Run results for: lodash mapValues vs vanilla Object.keys foreach vs lodash reduce

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.0.1

Device Platform: Mobile

Date tested: one month ago

Test name	Executions per second
lodash mapValues	11336.1 Ops/sec
vanilla object.keys	6800.8 Ops/sec
lodash reduce	14184.6 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 obj = {}
for (let i = 0; i < 1000; ++i) {
    obj[`a${i}`] = i;
}
var transform = (n) => n * n + 1;

Tests:

lodash mapValues
const newObj = _.mapValues(obj, (v, k) => transform(v));
vanilla object.keys
const newObj = {}; Object.keys(obj).forEach((key) => { newObj[key] = transform(obj[key]); });
lodash reduce
const newObj = _.reduce(obj, (acc, val, key) => { acc[key] = transform(val); return acc; })

Run results for: lodash mapValues vs vanilla Object.keys foreach vs lodash reduce

lodash mapValues

vanilla object.keys

lodash reduce