Updating/Reassigning Object in Array

[MatthewMahabeer]

Saw many examples of mutating objects and arrays but not an array of objects and the conventional methods don't seem to be working. Any help? Simply trying to find and update an object in the array.

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Instead of Object.assign, I also tried deckList[index] = get(deckOperatorAtom).

[dai-shi]

Updating arrays immutably is not very easy. This applies to not only jotai but useState and others too.
You could do in various ways, including libraries, but what I would usually do in plain JS is this:

const arr = [{ id: 1, name: 'React' }, { id: 2, name: 'Hooks' }]

// updating name of id=1 to "Jotai"
const index = arr.findIndex((item) => item.id === 1)
const newArr = [
  ...arr.slice(0, index),
  { ...arr[index], name: 'Jotai' },
  ...arr.slice(index + 1)
]

[MatthewMahabeer]

Thanks for the reply!
Will that approach work within the (get, set) function in jotai?

[dai-shi]

Yes, it should.

Copy-and-mutate should work too:

const index = arr.findIndex((item) => item.id === 1)
const newArr = [...arr]
newArr[index] = { ...arr[index], name: 'Jotai' }