Run results for: Lodash reduce vs transform vs Native reduce on object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/102.0 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 15

Operating system: iOS 15.5

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Lodash reduce	401114.6 Ops/sec
Native	318733.8 Ops/sec
Lodash transform	384909.1 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 10; i < len; i++) {
  var arr = []
  obj['key' + i] = arr
  for (var n = 0, len = 10; n < len; n++) {
    arr.push({ ['key' + n]: n });
  }
}

Tests:

Lodash reduce
_.reduce(obj, (acc, val, key) => { acc[key] = val.map(d => ({ label: key, value: val })); return acc; }, {})
Native
Object.entries(obj).reduce((acc, [key, val]) => { acc[key] = val.map(d => ({ label: key, value: val })); return acc; }, {})
Lodash transform
_.transform(obj, (acc, val, key) => { acc[key] = val.map(d => ({ label: key, value: val })); }, {})

Run results for: Lodash reduce vs transform vs Native reduce on object

Lodash reduce

Native

Lodash transform