While in Swift

In Swift, while is a loop statement. You use it when you need to repeat a set of statements a few times, but you don't know how many times you need to execute them beforehand. The syntax for while loop in Swift is as follows:

while condition {
   // statements to execute while condition is true
}

The condition is an expression that is evaluated before each iteration of the loop. If the condition is true, the statements inside the loop will be executed. This will continue until the condition becomes false. Here's an example of using while in Swift.

var i = 0
while i < 5 {
    print(i)
    i += 1
}

In this example, the while loop will execute until i is less than 5. Inside the loop, print(i) will output the value of i. Then i is incremented by 1 each time the loop iterates. Here's the output of this code:

0

1

2

3

4

You can also use while loop with a Boolean value. Here's an example:

var isHappy = true
while isHappy {
    print("I'm happy!")
    isHappy = false // set the condition to false to exit the loop
}

In this example, as long as the isHappy variable is true, the statement inside the loop will be executed. Here, it will print "I'm happy!" once. The loop will exit afterward because we set isHappy to false.