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local Object = require "Object"
local Point = Object:extends() -- creating new class by extending basic class
function Point:new (x, y) -- defining function called by constructor for newly created class
self.x = x -- instance created by constructor is `self`
self.y = y
end -- no returns needed
Point.NUMBER = 10 -- setting some global values for class
function Point:__tostring () -- metamethod used with `tostring()`
return "Point<" .. self.x .. ", " .. self.y .. ">"
end
local a = Point(3, 2) -- create new instance by calling class
print(tostring(a))
assert(a:is(Point)) -- you can also check if object is instance of class
assert(a:is(Object)) -- use `is()` method for it
local Foo = Point:extends() -- you can extend whatever class you want
function Foo:new (str, x, y)
Foo.__super.new(self, x, y) -- call super constructor first
self.str = str -- do whatever else is left to be done
end
function Foo:__tostring () -- metamethods are not inherited
return "Foo(" .. self.str .. ")<" .. self.x .. ", " .. self.y .. ">"
end
local b = Foo("lorem", 7, -1)
print(tostring(b))
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