Re: Local Variables

[Elias Barrionovo <elias.tandel@...>]

On Thu, Aug 7, 2014 at 6:40 PM, Mason Mackaman <masondeanm@aol.com> wrote:
> I see, when I change the variables from the libraries (or should I say modules, I really don’t know when to use what) I’ve written to local, they don’t carry over. So I guess that’s the only time you use globals then?


A module can return a value, just like a function (in fact, a module
*is* a function), so it's idiomatic for the value to return a table
with what it wants to export. A silly example:

-- file double.lua
local double(x) return x*2 end  -- local, only this module can see this
return {double = double}  -- returning a table that exports the double function


-- file main.lua
local double = require 'double'
print(double.double(4))

-- 
NI!

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