Run results for: lodash/keyBy vs native map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.5

Device Platform: Mobile

Date tested: 2 years ago

lodash/keyBy

7.4M/s

map

2.5M/s

View exact numbers

Test name	Executions per second
✓ lodash/keyBy	7,442,611 Ops/sec
map	2,467,604 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 data = [
  { name: 'pi', value: 3.14 },
  { name: 'hundred', value: 100 },
  { name: 'truthy', value: true },
  { name: 'falsy', value: false },
  { name: 'estring', value: '2.71828' },
];


var mapkey = (array, fn) => {
  return new Map(array.map(i => [fn(i), i]));
}

Tests:

lodash/keyBy
_.keyBy(data, (v) => v.name);
map
mapkey(data, (v) => v.name);