Hello, budding developer! In this unit, we're exploring function parameters in Scala. Function parameters are the inputs given to functions. For instance, in println("Hello, world!"), "Hello, world!" is a parameter you are passing to the println() function. Parameters help functions adapt to specific pieces of information, making them incredibly versatile.

We'll start by writing a function that takes a single parameter. This simple function will greet a user:

In this case, name is a parameter of the type String that our greetUser function uses. We use the def keyword to define a function and string interpolation with s" to include the variable in the string.

We can also create a function with multiple parameters. For example, a function could calculate a rectangle's area by accepting its length and width as parameters.