Go: ZScore command added (#2945)

* Go: ZScore command added

Signed-off-by: Prateek Kumar <[email protected]>

go/api/base_client.go

@@ -1783,3 +1783,38 @@ func (client *baseClient) XDel(key string, ids []string) (int64, error) {
 	}
 	return handleIntResponse(result)
 }
+
+// Returns the score of `member` in the sorted set stored at `key`.
+//
+// See [valkey.io] for details.
+//
+// Parameters:
+//
+//	key - The key of the sorted set.
+//	member - The member whose score is to be retrieved.
+//
+// Return value:
+//
+//	The score of the member. If `member` does not exist in the sorted set, `nil` is returned.
+//	If `key` does not exist, `nil` is returned.
+//
+// Example:
+//
+//	membersScores := map[string]float64{
+//		"one":   1.0,
+//		"two":   2.0,
+//		"three": 3.0,
+//	}
+//
+//	zAddResult, err := client.ZAdd("key1", membersScores)
+//	zScoreResult, err := client.ZScore("key1", "one")
+//	//fmt.Println(zScoreResult.Value()) // Value: 1.0
+//
+// [valkey.io]: https://valkey.io/commands/zscore/
+func (client *baseClient) ZScore(key string, member string) (Result[float64], error) {
+	result, err := client.executeCommand(C.ZScore, []string{key, member})
+	if err != nil {
+		return CreateNilFloat64Result(), err
+	}
+	return handleFloatOrNilResponse(result)
+}

go/api/sorted_set_commands.go

@@ -378,5 +378,7 @@ type SortedSetCommands interface {
 	// [valkey.io]: https://valkey.io/commands/zrevrank/
 	ZRevRankWithScore(key string, member string) (Result[int64], Result[float64], error)
 
+	ZScore(key string, member string) (Result[float64], error)
+
 	ZCount(key string, rangeOptions *options.ZCountRange) (int64, error)
 }

go/integTest/shared_commands_test.go

@@ -4877,6 +4877,45 @@ func (suite *GlideTestSuite) Test_XAdd_XLen_XTrim() {
 	})
 }
 
+func (suite *GlideTestSuite) Test_ZScore() {
+	suite.runWithDefaultClients(func(client api.BaseClient) {
+		key1 := uuid.NewString()
+		key2 := uuid.NewString()
+		t := suite.T()
+
+		membersScores := map[string]float64{
+			"one":   1.0,
+			"two":   2.0,
+			"three": 3.0,
+		}
+
+		zAddResult, err := client.ZAdd(key1, membersScores)
+		assert.NoError(t, err)
+		assert.Equal(t, zAddResult, int64(3))
+
+		zScoreResult, err := client.ZScore(key1, "one")
+		assert.NoError(t, err)
+		assert.Equal(t, zScoreResult.Value(), float64(1.0))
+
+		zScoreResult, err = client.ZScore(key1, "non_existing_member")
+		assert.NoError(t, err)
+		assert.True(t, zScoreResult.IsNil())
+
+		zScoreResult, err = client.ZScore("non_existing_key", "non_existing_member")
+		assert.NoError(t, err)
+		assert.True(t, zScoreResult.IsNil())
+
+		// Key exists, but it is not a set
+		setResult, err := client.Set(key2, "bar")
+		assert.NoError(t, err)
+		assert.Equal(t, setResult, "OK")
+
+		_, err = client.ZScore(key2, "one")
+		assert.NotNil(t, err)
+		assert.IsType(t, &api.RequestError{}, err)
+	})
+}
+
 func (suite *GlideTestSuite) TestZCount() {
 	suite.runWithDefaultClients(func(client api.BaseClient) {
 		key1 := uuid.NewString()