deleting firebase collections in swift code example

Example 1: how to delete firebase collection

this.db
  .collection('cart')
  .get()
  .toPromise()
  .then((querySnapshot) => {
  querySnapshot.forEach((doc) => {
    doc.ref.delete();
  });
});

Example 2: firestore delete document by id

const res = await db.collection('cities').doc('DC').delete();