Merge subarrays using Observables

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Provided it is a typo and the second element has subItems as well (and not searchProfiles), you don’t need flatMap or any thing of the sort, you can do it in a plain map using js array operators:

var transformed = [].concat(...result.map(item => item.subItems));

or in your case

httpResult$.map(result => [].concat(...result.map(item => item.subItems))

if the use of different keys is deliberate, your internal map will require a bit more logic but the mapping will be quite the same

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