[RFC] Destructuring Coalesce

Hey,

Am 16.10.2022 um 23:56 schrieb David Rodrigues david.proweb@gmail.com:

I like it!

But what should happen if:

[ $a ?? '123', $b ] = [];

$a is assigned 123, $b emits undefined key error.

[ $a ?? '123', $b ] = [ 1 ];

$a is assigned 1, $b emits undefined key error.

[ $a ?? '123', $b ] = [ 1, 2 ];

$a is assigned 1, $b is assigned 2.

It also supports ?: operator?

[ $a ?: '123' ] = []; so $a = '123'
[ $a ?: '123' ] = [ false ]; so $a = '123'
[ $a ?: '123' ] = [ 456 ]; so $a = 456

?: is out of scope of this RFC; a future RFC may want to take care of that.

Bob

Am 16.10.2022 um 23:11 schrieb Bob Weinand bobwei9@hotmail.com:

Hey,

I've written a small RFC about adding coalesce ability to list() destructuring.

This should enhance the ability to easily, concisely and readably destructure arrays with default values.

https://wiki.php.net/rfc/destructuring_coalesce https://wiki.php.net/rfc/destructuring_coalesce

Bob
Hey,

Given haven't heard much feedback, I'll open the vote by end of the week,

Bob

Unless I'm missing something, the one response you did get contained
some questions that you didn't answer?

As for my own reaction: the simple examples look useful, and maybe are
enough to include the feature. I find nested destructuring a bit
confusing to read at the best of times, and some of the examples like
[[$a ?? "default"] ?? []] = $array make me go a bit cross-eyed, but you
make a reasonable case for the choice of semantics, and I don't really
have a strong reason not to allow it.

Regards,

--
Rowan Tommins
[IMSoP]

Am 03.11.2022 um 20:55 schrieb Tim Düsterhus tim@bastelstu.be:

Hi

I've written a small RFC about adding coalesce ability to list() destructuring.
This should enhance the ability to easily, concisely and readably destructure arrays with default values.
https://wiki.php.net/rfc/destructuring_coalesce https://wiki.php.net/rfc/destructuring_coalesce

Unless I missed anything, all the examples in the RFC deal with absent array keys. Can you also add an example where the key is present, but the value is 'null' to make the behavior with regard to that explicit?

Best regards
Tim Düsterhus

There was actually one line saying ... if $array[0] is null or does not exist, but I've added a more specific example under use cases.

Bob