Cannot convert value of type Substring to expected argument type String - Swift 4

Question

Trying to get substring of String and append it to array of Strings:

var stringToSplit = "TEST TEXT"
var s = [String]()
let subStr = anotherString[0 ..< 6]
s.append(subStr) // <---- HERE I GET THE ERROR

Answer 1

As @Leo Dabus mentioned, you need to initialize a new String with your substring:

Change:

s.append(subStr)

To:

s.append(String(subStr))

Answer 2

my two cents for serro in different context. I was trying to get an array of "String" splitting a string. "split" gives back "Substring", for efficiency reason (as per Swift.org litre).

So I ended up doing:

let buffer = "one,two,three"
let rows = buffer.split(separator:",")

let realStrings = rows.map { subString -> String in
    return String(subString)
}

print(realStrings)

Ape can help someone else.