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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Keen eyes
Date: Sun, 17 Jan 2016 00:37:00 -0700
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Xref: csiph.com comp.lang.python:101834

On Jan 17, 2016 12:16 AM, "Steven D'Aprano" <steve@pearwood.info> wrote:
>
> On Sun, 17 Jan 2016 10:25 am, jonas.thornvall@gmail.com wrote:
>
> > double use of j in two different functions
>
> Are you using a global variable called "j" as a loop variable? That sounds
> like a terrible idea.
>
> You should use local variables. Then a function with a local variable j
> cannot possibly effect another function with a local variable also called
> j.
>
> Wait... is somebody going to tell me that Javascript defaults to global
> variables inside functions?

Technically it defaults to non local. The var statement allocates a
variable within the current scope. Otherwise it searches up the chain of
parent scopes for a matching variable, terminating at the global scope.

I believe Lua also works this way.