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Run results for: Lodash UniqBy vs. Vanilla alternative

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Chrome 134
Mac OS X 10.15.7
Desktop
16 days ago
Test name Executions per second
Lodash (_.uniqBy) 2.4 Ops/sec
Vanilla code 0.8 Ops/sec
HTML Preparation code:
AخA
 
1
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
Script Preparation code:
​x
 
const max2 = 10000000; // 10,000,000 (10 Million)
​
const arr2 = Array.from({ length: 10000000 }, (_, i) => Math.random() >= 0.5 ? ({ id: i }) : ({ id: Math.floor(Math.random() * 10) + 1 }))
Tests:

  • Lodash (_.uniqBy)

     
    _.uniqBy(arr2, (el) => el.id)

  • Vanilla code

     
    const idsAlreadySeen = new Set();
    ​
    const uniqArr = arr2.filter(data => {
      if (idsAlreadySeen.has(data.id)) {
        return false;
      }
      
      idsAlreadySeen.add(data.id);
      return true;
    });