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

lodash sumBy

16.1M/s

sumBy

2.1M/s

sum

1.6M/s

lodash sum

241K/s

View exact numbers

Test name	Executions per second
✓ lodash sumBy	16,108,488 Ops/sec
sumBy	2,074,764 Ops/sec
sum	1,611,667 Ops/sec
lodash sum	240,733 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)