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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
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);
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');
}
}