[NFR] Support for list()

[sergeyklay]

From @mruz on January 24, 2014 11:43

It would be nice to can use list():

var width, height;
list(width, height) = getimagesize(value["tmp_name"]);

Copied from original issue: phalcon/zephir#105

[sergeyklay]

From @wapmorgan on February 20, 2014 19:52

Agree.

[sergeyklay]

From @lstrojny on February 20, 2014 23:34

Wouldn’t proper destructuring be more desirable?

left, right = getimagesize(...}

[sergeyklay]

From @nkt on February 21, 2014 0:1

@lstrojny :+1: I think there is no o need to add new keyword.

var a, b, c;
let c = [1, 2];
let a, b = c;

[sergeyklay]

From @nkt on September 7, 2014 13:20

So, i've added support in parser for syntax like:

let [a, b, c] = arr;

@phalcon, @ovr, @mruz what do you think about this syntax? I've tried to add support for

let a, b, c = arr;

But failed.

[sergeyklay]

From @ovr on September 7, 2014 13:31

Vote for

let a, b, c = arr;

[sergeyklay]

From @nkt on September 7, 2014 13:33

@ovr I agree with your vote, but do u know how to add this in parser?

[sergeyklay]

From @ovr on September 7, 2014 13:40

@nkt Nope :smile:

[sergeyklay]

From @mruz on September 7, 2014 15:5

let [a, b, c] = arr;

Is enough for me.

[sergeyklay]

From @thaJeztah on September 7, 2014 15:58

I may actually prefer let [a, b, c] = arr.

It may be just me, but I would (at a glance) interpret

let a, b, c = arr

as

let a = arr; let b = arr; let c = arr;

The extra brackets would hint at 'something extra is performed here' when scanning code.

[sergeyklay]

From @phalcon on September 7, 2014 19:49

I'd prefer

let (a, b, c) = arr;

We can use this syntax in the future to assign the same value to every index in the array:

let [0, 1, 2] = null;

[sergeyklay]

From @aschwin on November 26, 2014 15:52

Is there a decision already for this issue?

[flyingangel]

Just want to add my bit..

Stolen from ECMAScript 6 (JS) : http://es6-features.org/#ArrayMatching

let [item0, , item2] = arr;  // => let item0 = arr[0], item[2] = arr;

http://es6-features.org/#ObjectMatchingDeepMatching

let { key1, key2{subkey} } = someObject; // => let key1 = someObject->key1, key2 = someObject->key2->subkey;
let { key1, key2[subIndex] } = someObject; // => let key1 = someObject->key1, key2 = someObject->key2["subIndex"];

That's if you want to reinvent the wheel, then please stay as close as some standardized language. Otherwise stick as close as PHP as possible (using parenthesis) : let [a, , c] = arr; Edit: bracket [] is the new standard of PHP7