& Lesson 3: Repeating things, simply

& Computers are good at repeating things:

repeat 4 {
  forward! (100)
  right! (0.25)
}

& let's take this line by line
& 5: repeat 4 {
&    ^^^^^^     `repeat` is NOT a function, but a "special form"
&           ^   this tells Ludus how many times to repeat a thing
&             ^ this "curly brace" lets you group lines of code together
&               we call this group a "block"

& 6:   forward! (100)
&    ^^               as a matter of style, we indent lines in a block
&      ^^^^^^^^       we recognize this

& 7:   right! (0.25)
&                     we recognize this, too
&                     but it has to be on its own line!
&                     (we could use a `;` instead of a newline)

& 8: }
&    ^ We need to close the block we opened on line 5
&      What happens if we forget it?

& What happens if you change the number of times it repeats?
& -- the distance the turtle goes forward?
& -- the amount we turn right?