Run results for: Lodash sumBy (value and map) vs reduce

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/131.0.6778.73 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 131

Operating system: iOS 17.6.1

Device Platform: Tablet

Date tested: one year ago

map and reduce

6K/s

_.sumBy with map

6K/s

_.sumBy value

4K/s

View exact numbers

Test name	Executions per second
✓ map and reduce	5,794 Ops/sec
_.sumBy with map	5,630 Ops/sec
_.sumBy value	3,704 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:

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}

var arr = [];
for(var i = 0; i < 100000; i++){
  arr.push({value:getRandomInt(100)});
}

Tests:

_.sumBy value
_.sumBy(arr, "value");
map and reduce
arr.reduce((prev, next) => prev + next.value, 0);
_.sumBy with map
_.sumBy(arr, x => x.value);