Extract Nested Array into Parent Array with JavaScript

Question

I'm working with a JSON feed that includes creative IDs in a field called 'creatives'. Some of these are individual IDs and some are multiple IDs.

For e.g. the JSON might look like:

0: {is_associated_creatives_in_adgroups: true,…}
creatives: ["1111", "2222", "3333", "4444",…]
16: {is_associated_creatives_in_adgroups: true, creatives: ["7777"],…}
creatives: ["7777"]

I'm running the following code:

adsAssociated = resp.data.data.filter(x=>x.is_associated_creatives_in_adgroups).map(y=>y.creatives);

The problem I have is that since some elements of 'creatives' are arrays with multiple values, I can't treat all the nested elements within this call as individual elements within the parent array ('creatives') itself. I tried to use:

adsAssociated = resp.data.data.filter(x=>x.is_associated_creatives_in_adgroups).map(y=>y.creatives.flat());

But this just maps the elements within the nested array as a comma-separated list mapped to the single element.

How do I get instead the expected output to map one-to-one, even the elements that are an array of multiple IDs? In other words, how do I get the JS to process it as if it were...

creatives: ["1111"]
creatives: ["2222"]
creatives: ["3333"]
creatives: ["4444"]
creatives: ["7777"]

Could you elaborate on the required output? Would this be required: [ [ '1111' ], [ '2222' ], [ '3333' ], [ '4444' ] , [ '7777' ] ] OR [ '1111', '2222', '3333', '4444', '7777' ] — Kunal Kukreja
– Kunal Kukreja, Commented Aug 15, 2020 at 15:56

Kunal Kukreja · Accepted Answer · 2020-08-15 18:00:21Z

2

Change this

adsAssociated = resp.data.data.filter(x=>x.is_associated_creatives_in_adgroups).map(y=>y.creatives.flat());

to this

adsAssociated = resp.data.data.filter(x=>x.is_associated_creatives_in_adgroups).map(y=>y.creative).flat();

The adsAssociated array needs to be flattened instead of the individual arrays.

answered Aug 15, 2020 at 18:00

Kunal Kukreja

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