Do you use
require "name"
or
local name = require "name"
Also, do you explicitly declare system modules as local variables? E.g.
local io = require "io"
Please explain your choice.
Programming in Lua 2ed says "if she prefers to use a shorter name for a module, she can set a local name for it" and nothing about local m = require "mod"
being faster than require "mod"
. If there's no difference I'd rather use the cleaner require "mod"
declaration and wouldn't bother writing declarations for pre-loaded system modules.
Either of them works. Storing it in a local will not change the fact that the module may have registered global functions.