Retrieve JSON Object and populate array Swift

Question

I have a json object of this structure:

[
    {
        "id": 1,
        "seat_no": 6
    },
    {
        "id": 2,
        "seat_no": 27
    }
]

The main challenge is that I need to get the seat_no and add that to an int array which I will be using later on:

func getReserved() -> [Int] {
  var reservedSeatsJSON : JSON = JSON()
  var seats = Int()
  var reservedSeats = [Int]()

  for item in reservedSeatsJSON.array! {
     seats = item["seat_no"].int!
     reservedSeats.append(seats)
     self.reservedSeatsLabel.text = "Reserved(\(reservedSeatsJSON.array!.count))"
  }
  return reservedSeats      
}

Each time I run this, the reservedSeats returns empty. The main idea here is that I need to populate an int array in a for loop and return the populated array outside the for loop

After your loop finishes, how come your reservedSeats array is empty? — Shamas S
– Shamas S, Commented Jan 19, 2018 at 2:31
That is the mystery I am trying to solve. Maybe I'm doing something wrong or there is some thing wrong with the logic — user1514567
– user1514567, Commented Jan 19, 2018 at 2:37
Add a statement printing out seats in the loop. I think you'll be surprised by the output. — Gary Makin
– Gary Makin, Commented Jan 19, 2018 at 2:39
I edited the code. The print statement does produce 6, 27 but the reservedSeats is still [] — user1514567
– user1514567, Commented Jan 19, 2018 at 2:45
There's no print statement in the code you posted. Where are you seeing 6 and 27 being printed? — rmaddy
– rmaddy, Commented Jan 19, 2018 at 4:26

Jaydeep Vora · Accepted Answer · 2018-01-19 04:21:15Z

1

First check is reservedSeatsJSON json contains actual JSON?

if it contains actual JSON then do as like below. short and simple way.

func getReserved() -> [Int] {
     var reservedSeatsJSON : JSON = JSON()
     self.reservedSeatsLabel.text = "Reserved(\(reservedSeatsJSON.array.count))" 

     return reservedSeatsJSON.arrayValue.map { $0["seat_no"].intValue }
}

answered Jan 19, 2018 at 4:21

Jaydeep Vora

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3 Comments

user1514567 Over a year ago

The format of the JSON I receive is exactly as it is in my question. So I need to access the seat_no in another function. I tried your solution but it returns an empty array.

Syyam Noor Over a year ago

@user1514567 did you find any solution?

Jaydeep Vora Over a year ago

is this sample json in your array is complete or partial?

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