Run results for: Concat performance: Array vs Object vs Set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/61.0

Browser: Firefox 61

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Array Concat	1633908.0 Ops/sec
Object Concat	679319.1 Ops/sec
Concat set	1584370.0 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var baseArray = Array.from(Array(4).keys()).map(key => 'some-big-ass-string.' + (key + 1));
var baseObject = baseArray.reduce((accumulator, currentItem) => ({ ...accumulator, [currentItem]: true }));
var arraySet = new Set(baseArray);

Tests:

Array Concat
const test = Array.concat.apply([], [baseArray, baseArray, baseArray, baseArray]);
Object Concat
const test = {...baseArray, ...baseArray, ...baseArray, ...baseArray};
Concat set
const test = new Set([baseArray, baseArray, baseArray, baseArray]);

Run results for: Concat performance: Array vs Object vs Set

Array Concat

Object Concat

Concat set