What's the process for transforming a numeric String into an array of Integers using Swift?

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1. Split the numeric string into an array of characters using the characters property.
2. Use the map function on the array of characters to convert each character (which is a Character type) into an integer (which is an Int type) using the toInt function (or Int's initializer in Swift 5.0+).
3. Collect the resulting array of integers using the flatMap function (or compactMap in Swift 5.0+).

Here's some Swift code that demonstrates this process:

let numericString = "12345"
let arrayOfIntegers = numericString.characters.map { $0.toInt() }.flatMap { $0 }
// arrayOfIntegers is [1, 2, 3, 4, 5]

Note that the toInt() method has been deprecated since Facebook's removal of the method from their library, so in Swift 5.0+ you can instead use the Int() initializer to attempt string-to-integer conversion, like this:

let numericString = "12345"
let arrayOfIntegers = numericString.map { Int(String($0)) }.compactMap { $0 }
// arrayOfIntegers is [1, 2, 3, 4, 5]