[Solved] how to filter current array using another array

Question

You can filter an array of Hotels to only keep hotels that contain a RoomPrice whose roomType property is present in an array of RoomFilter using two nested contains(where:) calls inside your filter, one searching Hotel.prices and the other one searching roomFilters to see if there is at least a single common element between the two arrays.

let filteredHotels = hotels.filter({ hotel in
    hotel.prices?.contains(where: { room in roomFilters.contains(where: {$0.roomType == room.roomType})}) ?? false
})

Some general advice: you should name your types using singular form, since a single Hotel instance represents 1 Hotel, not several ones, same for RoomPrices. It also doesn’t make sense to mark all properties as optional and mutable. Declare everything as immutable and optional unless you have a good reason not to do so.

Accepted Answer

You can filter an array of Hotels to only keep hotels that contain a RoomPrice whose roomType property is present in an array of RoomFilter using two nested contains(where:) calls inside your filter, one searching Hotel.prices and the other one searching roomFilters to see if there is at least a single common element between the two arrays.

let filteredHotels = hotels.filter({ hotel in
    hotel.prices?.contains(where: { room in roomFilters.contains(where: {$0.roomType == room.roomType})}) ?? false
})

Some general advice: you should name your types using singular form, since a single Hotel instance represents 1 Hotel, not several ones, same for RoomPrices. It also doesn’t make sense to mark all properties as optional and mutable. Declare everything as immutable and optional unless you have a good reason not to do so.