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How to format dates with an ordinal suffix using NumberFormatter's ordinalStyle

Swift version: 5.1

Paul Hudson    @twostraws   

As of iOS 9.0, Apple introduced a simple way to make ordinal style numbers, which is a fancy way of saying 1st, 2nd, 3rd or 100th – the kind of numbers you normally write for dates, for example. This uses the NumberFormatterStyle.ordinal style of writing numbers with NumberFormatter, like this:

let formatter = NumberFormatter()
formatter.numberStyle = .ordinal
let first = formatter.string(from: 1)
let second = formatter.string(from: 2)
let tenth = formatter.string(from: 10)
let oneThousandAndFirst = formatter.string(from: 1001)
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