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Run results for:
lodash/keyBy vs native reduce vs map
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Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 17
Operating system:
iOS 17.2.1
Device Platform:
Mobile
Date tested:
2 years ago
Test name
Executions per second
lodash/keyBy
10463237.0 Ops/sec
keyBy with native reduce
12285606.0 Ops/sec
keyBy with forEach
6735573.0 Ops/sec
keyBy with for loop
13837790.0 Ops/sec
map
12496121.0 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 keyBy = (array, fn) => { return array.reduce((acc, value) => { acc[fn(value)] = value; return acc; }, {}); }; var keyByForEach = (array, fn) => { var acc = {}; _.forEach(array, (value) => { acc[fn(value)] = value; }); return acc; }; var keyByForLoop = (array, fn) => { var acc = {}; for (let i = 0; i < array.length; i++) { acc[fn(array[i])] = array[i]; } return acc; }; var mapkey = (array, fn) => { return array.map(fn); }
Tests:
lodash/keyBy
_.keyBy(data, (v) => v.name);
keyBy with native reduce
keyBy(data, (v) => v.name);
keyBy with forEach
keyByForEach(data, (v) => v.name);
keyBy with for loop
keyByForLoop(data, (v) => v.name);
map
mapkey(data, (v) => v.name);