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From: rbowman <bowman@montana.com>
Newsgroups: comp.lang.javascript
Subject: Re: comma operator?
Date: Tue, 1 Jan 2019 17:09:11 -0700
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On 01/01/2019 04:24 PM, Luca wrote:
> I think I get it now. It's a simple use of "let" to declare two
> variables to be used within the module. The first variable is also
> initialized as an empty list.
>
> Sorry for the confusion

Comma separated lists of variables have been around since FORTRAN if not 
before. It saved work when you were using punch cards but it can be 
confusing and lead to errors.

let a, b, c, d = 3;

may or may not do what the programmer intended. I've always preferred 
explicit, one variable per line, declarations but that's just me.