Correct syntax for reading value in nested array?

Question

If anyone could help i'm having trouble with the syntax. What is the correct way to read an Int in an

Array -> Dict -> Array -> Dict -> Array -> [0]

I'm new to Swift 3 and am having trouble extracting the variable. Any help would be apreciated. I've tried something along the lines of:

let sen = dict["senzu"] as? [[String:Any]]
  let sen1 = dfa?[0][0]["green"] as? Any

Answer 1

To make it more clear, I divided:

Array -> Dict -> Array -> Dict -> Array -> [0]

to separated levels, assuming that the last array is level 05 and the first array is level 01, as follows:

// Array of Ints
var arrayLevel_05 = [1, 2, 3, 4]

// Dict of arrays of ints
var dictLevel_04: [String: [Int]] = ["myArray01": arrayLevel_05]

// Array of dicts of arrays of ints
var arrayLevel_03:[[String: [Int]]] = [dictLevel_04]

// Dict of arrays of dicts of arrays of ints
var dictLevel_02: [String: [[String: [Int]]]] = ["myArray02": arrayLevel_03]

// Array of dict of arrays of dicts of arrays of ints
var arrayLevel_01:[[String : [[String : [Int]]]]] = [dictLevel_02]

So, for getting the values of ints in arrayLevel_05 :

let one = arrayLevel_01[0]["myArray02"]?[0]["myArray01"]?[0]
let tow = arrayLevel_01[0]["myArray02"]?[0]["myArray01"]?[1]
let three = arrayLevel_01[0]["myArray02"]?[0]["myArray01"]?[2]

Note that they are optionals because you are reading values from dictionaries, if you are pretty sure that you will always get a value, you can replace the ? with ! (force unwrapping) as follows:

let one = arrayLevel_01[0]["myArray02"]![0]["myArray01"]![0]
let tow = arrayLevel_01[0]["myArray02"]![0]["myArray01"]![1]
let three = arrayLevel_01[0]["myArray02"]![0]["myArray01"]![2]

Or follow the optional binding approach:

if let arrayLevel03 = arrayLevel_01[0]["myArray02"], let arrayLevel05 = arrayLevel03[0]["myArray01"] {
    let one = arrayLevel05[0]   // 1
    let tow = arrayLevel05[1]   // 2
    let three = arrayLevel05[2] // 3
}

For more information about what are optionals, check Apple Documentation (Optional Section).

Hope this helped.