Add new entries to a "complex" dictionary - swift

Question

I have a more "complex" dictionary that I am trying to add new entries to. The dictionary code is as follows:
var users: [[String:Any]] = [
[
"firstName": "Bill",
"lastName": "G"
]
]
I tried adding a new entry with this code:
users[1]["firstName"] = "Steve"
users[1]["lastName"] = "J"
print(users) // fatal error: Array index out of range
But receive "fatal error: Array index out of range" I looked at several examples but all seem to deal with simpler dictionaries. What am I missing?

Answer 1

You need to first create an instance of the dictionary and add it to the array, you can then add key:value pairs to it:
var users: [[String:Any]] = [
[
"firstName": "Bill",
"lastName": "G"
]
]
users.append([String:Any]())
users[1]["firstName"] = "Steve"
users[1]["lastName"] = "J"
print(users) // [["firstName": "Bill", "lastName": "G"], ["firstName": "Steve", "lastName": "J"]]
You can even do it in a single statement like this:
users.append(["firstName": "Steve", "lastName": "J"])
If you don't append a new element on to the array then when you try to reference the next index it will be out of range.

Answer 2

This works in a playground
var users: [[String:Any]] = [
[
"firstName": "Bill",
"lastName": "G"
]
]
users[0]["firstName"] = "Steve"
users[0]["lastName"] = "J"
users
Using index 0, not 1 like you were using which causes the index out of bounds error
Or the more dynamic approach
var users = [[String:AnyObject]]()
let personA = ["Steve":"J"]
let personB = ["Foo":"Z"]
users.append(personA)
users.append(personB)
users