Use hasOwnProperty with dot notation

Question

I have one object var tree={} with attribute tree.leaves.leaf={}. When I perform tree.hasOwnProperty("leaves.leaf") its giving false . Can I use dot function inside hasOwnProperty() function? How to do it?

You can't, but you can do `tree.hasOwnProperty("leaves") && tree.leaves.hasOwnProperty("leaf")` — Niet the Dark Absol, Oct 14 '16 at 11:03
Alternatively, you can use [lodash](https://lodash.com/) which has a special function for searching all nested properties: `_.get([object], '[property]');`, which in your case would look like this: `_.get(tree, 'leaf')` — rorschach, Oct 14 '16 at 11:06

score 2 · Answer 1 · answered Oct 14 '16 at 11:07

2

If you want to create a property with key leaves.leaf, then you need to use bracket notation

tree["leaves.leaf"]={}

now tree.hasOwnProperty("leaves.leaf") will give true.

answered Oct 14 '16 at 11:07

gurvinder372

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mymotherland · Accepted Answer · 2016-10-14T11:14:58.507

1

You have to use something like below

    var tree = {}
    tree["leaves"]={}
    tree["leaves"]['leaf'] = {}
    tree.leaves.hasOwnProperty("leaf")

edited Oct 14 '16 at 11:14

answered Oct 14 '16 at 11:10

mymotherland

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tree.leaves may be undefined for me thats why i exactly needed how i asked – Don Jose Oct 14 '16 at 11:13
these attributes are dynamically created – Don Jose Oct 14 '16 at 11:14
As per my understanding, we need to check the respective property of the object.Here leaf is property of leaves object which comes under tree object – mymotherland Oct 14 '16 at 11:33
Please check here once http://stackoverflow.com/questions/2631001/javascript-test-for-existence-of-nested-object-key – mymotherland Oct 14 '16 at 11:37

Use hasOwnProperty with dot notation

2 Answers2