ReactJS - prevState in the new useState React hook?

Question

I really like the new React hooks and I\'m using them frequently for a project I\'m working on. I\'m coming across a situation where I want to use the prevState in the

Answer 1

You have already the previous state in the destructed variable: someState

so you can do:

const [ someState, setSomeState ] = useState( new Map() )
setSomeState( someState.set( key, value ) )