ordinal.swift

func ordinal(forNumber: Int) -> String {
        let tens = (number / 10) % 10
        let ones = number % 10
        
        let suffix: String
        
        switch (tens, ones) {
        case (1, _):
            suffix = "th"
        case (_, 1):
            suffix = "st"
        case (_, 2):
            suffix = "nd"
        case (_, 3):
            suffix = "rd"
        default:
            suffix = "th"
        }
        
        return "\(number)\(suffix)"
    }

Thanks, this was useful!