Run results for: Lodash filter length vs sumby

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Browser: Chrome 70

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Filter length	898895.2 Ops/sec
Sum	883978.7 Ops/sec
Manual	4377513.0 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.2/lodash.min.js"></script>

Script Preparation code:

window.array = [1, 4, 3, 4, 2, 2, 1, 5, 3, 5, 1, 4, 3, 4, 2, 2, 1, 5, 3, 5, 1, 4, 3, 4, 2, 2, 1, 5, 3, 5, 1, 4, 3, 4, 2, 2, 1, 5, 3, 5, 1, 4, 3, 4, 2, 2, 1, 5, 3, 5];

Tests:

Filter length
const x = _.filter(window.array, i => i === 3).length; return x;
Sum
const x = _.sumBy(window.array, i => i === 3 ? 1 : 0); return x;
Manual
let x = 0; let array = window.array; let len = array.length; for (let i = 0; i < len; i++) { if (array[i] === 3) { x++; } } return x;

Run results for: Lodash filter length vs sumby

Filter length

Sum

Manual