Trouble accessing dictionary item in Swift 2.0 - swift

Question

I'm experienced in Obj-C, but fairly new to Swift. I have a simple function that takes a Set and a Dictionary as parameters:
func buildSource(dataToParse:Set<String>, lookupData:Dictionary<String,AnyObject>) {
for item in dataToParse {
for dict in lookupData {
let nameID = dict["name"] // compile error
}
}
}
The passed in parameter lookupData is a dictionary containing nested dictionaries. I know that each of these dictionaries contains a key called name but when I try to access that key using the following syntax:
let nameID = dict["name"]
I get the following comile error:
Type '(String, AnyObject)' has no subscript members
If I know that a key exists, how do I access it? Thanks!

Answer 1

import Foundation
func buildSource(dataToParse:Set<String>, lookupData:Dictionary<String,AnyObject>)->[AnyObject] {
var ret: Array<AnyObject> = []
for item in dataToParse {
for (key, value) in lookupData {
if key == item {
ret.append(value)
}
}
}
return ret
}
let set = Set(["alfa","beta","gama"])
var data: Dictionary<String,AnyObject> = [:]
data["alfa"] = NSNumber(integer: 1)
data["beta"] = NSDate()
data["theta"] = NSString(string: "some string")
let find = buildSource(set, lookupData: data)
dump(find)
/* prints
▿ 2 elements
- [0]: 28 Nov 2015 18:02
▿ [1]: 1 #0
▿ NSNumber: 1
▿ NSValue: 1
- NSObject: 1
*/
in your code
for dict in lookupData {
let nameID = dict["name"] // compile error
}
dict is not a dictionary, but (key, value) tuple!

Answer 2

Update:
get value from lookupData with "name" as the key
downcast to a dictionary with as? [String:AnyObject]
iterate over dataToParse
use the String from dataToParse to access the nested dictionary.
func buildSource(dataToParse:Set<String>, lookupData:[String:AnyObject]) {
guard let dict = lookupData["name"] as? [String:AnyObject] else {
return
}
for item in dataToParse {
let value = dict[item]
}
}
More possible solutions:
If lookupData is an array of dictionaries:
func buildSource(dataToParse:Set<String>, lookupData:[[String:AnyObject]]) {
for item in dataToParse { // String
for dict in lookupData { // dict
let nameID = dict["name"] // value
}
}
}
If lookupData is a nested dictionary :
func buildSource(dataToParse:Set<String>, lookupData:[String:[String:AnyObject]]) {
for item in dataToParse {
guard let dict = lookupData[item] else {
continue
}
guard let nameID = dict["name"] else {
continue
}
}
}
If lookupData is definitely [String:AnyObject] and it's value might be another [String:AnyObject], but it might also not be.
func buildSource(dataToParse:Set<String>, lookupData:[String:AnyObject]) {
for item in dataToParse {
guard let dict = lookupData[item] as? [String:AnyObject] else {
continue
}
guard let nameID = dict["name"] else {
continue
}
}
}