& Lesson 5: Passing arguments

& Recall our last function:
& fn box! () -> repeat 4 { fd! (100); rt! (0.25) }

& This function can only draw a box with a side of `100`

& To make our function more flexible, we can add an argument:

fn box! (size) -> repeat 4 {
&        ^^^^                This is our size parameter
	fd! (size)
&      ^^^^                  Which we use here: the parameter is a name.
&                            This name only lasts as long as our function.
	rt! (0.25)
}

& How do you call out new `box!` function?








& A note:
& * a *parameter* is the name for a thing we _don't yet know the value of_
& * an *argument* is the name for a parameter _when it is given a concrete value_

& fn box! (size) ...
&          ^^^^ This is a parameter: in the function definition
& box! (50)
&       ^^      This is an argument: in the function call

& It's a subtle difference, and not especially important
& Plenty of programmers use these words interchangeably
& I just wanted to alert you to these words, their difference, their use.
& In all Ludus documentation, we'll be using them correctly.