# Calling "functions" is sending a "message" (right) to an object (left)
# ↓ object  ↓ message
"Hi ho, Io" print

# Object creation is by cloning and modifying root "Object" object
# Convention appears to be that classes start with capitals
Vehicle := Object clone

# ":=" creates a "slot" (which can be a value or a function?), whereas "=" assigns to existing ones
Vehicle description := "A description of our vehicle"
# So this would fail because the slot doesn't exist - we'll repeat it at the end to stop it crashing our program too early!
# Vehicle another_field = "This won't work"

# Fetching values is just calling the function (but we need an extra "print" to print to stdout)
Vehicle description print

# In addition to the slot we created, there is a default slot called "type"
# (and presumably some default messages, because slotNames apparently isn't a slot!)
Vehicle slotNames print
Vehicle type print
Object type print

Vehicle another_field = "This won't work"