CODEWITHSUNDEEP
arraysswiftdictionary
user2924482
user2924482

Reputation: 9140

How to add an array to dictionary?

I am trying to add an array to dictionary but I am getting this error:

Cannot convert value of type '[[String : String]]' to expected dictionary value type 'Array

Here is my implementation:

let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray:Array = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:Array] = ["MainDictionary": myArray]

I get the error on this line let mainDict:[String:Array] = ["MainDictionary": myArray]

Any of you may know why I am getting this error or way around this?

Upvotes: 0

Views: 120

Answers (3)

Tomas Jablonskis
Tomas Jablonskis

Reputation: 4376

Do not use Array keyword for defining type of dictionary. Try following to fix your issues:

let dicContent: [String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = [[String: String]]()
myArray.append(dicContent)
let mainDict: [String: [[String: String]]] = ["MainDictionary": myArray]

Tho, types of variables can be implicitly defined in this case, so your code can be simplified to following:

let dicContent = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
let mainDict = ["MainDictionary": [dicContent]]

Upvotes: 2

Teja Nandamuri
Teja Nandamuri

Reputation: 11201

The error says, you have declared the mainDict as 

let mainDict:[String:Array]

but did not specify what does the Array holds. Either you can try one of the following to fix the issue.

try:

let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:[[String: String]]] = ["MainDictionary": myArray]

or if you want to use the Array keyword, you can do it like:

let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = Array<[String: String]>()
myArray.append(dicContent)
let mainDict:[String:Array<[String:String]>] = ["MainDictionary": myArray]

or simply

let mainDict = ["MainDictionary": myArray]

When you use the Array Keyword, you need to specify what type of objects that array will hold within the < ... >

Upvotes: 2

Tayyab Faran
Tayyab Faran

Reputation: 36

let dicContent:[String: String] = ["Alabama": "Montgomery", 
"Alaska":"Juneau","Arizona":"Phoenix"]
var myArray  = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:Any] = ["MainDictionary": myArray]
let getArrayBack = mainDict["MainDictionary"] as! [[String:String]]

Upvotes: 1

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