Get diff between two arrays of objects with ES6 or TypeScript

Question

I have the following arrays:

  arr1 = [{
      id: 1,
      name: 'Diego',
      age: 23
  }, {
      id: 2,
      name: 'Brian',
      age: 18
  }]

  arr2 = [{
      id: 1,
      name: 'Diego',
      age: 23
  }, {
      id: 2,
      name: 'Brian',
      age: 18
  }, {
      id: 3,
      name: 'Pikachu',
      age: 88
  }]

I need get difference between this two arrays, the espected result is:

arr3 [{id:3, name: 'Pikachu', age: 88}]

How do i solve this problem using ES6 or TypeScript?

I tried using SET, but doesn't worked.

First, write or find a routine to take the difference of two sets, based on some equality function. Then, write the equality function for your case. — user663031
– user663031, Commented Aug 1, 2016 at 13:53
I thought about it, but im was looking for a simpler way. I will do as you said — DiegoAugusto
– DiegoAugusto, Commented Aug 1, 2016 at 14:00

Nitzan Tomer · Accepted Answer · 2016-08-01 14:03:01Z

4

Something like this maybe:

let ids1 = arr1.map(item => item.id);
let ids2 = arr2.map(item => item.id);

let diff = ids1.map((id, index) => {
        if (ids2.indexOf(id) < 0) {
            return arr1[index];
        }
    }).concat(ids2.map((id, index) => {
        if (ids1.indexOf(id) < 0) {
            return arr2[index];
        }
    })).filter(item => item != undefined);

(code in playground)

answered Aug 1, 2016 at 14:03

Nitzan Tomer

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