include Rectangle from "./model.luck"

public function factorial(number)
    local result = 1

    # for - start from 0 to number - 1
    for i in number
        result *= (i + 1)
    end

    result
end

function recursive()
    factorial(10) == 3628800
end

function with_return()
    local factor = 0

    if factor == 0
        true
        return
    end

    false
end

function first_class_function()
    local f = factorial

    f(10) == 3628800
end

function instance_first_class_function()
    local rect = Rectangle(10, 20)
    local a = rect.area

    a() == 200
end