How can I efficiently update arrays within Firestore documents without overwriting the whole array?

Updating Arrays with Firestore

Firestore offers a straightforward method for updating arrays within documents, eliminating the need for overwriting the entire array.

The following functions enable array updates:

• arrayUnion(): Adds elements to an array, ensuring that duplicates are not included.
• arrayRemove(): Removes all instances of specified elements from an array.

Example code:

// Array union
firebase.firestore()
.collection('proprietary')
.doc(docID)
.update({ sharedWith: firebase.firestore.FieldValue.arrayUnion({ who: "[email protected]", when: new Date() }) })

// Array remove
firebase.firestore()
.collection('proprietary')
.doc(docID)
.update({ sharedWith: firebase.firestore.FieldValue.arrayRemove({ who: "[email protected]", when: new Date() }) })

These functions provide a simple and efficient way to manage arrays in Firestore, allowing developers to make targeted updates without affecting the entire array.

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