Re: Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread guest271314 
In this case you can utilize a single step by setting a default value for
```otherData```

```let {firstName, lastName, otherData = "otherData"} = user.profile;```


On Sun, May 26, 2019 at 2:56 PM Григорий Карелин  wrote:

> Yep, in the same way as destructuring would work
>
> вс, 26 мая 2019 г. в 17:52, guest271314 :
>
>> If not found in source ```firstName``` and/or ```lastName``` would be
>> assigned the value ```undefined```?
>>
>> On Sun, May 26, 2019 at 1:40 PM Григорий Карелин 
>> wrote:
>>
>>> Wouldn't it be nice to have syntax like this:
>>> const obj = { {firstName, lastName from user.profile}, otherData: 'other
>>> data'  };
>>> as a syntactic sugar for
>>> const obj = {firstName: user.profile.firstName, lastName:
>>> user.profile.lastName, otherData: 'other data'};
>>>
>>> Of cause at the moment we can write it in two steps:
>>> const {fistName, lastName} = userProfile;
>>> const obj = {firstName, lastName, otherData: 'other data'}
>>>
>>> But why use extra variables?
>>>
>>> Motivating example is lodash's .pick() method:
>>> https://lodash.com/docs/#pick
>>> ___
>>> es-discuss mailing list
>>> es-discuss@mozilla.org
>>> https://mail.mozilla.org/listinfo/es-discuss
>>>
>>
>
> --
> С уважением,
> Карелин Григорий
>
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Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread Bob Myers 
Similar proposals have been out there for years. For whatever reason, none
have gotten traction.

Under one proposal, your scenario would be

```
const obj ={...user_profile.{firstName, lastName}, otherData: 'other data'};
```

https://github.com/rtm/js-pick-notation

Bob

-- Forwarded message --

> From: "Григорий Карелин" 
> To: es-discuss@mozilla.org
> Cc:
> Bcc:
> Date: Sun, 26 May 2019 16:39:58 +0300
> Subject: Proposal: syntactic sugar for extracting fields from objects
> Wouldn't it be nice to have syntax like this:
> const obj = { {firstName, lastName from user.profile}, otherData: 'other
> data'  };
> as a syntactic sugar for
> const obj = {firstName: user.profile.firstName, lastName:
> user.profile.lastName, otherData: 'other data'};
>
> Of cause at the moment we can write it in two steps:
> const {fistName, lastName} = userProfile;
> const obj = {firstName, lastName, otherData: 'other data'}
>
> But why use extra variables?
>
> Motivating example is lodash's .pick() method:
> https://lodash.com/docs/#pick
>
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Re: Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread Michael Luder-Rosefield 
I tried to see if I could do this in a single destructuring step, but here
is what happened:

```
var user = { profile: { firstName: 'Bob', lastName: 'Ruffward', x: 'hi' } }
var obj = { ...({firstName, lastName} = user.profile), otherData:
'otherData' }
```

So... what happened? (I'm sure you all know already)

`obj` ended up with _all_ of `user.profile`'s properties:
```
{ firstName: "Bob", lastName: "Ruffward", x: "hi", otherData: "otherData" }
```
and `firstName` and `lastName` were assigned as global variables.

```
firstName \\ "Bob"
lastName \\ "Ruffward"
```

--
Dammit babies, you've got to be kind.


On Sun, 26 May 2019 at 15:56, Григорий Карелин  wrote:

> Yep, in the same way as destructuring would work
>
> вс, 26 мая 2019 г. в 17:52, guest271314 :
>
>> If not found in source ```firstName``` and/or ```lastName``` would be
>> assigned the value ```undefined```?
>>
>> On Sun, May 26, 2019 at 1:40 PM Григорий Карелин 
>> wrote:
>>
>>> Wouldn't it be nice to have syntax like this:
>>> const obj = { {firstName, lastName from user.profile}, otherData: 'other
>>> data'  };
>>> as a syntactic sugar for
>>> const obj = {firstName: user.profile.firstName, lastName:
>>> user.profile.lastName, otherData: 'other data'};
>>>
>>> Of cause at the moment we can write it in two steps:
>>> const {fistName, lastName} = userProfile;
>>> const obj = {firstName, lastName, otherData: 'other data'}
>>>
>>> But why use extra variables?
>>>
>>> Motivating example is lodash's .pick() method:
>>> https://lodash.com/docs/#pick
>>> ___
>>> es-discuss mailing list
>>> es-discuss@mozilla.org
>>> https://mail.mozilla.org/listinfo/es-discuss
>>>
>>
>
> --
> С уважением,
> Карелин Григорий
> ___
> es-discuss mailing list
> es-discuss@mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
>
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Re: Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread Григорий Карелин 
Yep, in the same way as destructuring would work

вс, 26 мая 2019 г. в 17:52, guest271314 :

> If not found in source ```firstName``` and/or ```lastName``` would be
> assigned the value ```undefined```?
>
> On Sun, May 26, 2019 at 1:40 PM Григорий Карелин 
> wrote:
>
>> Wouldn't it be nice to have syntax like this:
>> const obj = { {firstName, lastName from user.profile}, otherData: 'other
>> data'  };
>> as a syntactic sugar for
>> const obj = {firstName: user.profile.firstName, lastName:
>> user.profile.lastName, otherData: 'other data'};
>>
>> Of cause at the moment we can write it in two steps:
>> const {fistName, lastName} = userProfile;
>> const obj = {firstName, lastName, otherData: 'other data'}
>>
>> But why use extra variables?
>>
>> Motivating example is lodash's .pick() method:
>> https://lodash.com/docs/#pick
>> ___
>> es-discuss mailing list
>> es-discuss@mozilla.org
>> https://mail.mozilla.org/listinfo/es-discuss
>>
>

-- 
С уважением,
Карелин Григорий
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Re: Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread guest271314 
If not found in source ```firstName``` and/or ```lastName``` would be
assigned the value ```undefined```?

On Sun, May 26, 2019 at 1:40 PM Григорий Карелин  wrote:

> Wouldn't it be nice to have syntax like this:
> const obj = { {firstName, lastName from user.profile}, otherData: 'other
> data'  };
> as a syntactic sugar for
> const obj = {firstName: user.profile.firstName, lastName:
> user.profile.lastName, otherData: 'other data'};
>
> Of cause at the moment we can write it in two steps:
> const {fistName, lastName} = userProfile;
> const obj = {firstName, lastName, otherData: 'other data'}
>
> But why use extra variables?
>
> Motivating example is lodash's .pick() method:
> https://lodash.com/docs/#pick
> ___
> es-discuss mailing list
> es-discuss@mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
>
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Proposal: syntactic sugar for extracting fields from objects

2019-05-26 Thread Григорий Карелин 
Wouldn't it be nice to have syntax like this:
const obj = { {firstName, lastName from user.profile}, otherData: 'other
data'  };
as a syntactic sugar for
const obj = {firstName: user.profile.firstName, lastName:
user.profile.lastName, otherData: 'other data'};

Of cause at the moment we can write it in two steps:
const {fistName, lastName} = userProfile;
const obj = {firstName, lastName, otherData: 'other data'}

But why use extra variables?

Motivating example is lodash's .pick() method: https://lodash.com/docs/#pick
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