Method call in Lua

In Lua, you can call a method in a class by using the colon operator, which is a syntactic sugar for passing the object as the first argument to the method. Here's an example:

-- Define a class
Person = {
    name = "",
    age = 0
}
function Person:new(name, age)

    local obj = {}

    setmetatable(obj, self)

    self.__index = self

    obj.name = name or ""

    obj.age = age or 0

    return obj

end
function Person:sayHi()

    print("Hi, my name is " .. self.name .. " and I am " .. self.age .. " years old.")

end
-- Create an instance of the class

local bob = Person:new("Bob", 30)
-- Call the sayHi method

bob:sayHi() -- Output: Hi, my name is Bob and I am 30 years old.

As you can see, we defined a Person class with a new constructor method and a sayHi instance method. To call the sayHi method on an instance of the Person class, we use the colon operator (:) followed by the name of the method. This automatically passes the bob object as the first argument to the method, so inside the method we can access its properties by using self.