decrimentQty method

void decrimentQty(
  1. String carId
)

Implementation

void decrimentQty(String carId) {
  Cart item = _shoppingCart.where((element) => element.id == carId).first;

  if (item.quantity > 1) {
    item.quantity--;
  } else {
    _shoppingCart.remove(item);
  }
  notifyListeners();
}