Run results for: Lodash partition VS native JS

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Native reduce

380K/s

Lodash

331K/s

View exact numbers

Test name	Executions per second
✓ Native reduce	380,427 Ops/sec
Lodash	331,217 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 arr = [];

for (i = 0; i < 1000; i++) {
  arr[i] = i;
}

Tests:

Lodash
var [met, rest] = _.partition(arr, function(i) { return i % 2 === 0 });
Native reduce
function partition(array, predicate) { const length = array.length; const truthy = new Array(length); const falsy = new Array(length); let truthyIndex = 0; let falsyIndex = 0; for (let i = 0; i < length; i++) { const item = array[i]; if (predicate(item, i, array)) { truthy[truthyIndex++] = item; } else { falsy[falsyIndex++] = item; } } truthy.length = truthyIndex; falsy.length = falsyIndex; return [truthy, falsy];} var [met, rest] = partition(arr, function(i) { return i % 2 === 0 });