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 number into a string and then iterating over each digit, but it doesn't work:
var number = "123456"
var array = [Int]()
for digit in number {
array.append(digit)
}
Any ideas?
We can also extend the StringProtocol and create a computed property:
edit/update: Xcode 11.5 • Swift 5.2
extension StringProtocol {
var digits: [Int] { compactMap(\.wholeNumberValue) }
}
let string = "123456"
let digits = string.digits // [1, 2, 3, 4, 5, 6]
extension LosslessStringConvertible {
var string: String { .init(self) }
}
extension Numeric where Self: LosslessStringConvertible {
var digits: [Int] { string.digits }
}
let integer = 123
let integerDigits = integer.digits // [1, 2, 3]
let double = 12.34
let doubleDigits = double.digits // // [1, 2, 3, 4]
In Swift 5 now we can use the new Character property wholeNumberValue
let string = "123456"
let digits = string.compactMap{ $0.wholeNumberValue } // [1, 2, 3, 4, 5, 6]