Lua Quick Start Guide

Local variables

The local variables of any function can be inspected with the debug.getlocal function. This function takes two arguments: first a stack level (the same as debug.getinfo), and then a variable index. Variables are indexed in the order they appear. If either argument is out of range, the debug.getlocal function will return nil. Otherwise, it will return the name and value of the current variable.

For example, the following code prints the local variables of its calling function:

function DebugLocals()  local info = debug.getinfo(2, "n")  print ("Local variables of: " .. info.name)  local idx = 1  while true do    local name, val = debug.getlocal(2, idx)    if name == nil then      break    end    print (" " .. name .. " = " .. tostring(val)) idx ...