Spread operator "is not defined" when trying to omit property

Asked May 01 '22 at 22:58

Active May 01 '22 at 22:58

Viewed 14 times

I'm new to react, i'm trying to do something that should be very simple: use the spread operator (...) to create a copy of an object OMITTING ONE PROPERTY...

I've tried to follow some posts here, when i test then in javascript emulator they work, but they dont work in my real case

const obj = { a : 'a', b : 'b', c : 'c'};
const [formData, setFormData] = useState({a,...obj});

console.log(formData);

I get the error

Uncaught ReferenceError: a is not defined

asked May 01 '22 at 22:58

Rafael Lima

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For that to work, you have to destructure, not spread – CertainPerformance May 01 '22 at 22:59
@CertainPerformance can you teach how to do? – Rafael Lima May 01 '22 at 23:04
The problem is the `a` variable inside the `useState` that is undefined, try to declare it before or after the obj – Girgetto May 01 '22 at 23:04
Did you read the linked question that shows how it works? – CertainPerformance May 01 '22 at 23:05
I had read them before and yet it doesn't work... say that a is not defined.... Is it native javascript or do i need to use a specific framework? – Rafael Lima May 01 '22 at 23:16

Spread operator "is not defined" when trying to omit property

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