You make an interesting point. The current proposal focuses on *picking*,
meaning to make an entirely new object by plucking out properties. It
doesn't envision setting properties into an existing object.
Rather than thinking about picking as an extension to object literal
syntax, as I had been proposing in the following:
```
{ {p1, p2} = o }
```
which some people found a bit challenging, and to accomplish what you want,
would require saying
```
target = { ...target, {a, b, c} = srcObject};
```
we can think of your syntax
```
target.{a,b,c} = srcObject;
```
as a kind of natural, obvious extension of dot notation. In other words,
whereas `target.a = 42` sets the value of the `a` property of object
`target` to 42, your syntax sets multiple properties. It's almost as if
JavaScript had been waiting for two decades for this natural extension to
dot-based assignments to object properties.
The corresponding accessor syntax--reading out multiple property
values--then obviously becomes
```
target.{a, b, c}
```
which is an equally natural, obvious extension of dot notation. In other
words, whereas `target.a` obtains the value of the `a` property of object
`target`, this syntax obtains the value of multiple properties.
Given this nice symmetry and parity with other features, I have revised my
proposal back to an earlier version, where the picking syntax was
`obj.{prop1, prop2}`. The revised version of the proposal, including
putting this structure on the left side of an assignment, is at
https://github.com/rtm/js-pick-notation.
To me, things seem pretty simple:
1. There is a strong IRL need need for "picking"--plucking out, or setting
multiple properties at a time.
2. Existing dot notation such as `a.b` is almost begging us to extend it to
allow this in the form of `a.{b,c}`.
3.The proposed extensions to dot notation have very small syntactic
footprint.
4. In doing this, we can take advantage of the powerful deconstructing
assignment syntax already introduced.
Bob
On Mon, Feb 26, 2018 at 11:36 AM, Alex Shvets <[email protected]> wrote:
> Yes, I've read it, but I doesn't find something like this:
>
> target.{a,b,c} = srcObject
>
> Thank You!
> - Alexander Shvets
> https://github.com/transpiling/destructuring-into-object
>
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