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

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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).

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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

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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! :)

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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.

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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

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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?

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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.

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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

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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

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