Run results for: findIndex vs indexOf - JavaScript performance (fixed - 4 items)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

indexOf

9.0M/s

findIndex

4.6M/s

View exact numbers

Test name	Executions per second
✓ indexOf	9,038,124 Ops/sec
findIndex	4,552,614 Ops/sec

Script Preparation code:

var count = 4;
var arr = new Array(count);
arr.fill(null);
arr = arr.map((el, idx) => ({ id: idx }));
var randomEl = arr[Math.floor(Math.random() * count)];
var randomId = randomEl.id;

Tests:

findIndex
var index = arr.findIndex((el) => el.id === randomId);
indexOf
var index = arr.indexOf(randomEl);