hey, just confused about the Boilerplate Code of Doc about ripple HOT 1 CLOSED

const update = updateCounter();

// Then you can update the state from inside the method by using a handler

// apply all pending modification to the ripple
// updateCounter(handler: (ripple) => void ) => void
updateCounter(ripple => {
  ripple.count++;
});

// cancel pending modifications
// update(handler: (ripple) => "restore") => void
update(ripple => "restore");

// reset the ripple to its initial state
// update(handler: (ripple) => "reset") => void
update(ripple => "reset");

// replace the ripple with a new value. Does not replace the initial state
// update(handler: (ripple) => typeof ripple) => void
update(ripple => {
  return {
    count: 0,
  };
});

class TodoService {
  constructor(protected update = updateTasks()) { }
  ...
}