Groups > comp.lang.javascript > #31924

Re: Get object from one of its values

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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)
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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.

Thread

Get object from one of its values Andrew Poulos <ap_prog@hotmail.com> - 2016-12-20 14:43 +1100
  Re: Get object from one of its values Jake Jarvis <pig_in_shoes@yahoo.com> - 2016-12-20 10:42 +0100
    Re: Get object from one of its values Andrew Poulos <ap_prog@hotmail.com> - 2016-12-21 07:25 +1100
  Re: Get object from one of its values Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-12-20 13:33 +0100
    Re: Get object from one of its values Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-12-20 23:10 +0100
  Re: Get object from one of its values John Harris <niam@jghnorth.org.uk.invalid> - 2016-12-20 18:21 +0000

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