Path: csiph.com!weretis.net!feeder4.news.weretis.net!feeder5.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Get object from one of its values
Date: Tue, 20 Dec 2016 23:10:13 +0100
Organization: PointedEars Software (PES)
Lines: 27
Message-ID: <1771227.kXSN5OTJKJ@PointedEars.de>
References: <W9ednbBeYoFENcXFnZ2dnUU7-RfNnZ2d@westnet.com.au> <2298053.9Mp67QZiUf@PointedEars.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
X-Trace: solani.org 1482271814 4129 eJwNx8EBwCAIA8CVQEiUcUBh/xHa+x2MyrudoGMwJ5LlA0i+1zsWxbi8TeovwuRWctp11G2dDxlAENE= (20 Dec 2016 22:10:14 GMT)
X-Complaints-To: abuse@news.solani.org
NNTP-Posting-Date: Tue, 20 Dec 2016 22:10:14 +0000 (UTC)
User-Agent: KNode/4.14.2
Cancel-Lock: sha1:bD/e7vSwKdHptrvETHqeFJqi0Bg=
X-User-ID: eJwNjMENwDAIxFYKgTvKOAmE/UcoDz8sS4ZSmG4EDY1mr7i8WvW1ky9EDAd3uz1Ej+2QWG+xPHeW5lTmcDiX/AFEphUP
X-Face: %i>XG-yXR'\"2P/C_aO%~;2o~?g0pPKmbOw^=NT`tprDEf++D.m7"}HW6.#=U:?2GGctkL,f89@H46O$ASoW&?s}.k+&.<b';Md8`dH6iqhT)6C^.Px|[=M@7=Ik[_w<%n1Up"LPQNu2m8|L!/3iby{-]A+#YE}Kl{Cw$\U!kD%K}\2jz"QQP6Uqr],./"?;=4v
Face: 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
X-NNTP-Posting-Host: eJwNxUcBACAIAMBKDFlxkNE/gt7nhBW17KjokZXdYPuP+TQWB0gUZUBPtTs3EWJmpe2dBsUHIooRlA==
Xref: csiph.com comp.lang.javascript:31924

Thomas 'PointedEars' Lahn wrote:

>     if (!obj.hasOwnProperty("childArray") || obj.childArray.indexOf(5) < 0)
>     {
>       return false;
>     }
> 
>     return true;

This can be simplified to

    return (obj.hasOwnProperty("childArray")
            && obj.childArray.indexOf(5) > -1);

or

    return (obj.childArray && obj.childArray.indexOf(5) > -1);

if it does not matter that the “childArray” property is inherited.
(But it is assumed here that it holds a reference to an Array instance,
and that the Array.prototype.indexOf() method of ES 5+ is implemented.)

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