How do I convert this await call to a promise style .then call-CodePudding

async function getRedisKeyAsync(key){
    var value = await client.get(key);
    console.log('got value '   value   ' for key '   key   ' in redis');
    return value;
}

async function getRedisKeyPromise(key){
    client.get(key).then(
        (value) => {
            console.log('got value '   value   ' for key '   key   ' in redis');
            return value;
        }
    );
}

In both cases, value for key is fetched from redis correctly. But a caller of these functions get the value back only in the first case.

var value1 = await myredis.getRedisKeyAsync(req.params.key); // works

var value2 = await myredis.getRedisKeyPromise(req.params.key); // value2 is undefined

How do I rewrite getRedisKeyPromise so that it behaves the same as getRedisKeyAsync ?

CodePudding user response：

Try by adding return to second function

async function getRedisKeyPromise(key) {
  return client.get(key).then(
    (value) => {
      console.log('got value '   value   ' for key '   key   ' in redis');
      return value;
    }
  );
}

CodePudding user response：

You can just simplify it:

function getRedisKeyPromise(key){
    return client.get(key)
}

It does the equivalent task like async or just .then()