Run results for: lodash/keyBy vs native map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

lodash/keyBy

6.1M/s

map

4.0M/s

View exact numbers

Test name	Executions per second
✓ lodash/keyBy	6,115,174 Ops/sec
map	3,966,152 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);