Your First Class

class … end — a blueprint, same idea as Swift/Python

You've built classes before: Swift's class/struct, Python's class Walker:. Ruby's version looks like everything else in this course — no braces, no colon, just class opening the block and end closing it:

class Walker
end

That alone is a complete (if useless) class. Walker.new would already work, handing back an empty instance. The interesting part is what you put inside.