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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

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Open source

Client.llen(key)

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.

Parameters

ParameterTypeDescription
keystringkey holding the list to get the length of.

Returns

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.

Example

JavaScript 
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 () {
  redisClient
    .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');
      }
    });
}