Until in Swift

In Swift, the until keyword is not used as it is not a reserved keyword in the language. However, the while keyword can be used in combination with a not operator to achieve the same functionality as until in other programming languages.

Here's an example of how to use while and not to achieve an "until" loop in Swift:

var i = 0
while !(i == 5) {

    print("i is not 5 yet, it is currently \(i)")

    i += 1

}
// Output:

// i is not 5 yet, it is currently 0

// i is not 5 yet, it is currently 1

// i is not 5 yet, it is currently 2

// i is not 5 yet, it is currently 3

// i is not 5 yet, it is currently 4

In the example above, we initialize i to 0 and then enter a while loop. The condition for the loop is !(i == 5), which means "execute the loop while i is not equal to 5". Within the loop, we print out the current value of i and increment it by 1. The loop continues until i reaches 5, at which point the condition is no longer true and the loop ends.