Swift 2.1 New Way to Initialize String Array?

Question

In my old Swift 1 code I could do this:

class MyArrayLists {

    var myarray = [String, String]

    init(){

        myarray.append("First String", "Second String.")
    }

}

Now after getting around to opening my code and trying to convert it to 2.1, it's telling me I can't do this anymore. Next to the declaration we see:

Expected member name or constructor call

Next to the append statement I see:

Cannot invoke append with argument of type (String, String)

What changed?

what is my array supposed to be? An array of strings, an array of a 2-string-tuples? — luk2302
– luk2302, Commented Nov 23, 2015 at 19:58
Hey, it seems like you want to use a Dictionary, in that case replace var myarray = [String, String] to var myarray = [String: String]() To add you could use myarray["DictID"] = "DictValue" — 0xC0A1
– 0xC0A1, Commented Nov 23, 2015 at 20:01
No I need two strings in an array, it's not a key and value sort of thing it's two values. — Nathan McKaskle
– Nathan McKaskle, Commented Nov 23, 2015 at 20:08

JAL · Accepted Answer · 2015-11-23 19:59:36Z

2

With Swift 2 you explicitly have to declare the type of object in the array in parenthesis:

class MyArrayLists {

    var myarray: [(String, String)] = [(String, String)]()

    init(){

        self.myarray.append(("First String", "Second String."))
    }

}

answered Nov 23, 2015 at 19:59

JAL

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Eric Aya · Accepted Answer · 2015-11-23 20:11:15Z

2

The compiler used to infer that

[String, String]

was actually an array of tuples:

[(String, String)]

and that appending a pair of values with

myarray.append("First String", "Second String.")

was sytactic sugar for what actually was happening behind the scene:

myarray.append(("First String", "Second String."))

But now this automatic conversion has been deprecated.

The solution is to declare the proper type, and to append a proper tuple:

var myarray = [(String, String)]()

myarray.append(("First String", "Second String."))

edited Nov 23, 2015 at 20:11

answered Nov 23, 2015 at 19:59

Eric Aya

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