How to flatten and reduce array with objects to comma separated strings in javascript (ionic | Angular | NodeJS | MongoDB)

Issue

I have this array from an API:

let passions = [
{_id: "60a1557f0b4f226732c4597c",name: "Netflix"},
{_id: "60a1557f0b4f226732c4597b",name: "Movies"}
]

I would like to return exactly the following array:

['60a1557f0b4f226732c4597c', '60a1557f0b4f226732c4597b']

My code:

for(var key in passions){
return key._id
}

Solution

A simple map function should be enough to fix this issue for you.

const extractedIds = passions.map((e) => e._id);

The .map function applies that given function (in this case the function is (e) => e.["_id"]) to each element of your array and returns an array of the results. This means that it's going to return out a new array in the way you're hoping.

Live repl of this in action

Answered By - Slothyboi