[Solved] How to get minimum & maximum value in a NSString/String array?

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@user3815344’s answer works, however you can simplify it by using minElement and maxElement to retrieve the minimum and maximum values. For example:

let arr = ["55a", "95a", "66", "25", "88b", "#"]
let numbers: [Int] = arr.reduce([]) {
    if let num = "".join($1.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet)).toInt() {
        return $0 + [num]
    }

    return $0
}

minElement(numbers) // 25
maxElement(numbers) // 95

Updated for Swift 2: toInt has been replaced by a failable initialiser on Int that takes a String and minElement and maxElement have been replaced by protocol extensions:

let arr = ["55a", "95a", "66", "25", "88b", "#"]
let numbers: [Int] = arr.reduce([]) {
    if let num = Int("".join($1.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet))) {
        return $0 + [num]
    }

    return $0
}

let min: Int? = numbers.minElement() // 25
let max: Int? = numbers.maxElement() // 95

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solved How to get minimum & maximum value in a NSString/String array?