Run results for: Lodash uniqBy vs Set with Array of object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/109.0.5414.112 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 109

Operating system: iOS 16.2

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Lodash uniqBy	4057.2 Ops/sec
new Set() Destructuring	3458.2 Ops/sec
uniq for loop	1679.6 Ops/sec
uniq by forEach	371.4 Ops/sec
uniq by filter	46.4 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 myArr = Array.from({
    length: 16000
}, () => ({ value: Math.floor(Math.random() * 1000) }));

var myCopy = null;

Tests:

Lodash uniqBy
myCopy = _.uniqBy(myArr, 'value').map(({ value }) => value);
new Set() Destructuring
myCopy = [...new Set(myArr.map(({ value }) => value))]
uniq for loop
var seen = {}; var out = []; const len = myArr.length; var j = 0; for (var i = 0; i < len; i += 1) { var item = myArr[i].value; if (seen[item] !== 1) { seen[item] = 1; out[j++] = item; } } myCopy = out;
uniq by forEach
var result = []; myArr.forEach((item) => { if (result.indexOf(item.value) < 0) { result.push(item.value); } }); myCopy = result;
uniq by filter
var mapMyArr = myArr.map(({ value }) => value); myCopy = mapMyArr.filter((value, index, array) => array.indexOf(value) === index);

Run results for: Lodash uniqBy vs Set with Array of object

Lodash uniqBy vs [...new Set()]

Lodash uniqBy

new Set() Destructuring

uniq for loop

uniq by forEach

uniq by filter