Split String into groups with specific length

Question

How can I split the given String in Swift into groups with given length, reading from right to left?

For example, I have string 123456789 a

Answer 1

There's probably a more elegant solution, but this works:

func splitedString(string: String, length: Int) -> [String] {
    let string = Array(string.characters)
    let firstGroupLength = string.count % length
    var result: [String] = []
    var group = ""

    if firstGroupLength > 0 {
        for i in 0..