Mastering Swift while and repeat-while Loops: A Comprehensive Guide

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Mastering Swift while and repeat-while Loops: A Comprehensive Guide

Swift is a powerful and modern programming language which offers many features for developers. One of the most important concepts in Swift programming is looping and control flow. In this article, we are going to explore the two types of loop statements in Swift – the while loop and the repeat-while loop. We will discuss how to use them in your code, as well as the differences between the two.

The while loop is one of the basic looping statements in Swift. It allows you to execute a set of statements until a certain condition is met. The syntax for a while loop is as follows: 

while condition {
   // statements
}

In the above syntax, the condition is a boolean expression that is evaluated before each iteration of the loop. If the condition is true, the statements inside the loop are executed. If the condition is false, the loop is terminated.

Let’s look at an example of a while loop in action. The following code will print out the numbers from 1 to 10: 

var number = 1
while number <= 10 {
    print(number)
    number += 1
}

The above code will print out the numbers from 1 to 10, one number per line. The first line initializes a variable called number and sets it to 1. The while loop then checks if the value of number is less than or equal to 10. If it is, the statements inside the loop are executed. In this case, the statement inside the loop is a print statement that prints out the value of the number variable. After the statement is executed, the number variable is incremented by one. This process is repeated until the condition evaluates to false.

The repeat-while loop is another type of loop in Swift. It is similar to the while loop, except that the condition is evaluated at the end of the loop instead of at the beginning. The syntax for a repeat-while loop is as follows: 

repeat {
   // statements
} while condition

In the above syntax, the condition is a boolean expression that is evaluated after each iteration of the loop. If the condition is true, the loop is executed again. If the condition is false, the loop is terminated.

Let’s look at an example of a repeat-while loop in action. The following code will print out the numbers from 1 to 10: 

var number = 1
repeat {
    print(number)
    number += 1
} while number <= 10

The above code will print out the numbers from 1 to 10, one number per line. The first line initializes a variable called number and sets it to 1. The repeat-while loop then executes the statements inside the loop. In this case, the statement inside the loop is a print statement that prints out the value of the number variable. After the statement is executed, the number variable is incremented by one. The condition is then evaluated. If the condition is true, the loop is executed again. If the condition is false, the loop is terminated.

To summarize, the while loop and the repeat-while loop are two looping statements in Swift. The while loop evaluates the condition at the beginning of the loop and terminates when the condition is false. The repeat-while loop evaluates the condition at the end of the loop and terminates when the condition is false. Both loops can be used to execute a set of statements until a certain condition is met.

We hope this article has helped you understand the basics of while and repeat-while loops in Swift. If you have any questions or feedback, please feel free to leave a comment. Happy coding!

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