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I have in firebase firestore a Collection named users created with docs of unique id.

Now I would like to push them in an Array .

(In the usersCollection there are 3 users stored with the currentUser.uid )

Example:

fb.usersCollection.where("state", "==", 'online').get().then(querySnapshot => {
      querySnapshot.forEach((doc) => {
         const userName = doc.data().name
  this.markerMy = { name: userName }
// push userName inside randomArray
const randomArray = []
randomArray.push(this.markerMy)
I only get it so that I can push one user inside the Array, but not more.
You should declare randomArray before fb.usersCollection and call the push operation inside the callback as follows :
const randomArray = []
fb.usersCollection.where("state", "==", 'online').get().then(querySnapshot => {
      querySnapshot.forEach((doc) => {
        const userName = doc.data().name
        this.markerMy = {
          name: userName
        randomArray.push(this.markerMy)
        
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