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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: object giving errors
Date: Thu, 12 Dec 2019 10:11:54 +0100
Organization: PointedEars Software (PES)
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Xref: csiph.com comp.lang.javascript:37955

Andrew Poulos wrote:

> Why is it that when I do this
> 
> function pos() {
>    return { "top": 10, "left": l20 };
> }
> 
> or this
> 
> function pos() {
>    let o = { "top": 10, "left": l20 };
>    return o;
> }
> 
> I get "Uncaught ReferenceError: l20 is not defined".
> 
> But when I do it like this
> 
> function pos() {
>    let o = {};
>    o.top = 10;
>    o.left = 120;
>    return o;
> }
> 
> I get no errors?

The first code snippet contains a reference to the variable with identifier 
(in words) “‘U+006C Latin Small Letter L’, followed by ‘U+0032 Digit Two’, 
followed by ‘U+0030 Digit Zero’”; the second one contains the decimal 
numeric literal (in words) “one hundred twenty” (i.e. “U+0031 Digit One”, 
followed by “U+0032 Digit Two”, followed by “U+0030 Digit Zero”).

Using an *unambiguous* *monospace* font like “DejaVu Sans Mono” (free 
software), “Bitstream Vera Mono” (Open Source) or “Consolas” (proprietary; 
de Groot/Microsoft), and an editor supporting code completion, like 
Atom(.io), and a code checker like ESLint(.org), for software development, 
helps to avoid such problems.

-- 
PointedEars
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