Use State Wrong Implementation

closure_use_state_wrong_implementation.js

function useState(initialValue) {
  var _state = initialValue // private value
  function state() {
    return _state
  }
  function setState(newVal) {
    _state = newVal
  }
  return [_state, setState] // exposing functions for external use
};

const [count, setCount] = useState(1);
console.log(count); // 1
setCount(2);
console.log(count); // 1 !!!!! Why???