Returning undefined when i tried to return db search result

Question

I creating electron app with neDB.

I want to create function:

const getAllHosts = (db) => {
    db.find({}, (err, hosts) => {
        return hosts
    })
}

But when i call this function, it return undefined, i tried to change it to async, but it not helped me.

`return hosts;` does not return the value to `getAllHosts`. – Lab Jan 10 '21 at 07:38 — Lab, Jan 10 '21 at 07:38

score 0 · Accepted Answer · answered Jan 10 '21 at 07:34

Because you're not returning anything from getAllHosts.

Try like this

const getAllHosts = (db) => {
   return new Promise((resolve, reject) => {
     db.find({}, (err, hosts) => {
       if (err) return reject(err);
       resolve(hosts)
     })
  })
}

getAllHosts().then(hosts => console.log(hosts)).catch(err => console.err(err))

If your db.find already returns a promise, you can try something like this

const getAllHosts = async (db) => {
   try {
     const hosts = await db.find({})
     return hosts
   } catch(err) {
     throw err
   }
}

getAllHosts().then(hosts => console.log(hosts)).catch(err => console.err(err))

That(`return db.find({})`) works, but you might need to handle errors whenever you calls it. — Naren, Jan 10 '21 at 08:28

Returning undefined when i tried to return db search result

1 Answers1