rails application:

```ruby
u = User.find(id)
if u && u.profile && u.profile.thumbnails && u.profiles.thumbnails.large
  ...
```

or

```ruby
# Use ActiveSupport
if u.try!(:profile).try!(:thumbnails).try!(:large)
 ...
```
I hope to write shortly above code. Groovy has above operator named "Safe navigation operator" with "`?.`" syntax.
Ruby can't use "`?.`" operator.

Can we use "`.?`" syntax. like this:

```ruby
u = User.find(id)
u.?profile.?thumbnails.?large
```

Matz. How do you think about this?




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