const [state, setState] = useState(optionalInitialState);


  1. const [state,setState] : Return of useState, the arguments allow reading and updating of the state associated with the hook instance.

    • state : Current state.

    • setState: Current status updater.

  2. useState( optionalInitialState ): Function that associates the state to the webcomponent:

    • optionalInitialState: Optional parameter that defines the initial state associated to the hook instance, If optionalInitialState is a function it will be executed in order to obtain the initial state only at the moment of the hook instance for the first time.


function MyComponent() {
  const [count, setCount] = useState(0);
  return <host onclick={() => setCount(count + 1)}> {count} </host>;

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