score:0
Accepted answer
const [items, setitems] = usestate([1, 2]);
items immutable. you can't manipulate that variable. you will have to make a new variable by spreading contents of items and do the manipulation on that, before updating values using setitems.
invalid
items.splice(index, 0, draggeditem);
valid
let newvaritem = [...items]
newvaritem .splice(index, 0, draggeditem);
Source: stackoverflow.com
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