Async function returning undefined variable

Question

I'm trying to return a boolean from an async function, but is is coming out as undefined.

checkIfEmptyDb = async => {
    var ref = firebase.database().ref("dynamicDb");
    ref.once("value").then(snapshot => {
      const a = snapshot.exists();
      console.log(a); // false
      return a;
    });
  };

  getRandomWordFromDb = async () => {
    let moreWords = await this.checkIfEmptyDb();
    console.log("moreWords", moreWords); //UNDEFINED

My solution so far is to set the state of the react app in the checkIfEmptyDbfunction, which then can be called in getRandomWordFromDb..

Thanks in advance!

forgot to add a return here: return ref.once("value").then()... — Amardeep Bhowmick
– Amardeep Bhowmick, Commented Mar 29, 2020 at 12:13

Inacio Schweller · Accepted Answer · 2020-03-29 12:14:32Z

1

You need to return the value of the promise:

  checkIfEmptyDb = async => {
    var ref = firebase.database().ref("dynamicDb");
    return ref.once("value").then(snapshot => {
      const a = snapshot.exists();
      console.log(a); // false
      return a;
    });
  };

answered Mar 29, 2020 at 12:14

Inacio Schweller

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