Extensible destructuring proposal

Samuel Hapák samuel.hapak at vacuumapps.com
Tue Jul 21 18:27:17 UTC 2015

> On 21.7.2015, at 17:19, Domenic Denicola <d at domenic.me> wrote:
> From: Samuel Hapák [mailto:samuel.hapak at vacuumapps.com] 
>> Could you please explain it on example?
>> Let’s say I have
>> ```
>> let book = Map{author: {name: “John”, surname: “Doe”}, birthdate: “10-10-1990”};
>> ```
>> How would you extract `birthdate`? How would you extract `name`?
> Your syntax here is invalid in at least four different ways.
> If this is still confusing, you may wish to turn to StackOverflow for clarification, instead of es-discuss. 
I apologize for the syntax mistakes I made. I totally understand you receive tons of proposals from people who don’t bother to learn JavaScript. I understand that this pissed you off and I am sorry for that. My bad.

Here is the valid syntax:

let book = new Map([['author', Map([['name', 'John'], ['surname', 'Doe']]), ['birthdate', '10-10-1990']]);
let book2 = new Map([['birthdate', '10-10-1990'], ['author', Map([['name', 'John'], ['surname', 'Doe']])]]);

Now, I wish to extract `birthdate` and `name`. I can't rely on the order of elements, because the code should accept any `book` that has same shape. Let's say, ordering of the items in the map is not the part of the contract. So, to clarify this, I want to write function that accepts `book` or `book2` and inside, it extracts `birthdate` and `name`. The code should work with both `book` and `book2`.

I feel, that your solution is unable to achieve this, but I can be mistaken.



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