RetroBBS - comp.lang.javascript - Re: Simple question on boolean function return value

Simple question on boolean function return value

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From: janis_papanagnou@hotmail.com (Janis Papanagnou)
Newsgroups: comp.lang.javascript
Subject: Simple question on boolean function return value
Date: Fri, 13 Jan 2023 15:56:49 +0100
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by: Janis Papanagnou - Fri, 13 Jan 2023 14:56 UTC

Today I was surprised that some old code did not work as I'd have
expected:

function friday_13th (now)
{ return now.getDay()==5 && now.getDate==13;
}

That function returned 'false' and also putting parenthesis around
the (sub-) expressions did not help. I had to use a local variable
to make that work:

function friday_13th (now)
{ var f13 = now.getDay()==5 && now.getDate()==13;
return f13;
}

Can anyone explain that please?

Janis

Re: Simple question on boolean function return value

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.javascript
Subject: Re: Simple question on boolean function return value
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by: Stefan Ram - Fri, 13 Jan 2023 15:09 UTC

Re: Simple question on boolean function return value

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From: janis_papanagnou@hotmail.com (Janis Papanagnou)
Newsgroups: comp.lang.javascript
Subject: Re: Simple question on boolean function return value
Date: Fri, 13 Jan 2023 16:23:15 +0100
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by: Janis Papanagnou - Fri, 13 Jan 2023 15:23 UTC

On 13.01.2023 16:09, Stefan Ram wrote:
> Janis Papanagnou <janis_papanagnou@hotmail.com> writes:
>> return now.getDay()==5 && now.getDate==13;
>
> There is a pair of parentheses missing above.

Argh! - I had been looking so long at that code that I obviously
got "code-blind". - Thanks!

Janis

Re: Simple question on boolean function return value

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Subject: Re: Simple question on boolean function return value
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by: V V V V V V V V V V - Sat, 28 Jan 2023 17:05 UTC

P i c t u r e , ⠀⠀⠀p a r d o n ?

On Friday, January 13, 2023 at 4:56:58 PM UTC+2, Janis wrote:
> Today I was surprised that some old code did not work as I'd have
> expected:
>
> function friday_13th (now)
> {
> return now.getDay()==5 && now.getDate==13;
> }
>
> That function returned 'false' and also putting parenthesis around
> the (sub-) expressions did not help. I had to use a local variable
> to make that work:
>
> function friday_13th (now)
> {
> var f13 = now.getDay()==5 && now.getDate()==13;
> return f13;
> }
>
> Can anyone explain that please?
>
> Janis

You're dead, Jim. -- McCoy, "Amok Time", stardate 3372.7

devel / comp.lang.javascript / Re: Simple question on boolean function return value

Subject	Author
Simple question on boolean function return value	Janis Papanagnou
Re: Simple question on boolean function return value	Stefan Ram
Re: Simple question on boolean function return value	Janis Papanagnou
Re: Simple question on boolean function return value	V V V V V V V V V V V V V V V V V V