CODEWITHSUNDEEP
arraysobjectswift
user3067506
user3067506

Reputation: 23

Swift: Cant append Items to Array with two values

So my code is like this (Playground)

import Foundation

public class Node {}

var test: Node = Node()
var arrayTest = [Int, Node]()

arrayTest.append(2, test)

Error xCode shows @ append Line: Accessing members of protocol type value 'Int' is unimplemented

But if I change the second array value from "Node" to "String" everything works fine. If I delete "Int, " so that its only a Node Array it works too. What am I missing? Why doesn't it work like that?

Upvotes: 2

Views: 1755

Answers (3)

mike663
mike663

Reputation: 623

Appending a tuple to an array worked as expected when my tuple had 2 elements. When I jumped to a tuple with 4 elements, then I got the "Accessing members..." message.

The straightforward approach didn't work.

myArray.append(tupleItem1, tupleItem2, tupleItem3, tupleItem4) // ! Accessing members of protocol type value ...

The suggested workaround didn't work.

myArray.append((tupleItem1, tupleItem2, tupleItem3, tupleItem4)) // ! Missing argument for parameter #2 in call

What did work was a two-step append.

let myElement = (tupleItem1, tupleItem2, tupleItem3, tupleItem4)
myArray.append(myElement)

Upvotes: 1

maksimov
maksimov

Reputation: 5811

And if otherwise you're building a dictionary, then it will look something like this:

var arrayTest = Dictionary<Int, Node>()
arrayTest[2] = test

Upvotes: 0

Antonio
Antonio

Reputation: 72760

If your goal is to store (Int, Node) tuples in the array, then you should enclose the tuple in parenthesis, either when specifying the array type and when using append:

var test: Node = Node()
var arrayTest = [(Int, Node)]()
//               ^         ^

arrayTest.append((2, test))
//               ^       ^

Upvotes: 2

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