How to use useEffect inside map function?

Question

I have two tables in Firebase: Vouchers & ClaimedVouchers. I am trying to display the vouchers that do not appear in the ClaimedVouchers table. So, I have a query that gets

Answer 1

Just to highlight how you can use isClaimed as hoook and set state calling a async function inside it. Later use the above hook in a react component. Please follow below sanbox.

https://codesandbox.io/s/confident-cray-4g2md?file=/src/App.js