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Documentation

Client.decrBy(key, decrement)

Open source

Client.decrBy(key, decrement)

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

Parameters

Parameter	Type	Description
`key`	string	the key to decrement.
`decrement`	number	the amount to decrement by

Returns

Type	Resolves with	Rejected when
`Promise<number>`	On success, the promise resolves with the value of `key` after the decrement.	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';

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

  const value = await redisClient.decrBy('mykey', 2);
  if (value !== 8) {
    throw new Error('mykey should have been 8');
  }
}