Added sorted set example. (#2005)

* Added sorted set example.

* Update sorted-set.js

Co-authored-by: Leibale Eidelman <leibale1998@gmail.com>

examples/README.md

@@ -15,6 +15,7 @@ This folder contains example scripts showing how to use Node Redis in different
 | `search-hashes.js`          | Uses [RediSearch](https://redisearch.io) to index and search data in hashes                                                                         |
 | `search-json.js`            | Uses [RediSearch](https://redisearch.io/) and [RedisJSON](https://redisjson.io/) to index and search JSON data                                      |
 | `set-scan.js`               | An example script that shows how to use the SSCAN iterator functionality                                                                            |
+| `sorted-set.js`             | Add members with scores to a Sorted Set and retrieve them using the ZSCAN iteractor functionality                                                   |
 | `stream-producer.js`        | Adds entries to a [Redis Stream](https://redis.io/topics/streams-intro) using the `XADD` command                                                    |
 | `stream-consumer.js`        | Reads entries from a [Redis Stream](https://redis.io/topics/streams-intro) using the blocking `XREAD` command                                       |
 | `time-series.js`            | Create, populate and query timeseries data with [Redis Timeseries](https://redistimeseries.io)                                                      |

examples/sorted-set.js

@@ -0,0 +1,35 @@
+// Add several values with their scores to a Sorted Set,
+// then retrieve them all using ZSCAN.
+
+import { createClient } from 'redis';
+
+async function addToSortedSet() {
+  const client = createClient();
+  await client.connect();
+
+  await client.zAdd('mysortedset', [
+    {
+      score: 99,
+      value: 'Ninety Nine'
+    },
+    {
+      score: 100,
+      value: 'One Hundred'
+    },
+    {
+      score: 101,
+      value: 'One Hundred and One'
+    }
+  ]);
+
+  // Get all of the values/scores from the sorted set using
+  // the scan approach:
+  // https://redis.io/commands/zscan
+  for await (const memberWithScore of client.zScanIterator('mysortedset')) {
+    console.log(memberWithScore);
+  }
+  
+  await client.quit();
+}
+
+addToSortedSet();