Why is firebase data re-rendered in console?

Question

JavaScript

Hello. I am making a react native app and using firebase database.

Problem: I first call the get_data_DB function several times (for example 5 times) and it works fine, I get what I want. But after that I call the updateDB function (to set a new value to the firebase database), but it works strangely - it prints the value from the database to the console several times in a row (as many times as I called the get_dataDB function). But the fact is that in the updateDB function I do not call console.log () at all, especially several times.

// получение данных из firebase база данных в реальном времени
    const get_data_DB = () => {
        const database = firebase.database().ref('1').on('value', (snapshot) => {
          const highscore = snapshot.val().field1;
          console.log(highscore);
        })
      }

    // установить новые данные в firebase база данных в реальном времени
    function updateDB(userID, fieldValue1, fieldValue2) {
      firebase.database().ref(userID).set({
        field1: fieldValue1,
        field2: fieldValue2,
      });
    }

Answer 1

I do not understand these firebases, and I can only assume:
1. you create event listeners with your get_data_DB calls (5 times). each run is a unique listener.
2. updateDB call inserts data and generates an update event (for which you already have 5 listeners). and they all show in the console, because you yourself wrote it in the listener.