how to use ,merge: true in adding data firestore firebase code example

Example 1: firestore set a document

let data = {
  name: 'Los Angeles',
  state: 'CA',
  country: 'USA'
};

// Add a new document in collection "cities" with ID 'LA'
let setDoc = db.collection('cities').doc('LA').set(data);

Example 2: document.set() firebasefirestore java

// Create an initial document to update.var frankDocRef = db.collection("users").doc("frank");frankDocRef.set({    name: "Frank",    favorites: { food: "Pizza", color: "Blue", subject: "recess" },    age: 12});// To update age and favorite color:db.collection("users").doc("frank").update({    "age": 13,    "favorites.color": "Red"});

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Misc Example

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