Run results for: findIndex vs indexOf - JavaScript performance (fixed 2)

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

678K/s

indexOf (again)

677K/s

findIndex

2K/s

findIndex (again)

2K/s

View exact numbers

Test name	Executions per second
✓ indexOf	677,903 Ops/sec
indexOf (again)	676,900 Ops/sec
findIndex	1,617 Ops/sec
findIndex (again)	1,556 Ops/sec

Script Preparation code:

var arr = new Array(15000);
arr.fill(null);
arr = arr.map((el, idx) => ({ id: idx }));
var randomEl = arr[Math.floor(Math.random() * 15000)];
var randomId = randomEl.id;

Tests:

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