Swift Playground #1 adding components to Date using operator overloading.

Dates.playground

import Foundation

extension Int{
    var day: (Int, Calendar.Component) {
        return (self, .day)
    }
    
    var month: (Int, Calendar.Component) {
        return (self, .month)
    }
    
    var year: (Int, Calendar.Component) {
        return (self, .year)
    }
}

////
public func + (date: Date, tuple: (value: Int, unit: Calendar.Component)) -> Date {
    return Calendar.current.date(byAdding: tuple.unit, value: tuple.value, to: date)!
}

public func - (date: Date, tuple: (value: Int, unit: Calendar.Component))  -> Date {
    return Calendar.current.date(byAdding: tuple.unit, value: (-tuple.value), to: date)!
}

public func += (date: inout Date, tuple: (value: Int, unit: Calendar.Component)) {
    date = Calendar.current.date(byAdding: tuple.unit, value: tuple.value, to: date)!
}

public func -= (date: inout Date, tuple: (value: Int, unit: Calendar.Component)) {
    date = Calendar.current.date(byAdding: tuple.unit, value: (-tuple.value), to: date)!
}


var tomorrow = Date() + 1.year
tomorrow += 1.day

var yesterday = Date() - 1.day
yesterday -= 1.year

This is the worst code I've ever seen