Check if object nested property exist and return its value

Asked Dec 27 '18 at 07:03

Active Dec 27 '18 at 07:03

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I'm trying to assign a variable with some object property and if that property doesn't exist than i'm assigning something else , for example:

Lets say our object is : a = {"b":{"c":{"d":"e"}}};

var SomeVar = (a && a.b && a.b.c && a.b.c.d) || OtherValue;

this approach is working as expected and if one of the nested properties doesn't exist i won't get an error like :

Uncaught TypeError: Cannot read property 'c' of undefined

Is this the right approach? or there is a better way to do that?

asked Dec 27 '18 at 07:03

avi dahan

Yep, that's how to do it without a helper function, though unfortunately it looks a bit ugly – CertainPerformance Dec 27 '18 at 07:05
if you happen to be using lodash, it's as easy as `_.get(a, 'b.c.d')` – ic3b3rg Dec 27 '18 at 07:07
@CertainPerformance But performance impact will be pretty much the same with this approach and the helper func approach right? – avi dahan Dec 27 '18 at 07:08
The performance impact is basically 0 no matter the method unless you happen to be doing this tens of thousands of times or more in an instant. – CertainPerformance Dec 27 '18 at 07:10
@CertainPerformance Great Thanks a Lot!!!! – avi dahan Dec 27 '18 at 07:12

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