Run results for: Finding unique properties from objects

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map then create Set	2811805.0 Ops/sec
Map then use Lodash uniq	3088701.0 Ops/sec
Use Lodash then map	2511743.5 Ops/sec

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js'></script>

Script Preparation code:

var arr = [{"id": 1, "name":"Name1", "country":"USA"}, {"id": 2, "name":"Name2", "country":"Scotland"}, {"id": 3, "name":"Name3", "country":"USA"}, {"id": 4, "name":"Name4", "country":"USA"}, {"id": 5, "name":"Name5", "country":"Scotland"}, {"id": 6, "name":"Name6", "country":"Poland"}, {"id": 7, "name":"Name7", "country":"USA"}];

Tests:

Map then create Set
return new Set(arr.map((o) => o.country));
Map then use Lodash uniq
return _.uniq(arr.map((o) => o.country));
Use Lodash then map
return _.uniqBy(arr, 'country').map((o) => o.country);

Run results for: Finding unique properties from objects

Find fastest way to fetch unique properties from array of objects

Map then create Set

Map then use Lodash uniq

Use Lodash then map