Swift Programming: The Big Nerd Ranch Guide

6 Loops

Loops help with tasks that are repetitive in nature. They execute a set of code repeatedly, either for a given number of iterations or as long as a defined condition is met. Loops can save you from writing tedious and repetitive code, so take note! You will be using them a lot in your development.

In this chapter, you will use two sorts of loops:

• the for loop

• the while loop

The for loop is ideal for iterating over the specific elements of an instance or collection of instances when the number of iterations to perform is either known or easy to derive. The while loop, on the other hand, is well suited for tasks that execute repeatedly as long as a certain condition is met. Each of these has variations. Let’s start ...