I'm trying to create Ball class and have some methods in the class but I can't find the right syntax
Tried reading this: https://www.lua.org/pil/16.html
MovingObj = {}
function MovingObj:new(o)
return o
end
ball = MovingObj:new {}
MovingObj.test = function (self)
print ("Test!")
end
ball:test()
Error message I get: attempt to call method 'test' (a nil value)
o is just a empty table, you dont apply a metatable to it which would allow access to the functions of MovingObj
You can correct this by applying a metatable during your new function:
MovingObj = {}
function MovingObj.new(o)
o = o or {}
local meta = {
__index = MovingObj -- when o does not have a given index check MovingObj for that index.
}
return setmetatable(o, meta) -- return o with the new metatable applied.
end
ball = MovingObj.new({type = "ball"})
function MovingObj:test()
print ("Test! I'm a " .. self.type)
end
ball:test()
It is also not necessary to use the : syntax for this new function, we are not using the self variable.
