Hello and welcome! In this unit, we will delve into an intriguing topic — varargs in Scala. This feature enables us to pass a variable number of arguments to a function, in a manner similar to a shopping list of varying lengths. We will discuss varargs, their syntax, rules in Scala, and how they operate within Scala functions. An exciting journey awaits us, so let's get started!

Let's understand what varargs are and why we might need them. Imagine you want to develop a greet function that allows you to greet any number of people. How can you solve this task?

Well, you could create a method with many overloaded versions like so:

The problem with this approach is that if someone wanted to greet up to 100 people, you'd have to write 100 implementations!

Another option is to accept an array or list as an argument:

Although this option works, there is a better way that combines the two approaches described above, called varargs. Varargs allow passing any number of arguments to a function, resembling an array without the need to explicitly create one. Here's how we can use varargs in Scala: