Loops

Now, let’s talk about another common control structure: loops. Loops are essential for developers because they allow us to repeat a block of code multiple times. Without loops, it would be difficult to execute the same code repeatedly (although we will explore alternative approaches to achieve repetition without loops in later chapters).

The for-each loop

One of the most useful types of loops in Kotlin is the for-each loop. This loop allows us to iterate over strings, data structures, and any object that has an iterator. We will learn more about iterators in Chapter 4, Getting Familiar with Behavioral Patterns. For now, let’s see an example of using the for-each loop with a simple string:

for (c in "Word") {
    println(c)
}

When you run this code, it will display the following output:

> W
> o
> r
> d

The for-each loop can also be used with other types of data structures we have discussed, such as lists, sets, and...