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devel / comp.lang.javascript / JSLint: "Wrap a ternary expression in parens, ..."

SubjectAuthor
* JSLint: "Wrap a ternary expression in parens, ..."emf
+* Re: JSLint: "Wrap a ternary expression in parens, ..."Stefan Ram
|`- Re: JSLint: "Wrap a ternary expression in parens, ..."emf
`* Re: JSLint: "Wrap a ternary expression in parens, ..."Michael Haufe (TNO)
 `* Re: JSLint: "Wrap a ternary expression in parens, ..."emf
  +* Re: JSLint: "Wrap a ternary expression in parens, ..."Stefan Ram
  |+* Re: JSLint: "Wrap a ternary expression in parens, ..."Stefan Ram
  ||`- Re: JSLint: "Wrap a ternary expression in parens, ..."emf
  |`- Re: JSLint: "Wrap a ternary expression in parens, ..."Thomas 'PointedEars' Lahn
  `* Re: JSLint: "Wrap a ternary expression in parens, ..."Michael Haufe (TNO)
   `- Re: JSLint: "Wrap a ternary expression in parens, ..."emf

1
JSLint: "Wrap a ternary expression in parens, ..."

<tapv73$1pkf$1@gioia.aioe.org>

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From: emfril@gmail.com (emf)
Newsgroups: comp.lang.javascript
Subject: JSLint: "Wrap a ternary expression in parens, ..."
Date: Thu, 14 Jul 2022 16:44:18 -0400
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 by: emf - Thu, 14 Jul 2022 20:44 UTC

Hi.

JSLint now does not like this code (that it used to find OK), saying

"Wrap a ternary expression in parens, with a line break after
the left paren."

=================
orb = (orb0Btn.checked)
? 0
: (orb5Btn.checked)
? 5
: (orb10Btn.checked)
? 10
: (orb15Btn.checked)
? 15
: 20;
=================

What is now the correct syntax for the ternary expression?

Thanks,

Eustace
--
Natal Transits Calculator
https://emf.neocities.org/nt/nataltransits2.html

Re: JSLint: "Wrap a ternary expression in parens, ..."

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: 15 Jul 2022 06:27:13 GMT
Organization: Stefan Ram
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 by: Stefan Ram - Fri, 15 Jul 2022 06:27 UTC

emf <emfril@gmail.com> writes:
>What is now the correct syntax for the ternary expression?

IIRC, JSLint does not check syntax but its authors idea of style.

The syntax for the conditional expression is

ConditionalExpression[In, Yield, Await] :
ShortCircuitExpression[?In, ?Yield, ?Await]
ShortCircuitExpression[?In, ?Yield, ?Await] ? AssignmentExpression[+In, ?Yield, ?Await] :
AssignmentExpression[?In, ?Yield, ?Await]

, so, you can just write, for example, "0?1:1?2:3"
(which would evaluate to 2).

Re: JSLint: "Wrap a ternary expression in parens, ..."

<ff42c0ad-120d-4a19-9a04-e4b47f2b0a92n@googlegroups.com>

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Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
From: tno@thenewobjective.com (Michael Haufe (TNO))
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 by: Michael Haufe (TNO) - Fri, 15 Jul 2022 15:40 UTC

On Thursday, July 14, 2022 at 3:44:28 PM UTC-5, emf wrote:
> Hi.
>
> JSLint now does not like this code (that it used to find OK), saying
>
> "Wrap a ternary expression in parens, with a line break after
> the left paren."
>
> =================
> orb = (orb0Btn.checked)
> ? 0
> : (orb5Btn.checked)
> ? 5
> : (orb10Btn.checked)
> ? 10
> : (orb15Btn.checked)
> ? 15
> : 20;
> =================
>
> What is now the correct syntax for the ternary expression?

It's just a jslint setting. You can turn that off I'm pretty sure.

I think it wants:

(
p ? truePart : (
p ? truePart : falsePart
)
)

I think this is because nested ternaries can be a little hard to read if you don't format them properly.

I prefer ESLint

Re: JSLint: "Wrap a ternary expression in parens, ..."

<tasb35$svu$1@gioia.aioe.org>

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From: emfril@gmail.com (emf)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: Fri, 15 Jul 2022 14:19:16 -0400
Organization: Aioe.org NNTP Server
Message-ID: <tasb35$svu$1@gioia.aioe.org>
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 by: emf - Fri, 15 Jul 2022 18:19 UTC

On 2022-07-15 02:27, Stefan Ram wrote:
> emf <emfril@gmail.com> writes:
>> What is now the correct syntax for the ternary expression?
>
> IIRC, JSLint does not check syntax but its authors idea of style.
>
> The syntax for the conditional expression is
>
> ConditionalExpression[In, Yield, Await] :
> ShortCircuitExpression[?In, ?Yield, ?Await]
> ShortCircuitExpression[?In, ?Yield, ?Await] ? AssignmentExpression[+In, ?Yield, ?Await] :
> AssignmentExpression[?In, ?Yield, ?Await]
>
> , so, you can just write, for example, "0?1:1?2:3"
> (which would evaluate to 2).

Brilliant! :)

Re: JSLint: "Wrap a ternary expression in parens, ..."

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From: emfril@gmail.com (emf)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: Fri, 15 Jul 2022 14:24:28 -0400
Organization: Aioe.org NNTP Server
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 by: emf - Fri, 15 Jul 2022 18:24 UTC

On 2022-07-15 11:40, Michael Haufe (TNO) wrote:
> On Thursday, July 14, 2022 at 3:44:28 PM UTC-5, emf wrote:
>> Hi.
>>
>> JSLint now does not like this code (that it used to find OK), saying
>>
>> "Wrap a ternary expression in parens, with a line break after
>> the left paren."
>>
>> =================
>> orb = (orb0Btn.checked)
>> ? 0
>> : (orb5Btn.checked)
>> ? 5
>> : (orb10Btn.checked)
>> ? 10
>> : (orb15Btn.checked)
>> ? 15
>> : 20;
>> =================
>>
>> What is now the correct syntax for the ternary expression?
>
> It's just a jslint setting. You can turn that off I'm pretty sure.
>
> I think it wants:
>
> (
> p ? truePart : (
> p ? truePart : falsePart
> )
> )
>
>
> I think this is because nested ternaries can be a little hard to read if you don't format them properly.
>
> I prefer ESLint

OK, JSLint does not find anything wrong with this

orb = ((orb0Btn.checked)
? 0
: (orb5Btn.checked)
? 5
: (orb10Btn.checked)
? 10
: (orb15Btn.checked)
? 15
: 20);

The only now warning is:

1. Bad assignment to 'panel'. 89.5
panel = document.getElementById("panel");

however the program (see sig below in (nataltransits2.js) still
does not work...

Eustace
--
Natal Transits Calculator
https://emf.neocities.org/nt/nataltransits2.html

Re: JSLint: "Wrap a ternary expression in parens, ..."

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: 15 Jul 2022 18:41:12 GMT
Organization: Stefan Ram
Lines: 40
Expires: 1 Apr 2023 11:59:58 GMT
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 by: Stefan Ram - Fri, 15 Jul 2022 18:41 UTC

emf <emfril@gmail.com> writes:
>orb = ((orb0Btn.checked)
> ? 0
> : (orb5Btn.checked)
> ? 5
> : (orb10Btn.checked)
> ? 10
> : (orb15Btn.checked)
> ? 15
> : 20);

I'd ignore whatever JSLint says about this and
use the following formatting:

orb =
orb0Btn.checked? 0:
orb5Btn.checked? 5:
orb10Btn.checked? 10:
orb15Btn.checked? 15:
20;

. This is so much clearer and easier to read.
No need to harp on the fact that it's formally
a nested structure.

1 + 2 + 3 + 4 + 5

also actually is nested:

((( 1 + 2 )
+ 3 )
+ 4 )
+ 5

because it is being parsed left-associatively.
Still we do not add parentheses and indentations
to make it look that complicated and difficult
to read.

Re: JSLint: "Wrap a ternary expression in parens, ..."

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: 16 Jul 2022 12:19:51 GMT
Organization: Stefan Ram
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 by: Stefan Ram - Sat, 16 Jul 2022 12:19 UTC

ram@zedat.fu-berlin.de (Stefan Ram) writes:
>orb =
>orb0Btn.checked? 0:
>orb5Btn.checked? 5:
>orb10Btn.checked? 10:
>orb15Btn.checked? 15:
> 20;

Or,

orb =
orb0Btn. checked? 0:
orb5Btn. checked? 5:
orb10Btn.checked? 10:
orb15Btn.checked? 15:
20;

. Now, imagine that someone does not know all details of the
ternary operator well, but has a basic idea of it. In which
way could he be mislead by this?

Re: JSLint: "Wrap a ternary expression in parens, ..."

<8fdd197b-5ad1-4d87-8358-40a1d7cb559fn@googlegroups.com>

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Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
From: tno@thenewobjective.com (Michael Haufe (TNO))
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 by: Michael Haufe (TNO) - Sat, 16 Jul 2022 15:37 UTC

On Friday, July 15, 2022 at 1:24:37 PM UTC-5, emf wrote:
> [...]
> The only now warning is:
>
> 1. Bad assignment to 'panel'. 89.5
> panel = document.getElementById("panel");
>
> however the program (see sig below in (nataltransits2.js) still
> does not work...
> Eustace

ESLint points out a number of issues remaining:

<https://emf.neocities.org/nt/nataltransits2.js>

11:9 'ephem' is not defined. (no-undef)

15:16 'ephem' is not defined. (no-undef)

19:9 'ephem' is not defined. (no-undef)

20:9 'ephem' is not defined. (no-undef)

29:9 'reader' is not defined. (no-undef)

30:16 'reader' is not defined. (no-undef)

38:5 'reader' is not defined. (no-undef)

39:5 'reader' is not defined. (no-undef)

40:5 'reader' is not defined. (no-undef)

49:16 'getBDay' is not defined. (no-undef)

81:9 'findTransits' is not defined. (no-undef)

83:9 'panel' is not defined. (no-undef)

89:5 'panel' is not defined. (no-undef)

91:22 'e' is defined but never used. (no-unused-vars)

You have to declare a variable before assigning to it.

Re: JSLint: "Wrap a ternary expression in parens, ..."

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From: emfril@gmail.com (emf)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: Sat, 16 Jul 2022 17:27:59 -0400
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 by: emf - Sat, 16 Jul 2022 21:27 UTC

On 2022-07-16 08:19, Stefan Ram wrote:
> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>> orb =
>> orb0Btn.checked? 0:
>> orb5Btn.checked? 5:
>> orb10Btn.checked? 10:
>> orb15Btn.checked? 15:
>> 20;
>
> Or,
>
> orb =
> orb0Btn. checked? 0:
> orb5Btn. checked? 5:
> orb10Btn.checked? 10:
> orb15Btn.checked? 15:
> 20;
>
> . Now, imagine that someone does not know all details of the
> ternary operator well, but has a basic idea of it. In which
> way could he be mislead by this?

Thanks! Your idea is very simple and easy to understand!

emf
--
Natal Transits Calculator
https://emf.neocities.org/nt/nataltransits2.html

Re: JSLint: "Wrap a ternary expression in parens, ..."

<tavbjb$12sf$1@gioia.aioe.org>

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From: emfril@gmail.com (emf)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: Sat, 16 Jul 2022 17:46:17 -0400
Organization: Aioe.org NNTP Server
Message-ID: <tavbjb$12sf$1@gioia.aioe.org>
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 by: emf - Sat, 16 Jul 2022 21:46 UTC

On 2022-07-16 11:37, Michael Haufe (TNO) wrote:
> On Friday, July 15, 2022 at 1:24:37 PM UTC-5, emf wrote:
>> [...]
>> The only now warning is:
>>
>> 1. Bad assignment to 'panel'. 89.5
>> panel = document.getElementById("panel");
>>
>> however the program (see sig below in (nataltransits2.js) still
>> does not work...
>> Eustace
>
> ESLint points out a number of issues remaining:
>
> <https://emf.neocities.org/nt/nataltransits2.js>
>
> 11:9 'ephem' is not defined. (no-undef)
>
> 15:16 'ephem' is not defined. (no-undef)
>
> 19:9 'ephem' is not defined. (no-undef)
>
> 20:9 'ephem' is not defined. (no-undef)
>
> 29:9 'reader' is not defined. (no-undef)
>
> 30:16 'reader' is not defined. (no-undef)
>
> 38:5 'reader' is not defined. (no-undef)
>
> 39:5 'reader' is not defined. (no-undef)
>
> 40:5 'reader' is not defined. (no-undef)
>
> 49:16 'getBDay' is not defined. (no-undef)
>
> 81:9 'findTransits' is not defined. (no-undef)
>
> 83:9 'panel' is not defined. (no-undef)
>
> 89:5 'panel' is not defined. (no-undef)
>
> 91:22 'e' is defined but never used. (no-unused-vars)
>
>
> You have to declare a variable before assigning to it.

There was only 1 warning because in the process of JSLinting I
had added imported globals. This was nataltransits2.js, and
there is also a nataltransits.js,

Well, I have to start checking the program from the beginning to
find out where the bug is. Then I may seek the advise of this
newsgroup again.

The thing is that the webpage was working fine before... I'm
thinking of starting to comment out one "use strict" at a time,
to see if at some point the program will start working again...

Thanks to all,

Eustace
--
Natal Transits Calculator
https://emf.neocities.org/nt/nataltransits2.html

Re: JSLint: "Wrap a ternary expression in parens, ..."

<4427809.LvFx2qVVIh@PointedEars.de>

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From: PointedEars@web.de (Thomas 'PointedEars' Lahn)
Newsgroups: comp.lang.javascript
Subject: Re: JSLint: "Wrap a ternary expression in parens, ..."
Date: Mon, 25 Jul 2022 04:17:51 +0200
Organization: PointedEars Software (PES)
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 by: Thomas 'Pointed - Mon, 25 Jul 2022 02:17 UTC

Stefan Ram wrote:

> emf <emfril@gmail.com> writes:
>>orb = ((orb0Btn.checked)
>> ? 0
>> : (orb5Btn.checked)
>> ? 5
>> : (orb10Btn.checked)
>> ? 10
>> : (orb15Btn.checked)
>> ? 15
>> : 20);
>
> I'd ignore whatever JSLint says about this and
> use the following formatting:
>
> orb =
> orb0Btn.checked? 0:
> orb5Btn.checked? 5:
> orb10Btn.checked? 10:
> orb15Btn.checked? 15:
> 20;

I would ignore and am ignoring whatever you propose about writing style
because IMHO your writing style is that of a madman. Always has been.

Every single one of your programs that I have seen so far, no matter the
programming language, is next to unreadable and unmaintainable, disregarding
any conventions that exist for that language.

--
PointedEars
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2
Please do not cc me. /Bitte keine Kopien per E-Mail.

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