Variables & Everything is an Object

No let, no var, no const

Swift makes you pick: let for a constant, var for something that changes. Python drops the keyword but keeps the assignment. Ruby goes even further — there's no keyword at all. You just write a name, =, and a value:

walker_name = "Priya"
walk_price_cents = 2400

That's a local variable, full stop. Ruby has no let/const distinction baked into the syntax — every plain assignment can be reassigned later. (You'll meet freeze in a later module for the rare case you truly want to lock a value down.)