how to get specific data from cloud firestore code example

Example 1: get data in from a collection firestore

db.collection("users").get().then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
        console.log(`${doc.id} => ${doc.data()}`);
    });

Example 2: collection get firesotre

async getMarker() {
    const snapshot = await firebase.firestore().collection('events').get()
    return snapshot.docs.map(doc => doc.data());
}