Run results for: sum vs sumBy vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
sum	1611667.1 Ops/sec
sumBy	2074764.4 Ops/sec
lodash sum	240733.4 Ops/sec
lodash sumBy	16108488.0 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

const smallArray = Array.from({ length: 1000 }, (_, i) => i);

// Identity function
const identity = (x) => x;

// sum using reduce
const sum = (arr) => arr.reduce((acc, curr) => acc + curr, 0);

// sumBy using reduce with a function
const sumBy = (fn, arr) => arr.reduce((acc, item) => acc + fn(item), 0);

Tests:

sum
sum(smallArray)
sumBy
sumBy(identity, smallArray)
lodash sum
_.sum(smallArray)
lodash sumBy
_.sumBy(identity, smallArray)

Run results for: sum vs sumBy vs reduce

sum

sumBy

lodash sum

lodash sumBy