Swift 4 Recipes: Hundreds of Useful Hand-picked Code Snippets

© Yanis Zafirópulos 2019

Yanis ZafirópulosSwift 4 Recipeshttps://doi.org/10.1007/978-1-4842-4182-0_4

4. Loops

Yanis Zafirópulos¹ 

(1)

Granada, Spain

 

In computer programming, a loop is a control flow statement for specifying iteration, which allows code to be executed repeatedly. In this chapter, we’ll look into the different ways that you can use them in Swift.

4.1 Write a for loop

Problem

I want to write a for loop.

Solution

Let’s write a simple loop.

for x in 0...5 {

      print("x = \(x)")

}

If you don’t need the current value from the sequence, then you can just ignore it by replacing the variable name with an underscore.

for _ in 0..<3 {

      print("Hello world!")

}

How It Works

You may use a for-in loop to iterate over a sequence, for example, a range of ...