lodash groupBy vs Array.reduce group by 100k

5 months ago
User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Test name Executions per second
Lodash 264.4 Ops/sec
Native 187.1 Ops/sec
HTML Preparation code:
x
 
1
2
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
 
var max2 = 100000;
var data = [];
for (var i = 0; i <= max2; i++) { data.push({ id: i }); }
Tests:
  • Lodash

     
    _.groupBy(data, 'id')
  • Native

     
    data.reduce((acc, item) => {
      if (!acc[item.id]) {
        acc[item.id] = [];
      }
      acc[item.id].push(item);
      return acc;
    }, {})
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