MaxInterview - firestore update array

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1let washingtonRef = db.collection('cities').doc('DC');
2
3// Atomically add a new region to the "regions" array field.
4let arrUnion = washingtonRef.update({
5  regions: admin.firestore.FieldValue.arrayUnion('greater_virginia')
6});
7// Atomically remove a region from the "regions" array field.
8let arrRm = washingtonRef.update({
9  regions: admin.firestore.FieldValue.arrayRemove('east_coast')
10});

1var washingtonRef = db.collection("cities").doc("DC");
2// Atomically add a new region to the "regions" array field.
3washingtonRef.update({
4    regions: firebase.firestore.FieldValue.arrayUnion("greater_virginia")
5});
6// Atomically remove a region from the "regions" array field.
7washingtonRef.update({
8    regions: firebase.firestore.FieldValue.arrayRemove("east_coast")
9});

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