Re: question on local vs nonlocal
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- Subject: Re: question on local vs nonlocal
- From: Ahmed Charles <acharles@...>
- Date: 2020年5月15日 12:27:45 +0000
> On May 14, 2020, at 6:24 PM, Sean Conner <sean@conman.org> wrote:
>
> So why not use '_ENV.' in place of 'global'? It's already supported by
> Lua, and it makes it *very* easy to locate the use of global variables.
The useful part of the feature is that simply typing ‘x = 1’ is an error. Using _ENV only benefits readers. Being forced into deciding whether to use global or local and where, is useful for writing (or at least, it forces a change in the process of writing). Programming language design is as much about what are invalid programs as it is about what are valid ones.
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