How to get array index values in Javascript [duplicate]

Question

Hi I can't get the value of a specific index of an array. I don't know why because if I try to log the entire array it works but with a specific index it doesn't work

This is my code, I use cloud firestore to get the ID of a document and save it into array

var idUsers = [];
const users_list = document.querySelector("#users_list");

db.collection("utenti").get().then(function(querySnapshot) {

    querySnapshot.forEach(function(doc) {
        users_list.innerHTML += "<a href='utente.html' class='collection-item black-text'>" + doc.data().nome + " " + doc.data().cognome + " " + " </a>";
        idUsers.push(doc.id);
      });
});

console.log(idUsers);
console.log(idUsers[0]);

This is the result in Chrome console enter image description here

see here stackoverflow.com/questions/42991854/…

Maher Fattouh
– Maher Fattouh

2019-07-06 10:50:03 +00:00
Commented Jul 6, 2019 at 10:50 — Maher Fattouh
– Maher Fattouh, Commented Jul 6, 2019 at 10:50

Mahyar Mottaghi Zadeh · Accepted Answer · 2019-07-06 10:50:29Z

-1

Although it is considered to be a confusing statement, I assume that the operation is running asynchronously. Try to put a delay and then find value of idUsers[0] in order to find out the assumption.

answered Jul 6, 2019 at 10:50

Mahyar Mottaghi Zadeh

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