useState add to array in object code example

Example 1: add object to array setstate

To push to the beginning of the array do it this way

   this.setState( prevState => ({
     userFavorites: [{id: 3, title: 'C'}, ...prevState.userFavourites]
  }));

Example 2: add object to array react hook

setTheArray([...theArray, newElement]);