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#2285-Add-example-scripts-hyperloglog - Added hyperloglog examples to… (#2289)

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* #2285-Add-example-scripts-hyperloglog - Added hyperloglog examples to address Issue #2285

* #2285-Add-example-scripts-hyperloglog - Added the results as comments

* #2285-Add-example-scripts-hyperloglog - Changes from review

* #2285-Add-example-scripts-hyperloglog - Changes from review
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ade1705
2022-10-14 15:34:06 -04:00
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parent 2a8e11a51d
commit 9398e5d05e
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examples/README.md
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@@ -11,6 +11,7 @@ This folder contains example scripts showing how to use Node Redis in different
| `count-min-sketch.js` | Estimate the frequency of a given event using the [RedisBloom](https://redisbloom.io) Count-Min Sketch | | `count-min-sketch.js` | Estimate the frequency of a given event using the [RedisBloom](https://redisbloom.io) Count-Min Sketch |
| `cuckoo-filter.js` | Space efficient set membership checks with a [Cuckoo Filter](https://en.wikipedia.org/wiki/Cuckoo_filter) using [RedisBloom](https://redisbloom.io) | | `cuckoo-filter.js` | Space efficient set membership checks with a [Cuckoo Filter](https://en.wikipedia.org/wiki/Cuckoo_filter) using [RedisBloom](https://redisbloom.io) |
| `get-server-time.js` | Get the time from the Redis server | | `get-server-time.js` | Get the time from the Redis server |
| `hyperloglog.js` | Showing use of Hyperloglog commands [PFADD, PFCOUNT and PFMERGE](https://redis.io/commands/?group=hyperloglog) |
| `lua-multi-incr.js` | Define a custom lua script that allows you to perform INCRBY on multiple keys | | `lua-multi-incr.js` | Define a custom lua script that allows you to perform INCRBY on multiple keys |
| `managing-json.js` | Store, retrieve and manipulate JSON data atomically with [RedisJSON](https://redisjson.io/) | | `managing-json.js` | Store, retrieve and manipulate JSON data atomically with [RedisJSON](https://redisjson.io/) |
| `search-hashes.js` | Uses [RediSearch](https://redisearch.io) to index and search data in hashes | | `search-hashes.js` | Uses [RediSearch](https://redisearch.io) to index and search data in hashes |

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examples/hyperloglog.js Normal file
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// 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);
}
await client.quit();