You've already forked node-redis
mirror of
https://github.com/redis/node-redis.git
synced 2025-07-31 05:44:24 +03:00
b2d35c5286
RESP3 Support - Some commands responses in RESP3 aren't stable yet and therefore return an "untyped" ReplyUnion. Sentinel TypeMapping Correctly types Multi commands Note: some API changes to be further documented in v4-to-v5.md
52 lines
2.0 KiB
JavaScript
52 lines
2.0 KiB
JavaScript
// Example to log traffic data at intersections for the city of San Francisco.
|
|
// Log license plates of each car scanned at each intersection and add to the intersections Hyperloglog.
|
|
// Reference: https://www.youtube.com/watch?v=MunL8nnwscQ
|
|
|
|
import { createClient } from 'redis';
|
|
|
|
const client = createClient();
|
|
|
|
await client.connect();
|
|
|
|
// Use `pfAdd` to add an element to a Hyperloglog, creating the Hyperloglog if necessary.
|
|
// await client.pfAdd(key, value)
|
|
|
|
// To get a count, the `pfCount` method is used.
|
|
// await client.pfCount(key)
|
|
|
|
try {
|
|
// Corner of Market Street (ID: 12) and 10th street (ID:27).
|
|
await client.pfAdd('count:sf:12:27', 'GHN34X');
|
|
await client.pfAdd('count:sf:12:27', 'ECN94Y');
|
|
await client.pfAdd('count:sf:12:27', 'VJL12V');
|
|
await client.pfAdd('count:sf:12:27', 'ORV87O');
|
|
|
|
// To get the count of Corner of Market Street (ID: 12) and 10th street (ID:27).
|
|
const countForMarket10thStreet = await client.pfCount('count:sf:12:27');
|
|
console.log(`Count for Market Street & 10th Street is ${countForMarket10thStreet}`);
|
|
// Count for Market Street & 10th Street is 4.
|
|
|
|
// Corner of Market Street (ID: 12) and 11 street (ID:26).
|
|
await client.pfAdd('count:sf:12:26', 'GHN34X');
|
|
await client.pfAdd('count:sf:12:26', 'ECN94Y');
|
|
await client.pfAdd('count:sf:12:26', 'IRV84E');
|
|
await client.pfAdd('count:sf:12:26', 'ORV87O');
|
|
await client.pfAdd('count:sf:12:26', 'TEY34S');
|
|
|
|
// To get the count of Corner of Market Street (ID: 12) and 11th street (ID:26).
|
|
const countForMarket11thStreet = await client.pfCount('count:sf:12:26');
|
|
console.log(`Count for Market Street & 11th Street is ${countForMarket11thStreet}`);
|
|
// Count for Market Street & 11th Street is 5.
|
|
|
|
// To merge the Hyperloglogs `count:sf:12:26` and `count:sf:12:27`.
|
|
await client.pfMerge('count:merge', ['count:sf:12:27', 'count:sf:12:26']);
|
|
const countMerge = await client.pfCount('count:merge');
|
|
console.log(`Count for the merge is ${countMerge}`);
|
|
// Count for the merge is 6.
|
|
} catch (e) {
|
|
// something went wrong.
|
|
console.error(e);
|
|
}
|
|
|
|
client.destroy();
|