Destructure a nested object, but keep a reference to the nested object

Question

I have a simple use-case, but I think it's not possible with ES6 syntax. I'd like to use object destructuring to retrieve certain known properties from a nested object, but I'd also like a reference to that nested object so that I can pass it along to other functions which may care about other properties.

Here's an example object:

var record = {
    name: "foo",
    metadata: {
        createdDate: "2017-02-19",
        lastModifiedDate: "2018-07-24",
        type: "bar"
    }
};

At a certain point in my code, I'd like to extract some values from the metadata. At the same time, I'd also like to extract the entire metadata object:

let {
    metadata: {
        createdDate
    }
} = record;

if ( date( createdDate ).before( NEW_FEATURE_DATE ) ){
    oldFeature( metadata );
} else {
    newFeature( metadata );
}

Unfortunately, my reference to the metadata property is used purely for destructuring... it's value is undefined (technically, being undefined, it has no value).

I know I can solve this with something like

let {
        metadata: {
            createdDate
        }
    } = record,
    metadata = record.metadata;

or

let {
        metadata
    } = record,
    {
        createdDate
    } = metadata;

... but that seems kind of clumsy, doesn't it? Is there something I'm missing, or is this just a "gap" in the syntax?

Answer 1

You could just add another same property without destructuring.

var record = { name: "foo", metadata: { createdDate: "2017-02-19",  lastModifiedDate: "2018-07-24", type: "bar" } };

let { metadata: { createdDate }, metadata } = record;
//    ^^^^^^^^                                        for nested destructuring
//                               ^^^^^^^^             for the value

console.log(metadata);
console.log(createdDate);