How to return a variable from inside an arrow function?

Question

I am newbie to node and I am having hard time in getting a very basic thing.

    redis_client.get('foo', (err, reply) => {
      if (err) throw err;
      console.log(reply);
    });
    console.log(reply);

I want to access variable reply of line 3 in line 5. There is no issue till line 3. A simple function instead of an arrow function will also work for me.

Assign the call and return reply. – Kisaragi Jun 18 '21 at 20:23 — Kisaragi, Jun 18 '21 at 20:23

score 0 · Answer 1 · answered Jun 18 '21 at 20:31

0

You need to use a promise.


export function getFromCache (key) {
  return new Promise((res, rej)=>{ 
     return redis.get(key, (err,data)=>{

          if (err) {
                return rej(err)
           }

           return res(data);
     });
  });
}

answered Jun 18 '21 at 20:31

Ernesto

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Since the OP is fairly new at this, you should probably show them how to use the returned promise. – jfriend00 Jun 18 '21 at 20:33
Yes, I think that would be great. If told how to use the promise. – quickhaze Jun 18 '21 at 20:34

How to return a variable from inside an arrow function?

1 Answers1