From: wycats@...
Date: 2015-10-26T12:25:26+00:00
Subject: [ruby-core:71186] [Ruby trunk - Feature #11537] Introduce "Safe	navigation operator"

Issue #11537 has been updated by Yehuda Katz.


Yukihiro Matsumoto wrote:
> I like the idea. My remaining concern is ".?" is too similar to "?." which is chosen by other languages.
> We cannot use "?." since it conflicts with a method call with a "*?" predicate method.
> 
> Matz.

I agree with this concern. I also agree with the idea of trying to make it more like a traditional infix operator by encouraging spaces.

What about:

~~~
u && .profile && .thumbnails && .large
~~~

As shorthand for:

~~~
u && u.profile && u.profile.thumbnails && u.profile.thumbnails.large
~~~

It reads nicely to me and its meaning is clear. It also doesn't conflict with Ruby's method predicates (`?` suffix).

Matz, what do you think?

----------------------------------------
Feature #11537: Introduce "Safe navigation operator"
https://bugs.ruby-lang.org/issues/11537#change-54565

* 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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