[Sasky]

Originally Posted by Tar000un I also saw with a :, instead the dot.

In Lua, using the colon ( : ) instead of the dot makes a variable "self" available in the function.

For example:

local foo = {}
foo.val = 1
 
function foo:bar()
    d(self.val) --Prints 1
end

When you fully define the tables, it's not as critical, since you can simply use the table name instead:

function foo.bar()
    d(foo.val) --Prints 1
end

Where it's most useful is object-oriented programming style, where you have the same function with different objects and need self to differentiate between them.