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This is how I am giving a passenger a seat
shuttle.seats[i].name = PASSENGERS[i].name; // i is the index you know
shuttle.seats[i].house = PASSENGERS[i].house;
but it gives me the error
Uncaught TypeError: Cannot set property 'name' of null
How can I fix it?
The problem is caused when shuttle.seats[i] is equal to null as you're trying to set the name property of it to PASSENGERS[i]. In other words, there is no name property (or pretty much any other property) for an object whose value is null.
You probably should do something like
shuttle.seats[i] = passenger;
where shuttle.seats[i] is that seat that you wanna give to a passenger and passenger is the passenger you wanna give them this seat.
passenger is the passenger you wanna give them the seat" NOT just the name of the passenger, but rather an object that encapsulates all the information you need for this particular passenger. It doesn't have to be literally set to passenger. passenger here is just a place holder. You should change that to the appropriate object whatever the way you're accessing it with.