Lodash - Merge object from another array with same key as sub object to main array

Question

const _ = require('lodash');
const parentDetails = [
    {
        'name': '5003',
        'id': '1'
    },
    {
        'name': '5000',
        'id': '2'
    }
];
const childrenDetails = [
    {
        'cid': '11',
        'Reference': '5003'
    },
    {
        'cid': '22',
        'Reference': '5000'
    }
];

Desired Output using lodash library: Extract matching reference from the second array with the name of the first array and append the matching child detail as an object to the first array as shown below. The result should not mutate the original array.

result = [
    {
        'name': '5003',
        'id': '1',
        'childrenDetail' : {
            'cid': '11',
            'Reference': '5003'
        }
    },
    {
        'name': '5000',
        'id': '2',
        'childrenDetail' : {
            'cid': '22',
            'Reference': '5000'
        }
    }
];

I don't think you need lodash for this, what have you tried so far? — Adil Bimzagh
– Adil Bimzagh, Commented Aug 12, 2021 at 16:09
result = []; for (const i of parentDetails ) { for (const j of childrenDetails ) { if (i.name === j.reference) { i.childrenDetail = j; result.push(i); } } } — jolly
– jolly, Commented Aug 12, 2021 at 16:13
I want the same output using lodash library. This is part of a task. — jolly
– jolly, Commented Aug 12, 2021 at 16:15

Adil Bimzagh · Accepted Answer · 2021-08-12 16:30:22Z

1

Here is an example using _.find()

const result = parentDetails.map(elm => {
   const childrenDetail = _.find(childrenDetails, elm2 => elm2.Reference === elm.name);
   if (childrenDetail) return ({...elm, childrenDetail});
});
console.log(result);

You can also replace array.map() with _.map().

edited Aug 12, 2021 at 16:30

answered Aug 12, 2021 at 16:25

Adil Bimzagh

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