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Returns the length of the list stored at key. If key does not exist, it is interpreted as an empty list and 0 is returned.


keystringkey holding the list to get the length of.


TypeResolves withRejected when
Promise<number>On success, the promise resolves with the length of the list at key.If the list does not exist, the promise is rejected with an error.


import redis from 'k6/experimental/redis';
// Get the redis instance(s) address and password from the environment
const redis_addrs = __ENV.REDIS_ADDRS || '';
const redis_password = __ENV.REDIS_PASSWORD || '';
// Instantiate a new redis client
const redisClient = new redis.Client({
addrs: redis_addrs.split(',') || new Array('localhost:6379'), // in the form of 'host:port', separated by commas
password: redis_password,
export default function () {
.rpush('mylist', 'first')
.then((_) => redisClient.rpush('mylist', 'second'))
.then((_) => redisClient.rpush('mylist', 'third'))
.then((_) => redisClient.llen('mylist'))
.then((length) => {
if (length !== 3) {
throw new Error('llen operations should have returned 3');