Extracting values from Array of nested Objects in JavaScript

Question

I have an array of objects and trying to extract the objects with a matched value of the array.

const A = [{_id: 'a', name: '1'}, {_id: 'b', name: '2'}, {_id: 'c', name: '3'}] and const B = ['2', '3'] So, I want to match values of Array B to the Array A and get the objects into the Array C like const C = [{_id: 'b', name: '2'}, {_id: 'c', name: '3'}]

  const C = A.forEach((list) => {
    let key = []
    if(list.includes[B]) {
    key.push(list)
     }
  })

I am stuck at here, how can I push those objects to the Array C?

Nina Scholz · Accepted Answer · 2020-09-28 20:03:10Z

1

You could filter the array.

const
    arrA = [{ _id: 'a', name: '1' }, { _id: 'b', name: '2' }, { _id: 'c', name: '3' }];
    arrB = ['2', '3'];
    arrC = arrA.filter(({ name }) => arrB.includes(name));

console.log(arrC);

answered Sep 28, 2020 at 20:03

Nina Scholz

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audzzy · Accepted Answer · 2020-09-28 19:52:35Z

1

when you say matched value, it seems as if you're trying too match the name value.. if that's the case- this shoould work..

const A = [{_id: 'a', name: '1'}, 
           {_id: 'b', name: '2'}, 
           {_id: 'c', name: '3'}];
const B = ['2', '3'];
const C = [];
A.forEach((item) => {
    if(B.filter(x=>x == item.name).length > 0) {
        C.push(item)
    }    
});

answered Sep 28, 2020 at 19:52

audzzy

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54ka · Accepted Answer · 2020-09-28 20:36:15Z

1

I hope I have been helpful

const arrA = [{ _id: 'a', name: '1' }, { _id: 'b', name: '2' }, { _id: 'c', name: '3' }];
const arrB = ['2', '3'];
var arrC = [];

arrB.forEach(element => {
    arrA.forEach(element2 => {
        if (element === element2.name) {
            arrC.push(element2)
        } 
    });
});

console.log(arrC);

edited Sep 28, 2020 at 20:36

answered Sep 28, 2020 at 19:54

54ka

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