Assign value to new object via destructuring

Question

How to assign to Object via destructuring? For example

let parameter = {id : 10, username : 'john'}
let obj = {}
({id : obj.iduser, username : obj.user} = parameter)

Expected :

{iduser : 10, user : 'John'}

But, i got an error :

ReferenceError: obj is not defined

do you want a new object or just two variables with the content? — Nina Scholz, Mar 12 '18 at 08:12
new object @NinaScholz. I know, if just with variable i don't using `let obj = {}` but i just using `let {id : iduser, user : username} = parameter` — Ade Firman Fauzi, Mar 12 '18 at 08:15

score 3 · Accepted Answer · answered Mar 12 '18 at 08:15

3

Terminating the let obj = {} line with a semicolon solves this:

let parameter = {id : 10, username : 'john'};
let obj = {};
({id : obj.iduser, username : obj.user} = parameter);
console.log(obj);

answered Mar 12 '18 at 08:15

Ori Drori

Why downvote? This is correct ! Thanks :3 But I don't get it, why without semicolon ruined everything? I think JS will fine without semicolon? – Ade Firman Fauzi Mar 12 '18 at 08:18
There are some edge cases in which a semicolon is required for the browser to interpret the code correctly. – Ori Drori Mar 12 '18 at 08:21

score 1 · Answer 2 · answered Mar 12 '18 at 08:15

1

You could destuct first and use shorthand properties for a new object.

let parameter = { id : 10, username : 'john' },
    { id: iduser, username: user } = parameter,
    obj = { iduser, user };
    
console.log(obj);

answered Mar 12 '18 at 08:15

Nina Scholz

2 Answers2