Add generic type cast for ids and strings (#478)

livekit/types.go

@@ -14,80 +14,36 @@
 
 package livekit
 
-// ----------------------------------------------------------------
-
 type TrackID string
-
-func StringsAsTrackIDs(trackIDs []string) []TrackID {
-	asTrackID := make([]TrackID, 0, len(trackIDs))
-	for _, trackID := range trackIDs {
-		asTrackID = append(asTrackID, TrackID(trackID))
-	}
-
-	return asTrackID
-}
-
-// ----------------------------------------------------------------
-
 type ParticipantID string
-
-func ParticipantIDsAsStrings(ids []ParticipantID) []string {
-	strs := make([]string, 0, len(ids))
-	for _, id := range ids {
-		strs = append(strs, string(id))
-	}
-	return strs
-}
-
-// ----------------------------------------------------------------
-
 type ParticipantIdentity string
 type ParticipantName string
-
 type RoomID string
-
-// ----------------------------------------------------------------
-
 type RoomName string
-
-func RoomNamesAsStrings(roomNames []RoomName) []string {
-	asString := make([]string, 0, len(roomNames))
-	for _, roomName := range roomNames {
-		asString = append(asString, string(roomName))
-	}
-
-	return asString
-}
-
-func StringsAsRoomNames(roomNames []string) []RoomName {
-	asRoomName := make([]RoomName, 0, len(roomNames))
-	for _, roomName := range roomNames {
-		asRoomName = append(asRoomName, RoomName(roomName))
-	}
-
-	return asRoomName
-}
-
-// ----------------------------------------------------------------
-
 type ConnectionID string
-
-// ----------------------------------------------------------------
-
 type NodeID string
+type ParticipantKey string
+
+type stringTypes interface {
+	ParticipantID | RoomID | TrackID | ParticipantIdentity | ParticipantName | RoomName | ConnectionID | NodeID | ParticipantKey
+}
 
-func NodeIDsAsStrings(ids []NodeID) []string {
+func IDsAsStrings[T stringTypes](ids []T) []string {
 	strs := make([]string, 0, len(ids))
 	for _, id := range ids {
 		strs = append(strs, string(id))
 	}
 	return strs
 }
 
-// ----------------------------------------------------------------
-type ParticipantKey string
+func StringsAsIDs[T stringTypes](ids []string) []T {
+	asID := make([]T, 0, len(ids))
+	for _, id := range ids {
+		asID = append(asID, T(id))
+	}
 
-// ----------------------------------------------------------------
+	return asID
+}
 
 type Guid interface {
 	TrackID | ParticipantID | RoomID