[Vuejs]-How to use IF / ELSE in a method of Vue

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Thanks to @CherryDT, I was able to realize I needed to use includes as part of the if statement. The code should look as follows

    methods: {
        joinRoom(room) {
            if (!this.$store.state.rooms.joinedRooms.includes(room)) {
            this.$store.dispatch(RoomTypes.JOIN_ROOM, room);
            this.$store.dispatch(RoomTypes.CURRENT_ROOM, room);
            this.$emit('onClose')
            }
            else if (this.$store.state.rooms.joinedRooms.includes(room)) {
                this.$store.dispatch(RoomTypes.CURRENT_ROOM, room);
                this.$emit('onClose')
            }
        }
    },

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