Added zscore command in node.

node/src/BaseClient.ts

@@ -54,6 +54,7 @@ import {
     createZadd,
     createZcard,
     createZrem,
+    createZscore,
 } from "./Commands";
 import {
     ClosingError,
@@ -1062,6 +1063,20 @@ export class BaseClient {
         return this.createWritePromise(createZcard(key));
     }
 
+    /** Returns the score of `member` in the sorted set stored at `key`.
+     * See https://redis.io/commands/zscore/ for more details.
+     *
+     * @param key - The key of the sorted set.
+     * @param member - The member whose score is to be retrieved.
+     * @returns The score of the member.
+     * If `member` does not exist in the sorted set, null is returned.
+     * If `key` does not exist, null is returned.
+     * If `key` holds a value that is not a sorted set, an error is returned.
+     */
+    public zscore(key: string, member: string): Promise<number | null> {
+        return this.createWritePromise(createZscore(key, member));
+    }
+
     private readonly MAP_READ_FROM_STRATEGY: Record<
         ReadFrom,
         connection_request.ReadFrom

node/src/Commands.ts

@@ -760,3 +760,10 @@ export function createZrem(
 export function createZcard(key: string): redis_request.Command {
     return createCommand(RequestType.Zcard, [key]);
 }
+
+/**
+ * @internal
+ */
+export function createZscore(key: string, member: string): redis_request.Command {
+    return createCommand(RequestType.ZScore, [key, member]);
+}

node/src/Transaction.ts

@@ -57,6 +57,7 @@ import {
     createZadd,
     createZcard,
     createZrem,
+    createZscore,
 } from "./Commands";
 import { redis_request } from "./ProtobufMessage";
 
@@ -821,6 +822,21 @@ export class BaseTransaction<T extends BaseTransaction<T>> {
         return this.addAndReturn(createZcard(key));
     }
 
+    /** Returns the score of `member` in the sorted set stored at `key`.
+     * See https://redis.io/commands/zscore/ for more details.
+     *
+     * @param key - The key of the sorted set.
+     * @param member - The member whose score is to be retrieved.
+     *
+     * Command Response - The score of the member.
+     * If `member` does not exist in the sorted set, null is returned.
+     * If `key` does not exist, null is returned.
+     * If `key` holds a value that is not a sorted set, an error is returned.
+     */
+    public zscore(key: string, member: string) {
+        this.commands.push(createZscore(key, member));
+    }
+
     /** Executes a single command, without checking inputs. Every part of the command, including subcommands,
      *  should be added as a separate value in args.
      *

node/tests/SharedTests.ts

@@ -1389,6 +1389,30 @@ export function runBaseTests<Context>(config: {
         },
         config.timeout
     );
+
+
+    it.each([ProtocolVersion.RESP2, ProtocolVersion.RESP3])(
+        `zscore test_%p`,
+        async (protocol) => {
+            await runTest(async (client: BaseClient) => {
+                const key1 = uuidv4();
+                const key2 = uuidv4();
+                const membersScores = { one: 1, two: 2, three: 3 };
+                expect(await client.zadd(key1, membersScores)).toEqual(3);
+                expect(await client.zscore(key1, "one")).toEqual(1.0);
+                expect(await client.zscore(key1, "nonExistingMember")).toEqual(
+                    null
+                );
+                expect(
+                    await client.zscore("nonExistingKey", "nonExistingMember")
+                ).toEqual(null);
+
+                expect(await client.set(key2, "foo")).toEqual("OK");
+                await expect(client.zscore(key2, "foo")).rejects.toThrow();
+            }, protocol);
+        },
+        config.timeout
+    );
 }
 
 export function runCommonTests<Context>(config: {

node/tests/TestUtilities.ts

@@ -95,7 +95,8 @@ export function transactionTest(
         .zadd(key8, { member1: 1, member2: 2 })
         .zaddIncr(key8, "member2", 1)
         .zrem(key8, ["member1"])
-        .zcard(key8);
+        .zcard(key8)
+        .zscore(key8, "member2");
     return [
         "OK",
         null,
@@ -127,6 +128,7 @@ export function transactionTest(
         3,
         1,
         1,
+        3.0,
     ];
 }