Diffrence between : and . when calling functions in a module?

[n_cy]

For example

local myModule =  {} 

function myModule:Func() -- From my understanding, this passes the self automatically

end

function myModule.Func()

end

return myModule

Why do when I do this the first parameter is nil?

--Script
self.Ability(Arg1) 

--Inside module script 
function doThis(Arg1)
print(Arg1) -- Outputs as nil

end

[anon81993163]

Sugar syntaxing:

First arg of modulescript function disappears

a:b(c) is sugar syntax for a.b(a, c). a.b is sugar syntax for a["b"]. So you need to call with a colon or pass module as the first argument. Don’t define all module functions with the colon, this sugar syntax makes passing the function as an argument to another function a pain.