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@published Property Wrapper.
import Combine
class Event {
@Published var calendarYear = 2020 // initial value
let event = Event() // new instance of Event
.sink { newCalendar in
print("year is \(newCalendar)")
// Here the value of calendarYear is changed
// At this change the print statement will execute
event.calendarYear = 2021
year is 2020
year is 2021
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