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Groups > comp.lang.javascript > #16836
| From | Stefan Weiss <krewecherl@gmail.com> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: Programming style question |
| Date | 2012-10-24 21:25 +0200 |
| Organization | albasani.net |
| Message-ID | <k69fb6$530$1@news.albasani.net> (permalink) |
| References | (7 earlier) <XnsA0F578505BA8Eeejj99@194.109.133.133> <f5td88dckgks06mf02cssn9e0116qum6c8@4ax.com> <XnsA0F5E78026978eejj99@194.109.133.133> <722e889us0ep0mra233907giq2nnolqhge@4ax.com> <XnsA0F6619B1C3Ceejj99@194.109.133.133> |
On 2012-10-24 09:35, Evertjan. wrote:
>>>Asking what OTHER languages have the same syntax as Javascript?
>>>
>>>This surely is off topic in this NG,
>>>as it does not even help understanding Javascript.
I strongly disagree with that statement. Comparing JavaScript to other
languages is very much on topic in this group. If you're not interested
in those discussions, feel free to skip them.
> var r = aDOMfunction || aDOMfunction("23px");
That's either a typo or complete nonsense. If the function aDOMfunction
exists, copy a reference to the r variable; if it doesn't exist, call it
anyway?
> alert( 'a!=3 is ' + !!( a==3 || alert('a is not 3') ) );
As Gene already noted, this is overly complicated and gives the wrong
result.
> Oh sorry, perhaps you don't like this
> BECAUSE you cannot do this in some other language,
> where you would desperately need multiline if-else-then constructs.
Just because you can write cryptic code in JS doesn't mean you have go
out of your way to do it.
Talking about cryptic code, the || operator in Perl works in a similar
way. There's even some syntactic sugar for assigning default values to
variables:
$foo = $foo || 42;
can be shortened to
$foo ||= 42;
But enough about other languages, I don't want to bore you with these
"off topic" comparisons. Here are some better examples for where the
value returned by the || operator can be used in JS:
// simple default values
var textColor = opts.color || userPrefs.color || "black";
// DOM0 event handler
document.onclick = function (evt) {
var e = evt || window.event;
...
};
// initialize a "namespace" object without overwriting it
var myLib = myLib || {};
myLib.myFunc = function () { ... };
// call a method on an optional argument
function findParagraphs (parentEle) {
return (parentEle || document).getElementsByTagName("p");
}
// combining && and ||
function textOfFirst (parentEle, eleName) {
var ele = parentEle.getElementsByTagName(eleName)[0];
return ele && ele.firstChild && ele.firstChild.data || "";
}
- stefan
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Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-18 08:32 +0100
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-18 10:23 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-18 13:42 +0100
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-18 17:59 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-18 09:56 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-19 00:49 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-19 11:04 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-20 11:52 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-19 12:06 -0700
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-19 23:12 +0100
Re: Programming style question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-10-19 21:56 -0600
Re: Programming style question Bart Van der Donck <bart@nijlen.com> - 2012-10-20 02:21 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-20 12:03 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-20 06:31 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-20 18:30 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-20 10:32 -0700
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-20 22:34 +0100
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-21 10:12 +0200
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-21 09:34 +0100
Re: Programming style question Dr J R Stockton <reply1242@merlyn.demon.co.uk.invalid> - 2012-10-21 17:59 +0100
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-22 09:55 +0200
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-22 09:50 +0100
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-22 04:49 -0700
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-22 14:04 +0100
Re: Programming style question Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2012-10-22 16:07 +0200
Re: Programming style question Dr J R Stockton <reply1243@merlyn.demon.co.uk.invalid> - 2012-10-23 18:22 +0100
Re: Programming style question Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2012-10-22 16:01 +0200
Re: Programming style question Jim T. <x@y.z> - 2012-10-22 12:16 -0400
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-22 11:40 -0700
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-22 14:01 -0700
Re: Programming style question Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2012-10-23 10:07 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-23 09:43 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-23 11:49 +0200
Re: Programming style question Jim T. <x@y.z> - 2012-10-23 15:52 -0400
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-23 13:07 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-23 22:45 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-23 14:14 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-24 09:35 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-24 10:17 -0700
Re: Programming style question Dr J R Stockton <reply1243@merlyn.demon.co.uk.invalid> - 2012-10-25 18:41 +0100
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-25 17:03 -0700
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-25 20:14 -0700
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-25 20:46 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-26 09:55 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-26 06:18 -0700
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-26 17:43 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-26 09:57 -0700
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-26 10:24 -0700
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-26 14:18 -0700
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-27 10:45 +0200
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-27 12:58 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-27 16:18 +0200
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-27 18:08 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-27 18:26 +0200
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-27 19:43 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-27 21:09 +0200
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-27 22:53 +0200
Re: Programming style question John G Harris <john@nospam.demon.co.uk> - 2012-10-28 11:37 +0000
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-28 12:50 +0100
Re: Programming style question Martin Leese <please@see.Web.for.e-mail.INVALID> - 2012-10-28 13:43 -0600
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-28 23:58 +0100
Re: Programming style question John G Harris <john@nospam.demon.co.uk> - 2012-10-29 11:18 +0000
Re: Programming style question Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2012-10-27 23:58 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-28 12:43 +0100
Re: Programming style question Dr J R Stockton <reply1243@merlyn.demon.co.uk.invalid> - 2012-10-27 19:44 +0100
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-24 12:06 -0700
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 21:27 +0200
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-10-24 15:12 -0700
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-10-25 01:29 +0100
Re: Programming style question Stefan Weiss <krewecherl@gmail.com> - 2012-10-24 21:25 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 21:57 +0200
Re: Programming style question Stefan Weiss <krewecherl@gmail.com> - 2012-10-25 01:11 +0200
Re: Programming style question Christoph Becker <cmbecker69@gmx.de> - 2012-10-25 02:00 +0200
Re: Programming style question Scott Sauyet <scott.sauyet@gmail.com> - 2012-10-24 20:27 -0700
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-25 08:44 +0200
Re: Programming style question Adam Silver <adambsilver@gmail.com> - 2012-10-25 04:28 -0700
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-25 23:18 +0200
Re: Programming style question Scott Sauyet <scott.sauyet@gmail.com> - 2012-10-26 08:24 -0700
Re: Programming style question Stefan Weiss <krewecherl@gmail.com> - 2012-11-07 22:13 +0100
Re: Programming style question Tim Streater <timstreater@greenbee.net> - 2012-11-07 21:51 +0000
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-07 23:47 +0100
Re: Programming style question Stefan Weiss <krewecherl@gmail.com> - 2012-11-08 01:14 +0100
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-11-07 16:51 -0800
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-08 16:45 +0100
Re: Programming style question Scott Sauyet <scott.sauyet@gmail.com> - 2012-11-08 08:02 -0800
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-08 17:39 +0100
Re: Programming style question Gene Wirchenko <genew@ocis.net> - 2012-11-08 11:25 -0800
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-08 22:25 +0100
Re: Programming style question John G Harris <john@nospam.demon.co.uk> - 2012-11-09 10:19 +0000
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-09 17:41 +0100
Re: Programming style question Dr J R Stockton <reply1245@merlyn.demon.co.uk.invalid> - 2012-11-10 22:38 +0000
Re: Programming style question Scott Sauyet <scott.sauyet@gmail.com> - 2012-10-22 12:32 -0700
Re: Programming style question Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2012-10-23 10:05 +0200
Re: Programming style question Christoph Becker <cmbecker69@gmx.de> - 2012-10-22 22:11 +0200
Re: Programming style question Stefan Weiss <krewecherl@gmail.com> - 2012-10-23 02:42 +0200
Re: Programming style question Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2012-10-23 10:08 +0200
Re: Programming style question "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-10-20 18:34 +0200
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-18 11:57 +0200
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-18 13:06 +0100
Re: Programming style question "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-10-18 15:32 +0300
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-18 13:37 +0100
Re: Programming style question "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-10-18 15:55 +0300
Re: Programming style question John G Harris <john@nospam.demon.co.uk> - 2012-10-19 10:12 +0100
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-19 07:24 -0700
Re: Programming style question John G Harris <john@nospam.demon.co.uk> - 2012-10-20 17:47 +0100
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 01:15 +0100
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 01:31 +0100
Re: Programming style question "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-10-24 07:34 +0300
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 19:57 +0200
Re: Programming style question "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-10-24 21:02 +0300
Re: Programming style question Patricia Shanahan <pats@acm.org> - 2012-10-18 20:15 -0700
Re: Programming style question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-10-24 01:21 +0100
Re: Programming style question Scott Sauyet <scott.sauyet@gmail.com> - 2012-10-21 17:57 -0700
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