How to split an Int to its individual digits?

Question

I am trying to split an Int into its individual digits, e.g. 3489 to 3 4 8 9, and then I want to put the digits in an Int array.

I have already tried putting the num

Answer 1

this code works:

var number = "123456"
var array = number.utf8.map{Int(($0 as UInt8)) - 48}

this might be slower:

var array = number.characters.map{Int(String($0))!}

and if your number is less or equal than Int.max which is 9223372036854775807 here is the fastest variant (and if your number>Int.max you can split your long string that represents your number into 18-digit groups to make this variant work on large strings)

var array2 = [Int]()
var i = Int(number)!
while i > 0 {array2.append(i%10); i/=10}
array2 = array2.reverse()