Re: Local and Global Variables

[Philipp Janda <siffiejoe@...>]

Hi!

Am 27.04.2013 20:41 schröbte Dirk Laurie:
> 2013/4/27 Steve Litt <slitt@troubleshooters.com>:
> > LOL, the day I use 200 variables in one function, you should shoot me
> > and put me out of my misery. Long before I got to 200, just for the
> > wellbeing of my brain, I'd arrange them in data structures, which for
> > the purposes of Lua means tables suitably nested.
>
> Not in a function, no, but in a module's main file, dead easy.
>
> Suppose you belong to the cache-system-library-functions brigade,
> then the system libraries alone can account for well over 100 slots.

Some data points (top five) from a member of the 
cache-system-library-functions brigade:

locals for `./lua-microscope/tests/microscope1.test.lua`:	100   (11k, 
test script, doesn't cache globals!)
locals for `./lua/vbanim/src/vbanim.lua`:	95   (13k, script, doesn't 
cache globals!)
locals for `./lua-microscope/src/microscope.lua`:	85   (21k, module, 
returns a single function, rest is local)
locals for `./lua/iterators/tests/iterators.test.lua`:	80   (2.2k, test 
script, doesn't cache globals!, many for-loops)
locals for `./lua-annotate/src/annotate/check.lua`:	67   (24k, module)

None of my modules so far caches more than 22 globals.

Philipp

#!/usr/bin/lua

local bci = require( "bci" )

assert( arg[ 1 ], "Lua filename required!" )
for _,fname in ipairs( arg ) do
  local f = assert( loadfile( fname ) )
  local h = bci.getheader( f )
  print( "locals for `"..fname.."`:", h.locals )
end