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Grafana k6 JavaScript API k6/experimental redis Client Client.decrBy(key, decrement)
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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

ParameterTypeDescription
keystringthe key to decrement.
decrementnumberthe amount to decrement by

Returns

TypeResolves withRejected 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

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 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');
  }
}