Don't know how to access array data inside dictionary [: []], Swift, iOS

Question

I am stuck with this guy [: []]. As you can see, currently inside function I am using [0] to access value, but with this type of solution I can only access first element of array. How can I access all values? I tried with for in loop, but couldn't solve it...

Thanks in advance!

func tripServices(tripId: String) {
    networkManager.getBookedTripsDetails(endpoint: "/v1/bookings/\(tripId)", tripId: tripId) { [unowned self] (safeTripsDetails) in
        DispatchQueue.main.async {
            self.bookedTripDetails = self.createScreenData(from: safeTripsDetails!, singleTrip: self.singleTrip!)
            self.tableView.reloadData()
        }
    }
}

func createScreenData(from data: [String: [BookingService]], singleTrip: BookedTripsForView) -> [DetailsAboutServiceForView] {
    
    return data.map{ ( data) -> DetailsAboutServiceForView in
        return DetailsAboutServiceForView(id: singleTrip.id,
                                          destination: data.value[0].destination,
                                          tripStatus: data.value[0].status,
                                          tripStartTime: data.value[0].startDate,
                                          serviceName: data.value[0].serviceName,
                                          serviceId: data.value[0].serviceId)
    }
}

Answer 1

If you have a dictionary of arrays, and you want your output to be a single array containing all of the arrays combined into one array of a different type, there are various ways you could do that.

Rather than trying to work out your data types, I banged out an example using simple structs:

//Source struct
struct Person {
    let name: String
    let age: Int
}

//Output struct
struct Employee {
    let name: String
    let age: Int
    let salary: Int?
}

let dictOfArrays = ["key1": [Person(name: "Bob", age: 36),
                             Person(name: "Felecia", age: 27),
                             Person(name: "Armin", age: 19)],
                    
                    "key2": [Person(name: "Janet", age: 57),
                             Person(name: "John", age: 12),
                             Person(name: "Karen", age: 43)]
]

//Create an empty array for the output
var output = [Employee]()

//Loop through the dictionaries
dictOfArrays.forEach { (_, values) in
    values.forEach { person in
        //Only those who are >=18 can be employees
        if person.age >= 18 {
            output.append( Employee(name: person.name, age: person.age, salary: nil))
        }
    }
}

//Logs the resulting array of Employee structs.
output.forEach { print($0) }

Edit:

As pointed out by Alexander in his comment, you can do the above in one statement without creating an array var and appending to it using a combination of flatmap, filter, and map:

let output = dictOfArrays.flatMap { (_, values) in
    values.filter { $0.age >= 18 }
    .map { person in
        Employee(name: person.name, age: person.age, salary: nil)
    }
}