local function declares a name. return sends a value back.

Goal

Write greet and a units total.

local function greet(name)
  return "Hello, " .. name
end
print(greet("Nairobi"))

local function total(units, price)
  return units * price
end
print(total(12, 40))

local function label(city)
  city = city or "Nairobi"
  return city .. " kiosk"
end
print(label())
print(label("Kisumu"))

local function add(a, b)
  return a + b
end
print(add(8, 5))