JavaScript get the element in array of object [duplicate]

Question

I have 2 Array:

const arr1 = [
  {
    id: 1,
    name: "a"
  },
  {
    id: 2,
    name: "ab"
  },
  {
    id: 3,
    name: "abc"
}]

and

const arr2 = [{id:"1"}, {id:"3"}]

How can i get from two above array to get the result like that:

const result = ["a", "abc"]

I'm struggling with array built-in function. Thank you for reading.

why do you have mixed values like strings and numbers for id? have you tried anything? — Nina Scholz
– Nina Scholz, Commented Jun 12, 2020 at 15:51

Paul Fitzgerald · Accepted Answer · 2020-06-12 15:40:40Z

1

You could do something like the following.

const arr1 = [{ id: 1, name: "a"}, {id: 2, name: "ab"}, { id: 3, name: "abc" }]
const arr2 = [{ id: 1 }, { id: 3 }];

const ids = arr2.map(item => item.id);
const includedIds = arr1.filter(item => ids.includes(item.id)).map(item => item.id)

console.log(includedIds)

answered Jun 12, 2020 at 15:40

Paul Fitzgerald

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