Re: Say No to global-by-default

[Sean Conner <sean@...>]

It was thus said that the Great Gregg Reynolds once stated:
> On Wed, Jul 4, 2018, 3:53 PM Egor Skriptunoff <egor.skriptunoff@gmail.com>
> wrote:
> 
> >
> > I do not hate globals :-)
> > I'm trying to solve the problem "the compiler silently ignores all
> > variable name typos".
> > It's the expectation of many programmers that a compiler should check for
> > misspelled identifiers and warn the user at compile time.
> >
> 
> Now I'm completely confused. I never heard of a compiler that could do
> that. What does "misspelled identifier" mean to a compiler? I must be
> missing your point, sorry.

[spc]lucy:/tmp>more a.c

int foo(int bar)
{
  int baz = 5;
  return baa + bar;
}
[spc]lucy:/tmp>gcc a.c
a.c: In function oo':
a.c:5: error: `baa' undeclared (first use in this function)
a.c:5: error: (Each undeclared identifier is reported only once
a.c:5: error: for each function it appears in.)

  But in C, you have to declare every variable upfront.  In Lua:

function foo(bar)
  local baz = 5
  return baa + bar
end

'baa' is treated as a global variable who's value is nil (and thus in *this*
case you get an error, but this won't happen in all cases).

  -spc