let restaurant = {
    name: 'Red Lobster',
    guestCapacity: 75,
    guestCount: 0,
    checkAvailability: function (partySize) {
        let seatsLeft = this.guestCapacity - this.guestCount

        return partySize <= seatsLeft
    },
    seatParty: function (guests) {
        this.guestCount = this.guestCount + guests
        console.log(`seating ${guests}, total is now ${this.guestCount}/${this.guestCapacity}.`)
    },
    removeParty: function(guests) {
        this.guestCount = this.guestCount - guests
        console.log(`${guests} leaving, total is now ${this.guestCount}/${this.guestCapacity}.`)
    }
}

// seatParty

// removeParty

restaurant.seatParty(72)
console.log(restaurant.checkAvailability(4))
restaurant.removeParty(5)
console.log(restaurant.checkAvailability(4))