Should I create a manual default function, or an __index metamethod?

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#1

Hey, I have tool class named functions in a metatable, and I have a default function, which I’ll fire if the tool class name isn’t in the metatable, which would be best for such case?

if (not ToolClassFunction) then return Metatable:DefaultFunction() end;
or
return Metatable[ToolClassName](Metatable, ...);

How I’ve set up the metatable:

local Metatable = {};
Metatable.__index = function(self, ...)
print('Default');
return
end

Btw I’ve forgot how to do __index functions :skull: so it prints, but still errors (attempt to call a nil value), unless I do:
__index = function() return function() print('xd') end end

which I don’t know if I should do lol.

Edit: Alright I can’t wait :skull:, I’ll just go with the former, so I can set __index to self, if anyone says the latter is better I’ll change it lol.

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#2

I’d personally probably just have the __index metamethod reference the table with your function definitions (I think you’re already doing that.) But if you’re curious, here’s how you could get the alternative working.

local Metatable = {}

function Metatable.someTool()
print'yeaaah'
end

function Metatable.default()
print'default yessir'
end

setmetatable(Metatable, {
__index = function(t, k)
    local memberFunction = rawget(Metatable, k)

    if memberFunction then
        return memberFunction
    else
        return Metatable.default
    end
end;
})

Metatable.thisDoesntExist() --> default function gets called
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#3

Well I don’t know if rawget() would work with ‘:’ functions (table[string](table, ...)), but I ended up just using the if statement, thanks though :+1:

Edit: For anyone curious to what I was doing, here the code:

local ClassNameFunction = ClientInstanceService[ToolClassInstance:GetAttribute('ClassName')];
return not ClassNameFunction and ClientInstanceService:DefaultActiavteInstance(ToolClassInstance) or ClassNameFunction(ClientInstanceService, ToolClassInstance);
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