CODEWITHSUNDEEP
node.jsredisnode-redis
Muntaser Ahmed
Muntaser Ahmed

Reputation: 4647

redis.lindex() is returning true rather than the value at the index

I have an existing key value list: key value1 value2.

In redis-cli, I run LRANGE key 0 -1, which returns:

1) value1
2) value2

This confirms that the key value list exists. In redis-cli, running LINDEX key 0 returns:

"value1"

However, in my node app, when I execute console.log(redis.lindex('key', 0)), it prints true rather than the value at the index.

What am I doing wrong?

Note: I'm using the node-redis package.

Upvotes: 3

Views: 2702

Answers (1)

Mike S
Mike S

Reputation: 42325

Calls to command functions in node-redis are asynchronous, so they return their results in a callback and not directly from the function call. Your call to lindex should look like this:

redis.lindex('key', 0, function(err, result) {
    if (err) {
        /* handle error */
    } else {
        console.log(result);
    }
});

If you need to "return" result from whatever function you're in, you'll have to do that with a callback. Something like this:

function callLIndex(callback) {
    /* ... do stuff ... */

    redis.lindex('key', 0, function(err, result) {
        // If you need to process the result before "returning" it, do that here

        // Pass the result on to your callback
        callback(err, result)
    });
}

Which you'd call like this:

callLIndex(function(err, result) {
    // Use result here
});

Upvotes: 9

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