Fast way to get unique attribute list from object list

Question

I have an object list with a large number of elements of Test:

Test:{name:'', creator:''}

Require to extract a unique creators list from that list. I have tried:

const creators = Array.from(new Set(tests.map(t=>t.creator))

This works fine but, due to rapid changes, I have to call this again and again. So, this takes more time and lags the UI. How to build this array more efficiently than the current implementation?

EDIT:

Context information:

Require unique element array(not set) due to rendering on UI by

tests.map(test=><Test data={test}/>)

Why do you convert the set to an array? Just use the set, and update the set when a change to the data occurs. — Teemu, Apr 20 '20 at 05:28
this cannot be answered efficiently without context, please provide more informations. — apple apple, Apr 20 '20 at 05:36
you can probably simply cache the `Set` or use some kind of `Multimap` or this isn't really the bottleneck at all. — apple apple, Apr 20 '20 at 05:37
Does this answer your question? [How to get distinct values from an array of objects in JavaScript?](https://stackoverflow.com/questions/15125920/how-to-get-distinct-values-from-an-array-of-objects-in-javascript) — Muhammad Faizan Uddin, Apr 20 '20 at 05:37

score -2 · Answer 1 · answered Apr 20 '20 at 05:32

-2

You can use lodash library's function "uniqBy" to overcome this issue.

Documentation: https://lodash.com/docs#uniqBy

Example:-

_.uniqBy(data, function (e) {
  return e.creator;
});

answered Apr 20 '20 at 05:32

Mohit Arora

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Fast way to get unique attribute list from object list

1 Answers1