Run results for: Finding unique properties from objects

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map then create Set	1413507.4 Ops/sec
Map then use Lodash uniq	3979639.8 Ops/sec
Use Lodash then map	2545208.0 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