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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: using Map Was: Re: get set value in array of objects
Date: Wed, 13 Jun 2018 23:32:57 +0200
Organization: PointedEars Software (PES)
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Andrew Poulos wrote:

> On 13/06/2018 2:43 PM, Andrew Poulos wrote:
>> objArray.get(3).name = 'Contrary';
> 
> The only problem being that if the 'name' property doesn't exist it
> throws an error […]

A “TypeError” exception will be thrown then only if the item is sealed (not 
extensible, see Object.seal()) and it is strict mode code.  Otherwise either 
nothing happens (sealed, non-strict), or the property will be created on the 
item (not sealed).

Another possibility is that the item is a Proxy instance with a setter that 
prevents the addition of properties to its target, in which case the 
behavior is either implementation-defined or user-defined.

-- 
PointedEars
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