Object Extract Method Suggestion

[Matthew Robb]

Personally I've been itching for object pattern-like pick syntax. I keep
finding myself doing the following pattern:

```
const {a=1,c=2} = obj;
return {a,c};
```

On May 8, 2017 6:37 AM, "Murat Gözel" <murat at gozel.com.tr> wrote:

> Hey everyone,
>
> The idea came up while i'm filtering spesific view of web page's text
> objects from whole context object. Objects are much more useful than any
> other type in many cases. I find myself working with more javascript
> objects project to project. Despite this, an object extract method can be
> useful for many cases. You can think of it as the opposite of assign
> method. It reduces the source object to a smaller object with only keys you
> spesified.
>
> Looks like this:
> ```javascript
> Object.extract(SourceObject, ArrayOfKeys)
> ```
>
> Example usage:
> ```javascript
> const contactPageExpressions = ['Follow Us', 'Phone', 'Email']
>
> const wholeContext = {
>   'Welcome': {
>     translation: 'Welcome'
>   },
>   'Follow Us': {
>     translation: 'Follow Us'
>   },
>   'Phone': {
>     translation: 'Phone Number'
>   },
>   'Email': {
>     translation: 'Email Address'
>   },
>   'News': {
>     translation: 'News'
>   }
> }
>
> const activeContext = Object.extract(wholeContext, contactPageExpressions)
>
> // Now we have an object that only has keys we want:
> {
>   'Follow Us': {
>     translation: 'Follow Us'
>   },
>   'Phone': {
>     translation: 'Phone Number'
>   },
>   'Email': {
>     translation: 'Email Address'
>   }
> }
> ```
>
> Since it works by matching keys, second parameter of the method can even
> be a regular expression:
>
> ```javascript
> // Get properties that has numbers.
> Object.extract(source, /[0-9]/g)
> ```
>
> Would like to hear your opinions.
>
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>
>
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