Add fn.checkMembership

functions.js

@@ -700,7 +700,14 @@ const functions = {
 			console.error(err);
 		});
 	},
-	
+	checkMembership(client, userId) {
+		if (!client.memberships) throw new Error("Membership Collection Not Exist");
+		if (client.memberships.has(userId)) {
+			return true;
+		} else {
+			return false;
+		}
+	},
 	autoresponses: { // Specific responses for certain keywords in sent messages
 		checkForAll(messageContent) {
 			let responses = [];