Benchmark: findIndex vs indexOf - JavaScript performance [clone]

Script Preparation code:

var arr = new Array(15000);
arr.fill({ id: 0 });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 15000);

Tests:

findIndex
var index = arr.findIndex((num) => num === foo);
indexOf
var index = arr.indexOf(foo);
for loop
var index = -1; for (let i = 0; i < arr.length; i++) { if (arr[i] === foo) { index = i; break; } }

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

indexOf

13.7M/s

findIndex

5.1M/s

for loop

749K/s

View exact numbers

findIndex vs indexOf - JavaScript performance [clone] (version: 1)