Formatter
Formatting numbers in Swift | Swift by Sundell
Exploring some of the lesser-known, built-in Formatter types | Swift by Sundell
How to use FormatStyle to restrict TextField input in SwiftUI
Formatting dates in the user’s locale using DateFormatter in Swift – Donny Wals
Formatting dates in Swift using Date.FormatStyle on iOS 15 – Donny Wals
Pitch: an Official Style Guide and Formatter for Swift - Evolution / Pitches - Swift Forums