Swift Concatenated Integers

concatenated-integers.swift

// In reference to:
// https://www.reddit.com/r/dailyprogrammer/comments/69y21t/20170508_challenge_314_easy_concatenated_integers/

let input = """
79 82 34 83 69
420 34 19 71 341
17 32 91 7 46
"""

func pad (_ strToPad: String, maxLength: Int) -> String {
    var str = strToPad
    while str.count < maxLength {
        str = str + String(str.characters.first!)
    }
    return str
}

func arrayToInt (_ arr: [String]) -> Int? {
    var outString = ""
    for i in arr {
        outString += i
    }
    return Int(outString)
}

var lines = input.split(separator: "\n")
for line in lines {
    let lineArray = line.split(separator: " ")
    let lineArrayAsStrings = lineArray.map { String($0) }
    var maxLength = 0
    for i in lineArrayAsStrings {
        if i.count > maxLength { maxLength = i.count }
    }
    
    let max = lineArrayAsStrings.sorted() { pad($1, maxLength: maxLength) < pad($0, maxLength: maxLength) }
    let min = lineArrayAsStrings.sorted() { pad($1, maxLength: maxLength) > pad($0, maxLength: maxLength) }
    
    print("\(arrayToInt(min)!) \(arrayToInt(max)!)")
}