Run results for: isUnique (Lodash uniqBy vs Set)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:81.0) Gecko/20100101 Firefox/81.0

Browser: Firefox 81

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Lodash uniqBy	303547.4 Ops/sec
Set	445166.0 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js'></script>

Script Preparation code:

var MyArr = Array.from({
    length: 40
}, () => ({
    x: Math.floor(Math.random() * 40)
}));

function isUniqueLodashUniqBy(arr) {
    return arr.length === _.uniqBy(arr, it => it.x);
}

function isUniqueSet(arr) {
    return arr.length === new Set(arr.map(it => it.x)).size;
}

Tests:

Lodash uniqBy
isUniqueLodashUniqBy(MyArr);
Set
isUniqueSet(MyArr);