CODEWITHSUNDEEP
javascriptlodash
aloebys
aloebys

Reputation: 123

How to get object that not match in another object lodash

I have 2 arrays with objects.

const a = [
 {
  name: 'John'
 },
 {
  name: 'Adam'
 }
]

const b = [
 {
  name: 'Adam'
 }
]

I want to get the object is not the same in the array and also get the object that is same in arrays as well.

const same = [
 {
  name: 'Adam'
 }
]

const not_same = [
 {
  name: 'John'
 }
]

Using lodash library is it possible?

Upvotes: 0

Views: 1793

Answers (2)

Ori Drori
Ori Drori

Reputation: 191976

You can use _.partition() to get two arrays according to a certain criteria:

const a = [{
    name: 'John'
  },
  {
    name: 'Adam'
  }
];

const b = [{
  name: 'Adam'
}];

const bMap = _.keyBy(b, 'name'); // create a map of names in b
const [same, not_same] = _.partition(a, ({ name }) => name in bMap); // partition according to bMap and destructure into 2 arrays

console.log('same: ', same);

console.log('not_same: ', not_same);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Upvotes: 0

Robby Cornelissen
Robby Cornelissen

Reputation: 97130

You can use intersectionBy and xorBy as follows:

const a = [{
    name: 'John'
  },
  {
    name: 'Adam'
  }
];

const b = [{
  name: 'Adam'
}];

console.log(_.intersectionBy(a, b, 'name')); // values present in both arrays
console.log(_.xorBy(a, b, 'name')); // values present in only one of the arrays
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>

Upvotes: 2

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