Lodash uniqBy function not returning the unique data from an array of object

Question

I have an array of object which looks like

const test = [{'activity': {'Name': 'Peter'}}, {'activity': {'Name': 'Peter'}},
{'activity': {'Name': 'John'}},{'activity': {'Name': 'Derek'}}]

Here I have used this function

const uniqBuyingSessions = _.uniqBy(
      buyingSessions, 'Name'
    )

It returns only the first object, in any case .

So, I was expecting the result to be

const test = [{'activity': {'Name': 'Peter'}},
{'activity': {'Name': 'John'}},{'activity': {'Name': 'Derek'}}]

So, Is there anything that I am doing wrong?

known-as-bmf · Accepted Answer · 2020-07-28 16:46:00Z

3

There is no Name property on your objects.

lodash traverses every object and try to read Name, which resolves to undefined. Since it will return undefined for every object, only the first one is returned (standard uniq behavior).

Name is actually a nested property (activity.Name).

I think this should work:

const uniqBuyingSessions = _.uniqBy(
  buyingSessions, 'activity.Name'
);

answered Jul 28, 2020 at 16:46

known-as-bmf

1,2229 silver badges9 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Vinay · Accepted Answer · 2020-07-29 12:32:26Z

0

const test = [
{ 'activity': { 'Name': 'Peter' } },
{ 'activity': { 'Name': 'Peter' } },
{ 'activity': { 'Name': 'John' } },
{ 'activity': { 'Name': 'Derek' } }
];

const uniq = _.uniqBy(test, item => {
return item.activity.Name;
});
console.log(uniq);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

edited Jul 29, 2020 at 12:32

answered Jul 29, 2020 at 6:49

Vinay

2,3394 gold badges23 silver badges34 bronze badges

Collectives™ on Stack Overflow

Lodash uniqBy function not returning the unique data from an array of object

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related