[Fizzlemizz]

function addonTable:doSomething()

It's a matter of what scope you want the function/variable to have

• Added to global table, All addons have acess to it.
• Added to "namespace" table, the current addon has access in all its .lua files
• local at the root level of a .lua file - code below it in that .lua file has access
• local inside a code chunk (if, for, anything with an "end" statement) - only code inside the chunk after the local declaration has access.

This is also effected by load sequence (.toc order). Eg. you can't use a function added to the namespace table before the file it is declared in has been loaded.

.toc

file1.lua
file2.lua

file1.lua

local addon, ns = ...
ns:RunFunc()

file2.lua

local addon, ns = ...
function ns:RunFunc()
    print("Are we here yet?")
end

Errors because file1 is loaded before file2 has a chance to "create" the function.

Consider your .lua files as functions in their own right

BlizzardSpace["NameOfTheAddon"] = {}
function file1.lua("NameOfTheAddon", BlizzardSpace["NameOfTheAddon"])
    local addon, ns = ... -- your code goes here
    -- etc. etc.
end
function file2.lua("NameOfTheAddon", BlizzardSpace["NameOfTheAddon"])
    local addon, ns = ... -- your code goes here
    -- etc. etc.
end

(generalised representation)