Add element to a complex nested collection in swift - ios

Question

I'm stuck practicing collections in Swift. Actually, I storing data from an online JSON source into dictionaries/arrays. I'm trying to add a new element to the following collection:
testDict1: Dictionary<String,Dictionary<Int,Dictionary<String, AnyObject>>>
I initialized it with the following elements (it could have been an empty array):
testDict1 = ["fireMagic":[
0:["name":"Basic attack","damage":100],
1:["name":"Super attack","damage":200, "lvlReq": 20],
2:["name":"Mega attack","damage":400, "lvlReq": 40]]]
I would like to "update" data within testDict1 (replace and add a new row if needed) from another array such as:
testDict1 = ["fireMagic":[
0:["name":"Basic attack","damage":100],
1:["name":"Super attack","damage":200, "lvlReq": 20],
2:["name":"Mega attack","damage":400, "lvlReq": 40]
3:["name":"Insane attack","damage":1000, "lvlReq": 60]]]
QUESTION 1
How can I append the element below to testDict1:
3:["name":"Insane attack","damage":1000, "lvlReq": 60] //with "FireMagic" as a key.
I'm facing different errors and I can't make it work. I'm sure it must be more complex than the ways I tried and you may have the solution to end my pain :)
QUESTION 2
How do I do if I need to add other powers such as "WaterMagic" with the same structure as "FireMagic" in testDict1.
testDict1 = ["fireMagic":[
0:["name":"Basic attack","damage":100],
1:["...":"...","...":"..."]],
["waterMagic":[
0:["name":"Basic attack","damage":100]]
Thank you in advance for your help in my learning quest!

Answer 1

Q1:
Unsafe:
testDict1["fireMagic"]![3] = ["name":"Insane attack","damage":1000, "lvlReq": 60]
Safe:
if let _ = testDict1["fireMagic"] {
testDict1["fireMagic"]![3] = ["name":"Insane attack","damage":1000, "lvlReq": 60]
}
Safe and simple (thanks #dfri):
testDict1["fireMagic"]?[3] = ["name":"Insane attack","damage":1000, "lvlReq": 60]
Q2:
testDict1["waterMagic"] = [0:["name":"Test attack","damage":100]]
But I would suggest using arrays, enums and structs instead of dictionaries, it's much simpler to handle, and it's also more safe:
enum MagicType {
case Water
case Fire
}
struct Magic {
let magic: MagicType
let name: String
let damage: Int
let lvlReq: Int?
}
Create an array of objects:
var fireMagics = [Magic(magic: .Fire, name: "Basic attack", damage: 100, lvlReq: nil), Magic(magic: .Fire, name: "Super attack", damage: 200, lvlReq: 20), Magic(magic: .Fire, name: "Mega attack", damage: 100, lvlReq: 40)]
Access the objects in the array by index:
fireMagics[0]
fireMagics[1]
fireMagics[2]
etc.
Add an object to the array:
fireMagics.append(Magic(magic: .Fire, name: "Insane attack", damage: 1000, lvlReq: 60))
Create a different type of Magic object:
var waterMagics = [Magic(magic: .Water, name: "Test attack", damage: 100, lvlReq: nil)]