Re: local-ity of undef parameter

[David Given <dg@...>]

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spir wrote:
[...]
> output = function(thing, level)
[...]
> Is here 'level' local in the case it was not defined inthe calling expression?

Parameters are always local; if a value isn't specified when your
function was called, then it'll be initialised to nil. It's the
*declaration in the function* that matters, not how your function was
called.

[...]
>    if not level then local level = 1

In fact, this won't do what you expect. 'local' defines variables in the
enclosing scope --- which here is the then...end block.

do
  local var = 1
  if true then
    local var = 2
    print(var) -- outputs 2!
  end
  print(var) -- outputs 1!
end

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