Client.incrBy(key, increment)

Increments the number stored at key by increment. If the key does not exist, it is set to zero before performing the operation.

Parameters

Parameter	Type	Description
`key`	string	the key to increment
`increment`	number	the amount to increment by

Returns

Type	Resolves with	Rejected when
`Promise<number>`	On success, the promise resolves with the value of `key` after the increment.	If the key contains a value of the wrong type, or contains a string that cannot be represented as an integer, the promise is rejected with an error.

Example

import redis from 'k6/experimental/redis';

// Instantiate a new redis client
const redisClient = new redis.Client('redis://localhost:6379');

export default async function () {
  await redisClient.set('mykey', 10, 0);

  let value = await redisClient.incr('mykey');
  value = await redisClient.incrBy('mykey', value);
  value = await redisClient.decrBy('mykey', value);
  value = await redisClient.decr('mykey');
  if (value !== -1) {
    throw new Error('mykey should have been -1');
  }
}