Run results for: findIndex vs forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
findIndex	15670.5 Ops/sec
forEach	187038272.0 Ops/sec

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);
arr = arr.filter((value, index, self) => self.indexOf(value) === index)

Tests:

findIndex
const index = arr.findIndex((itm) => itm.id === foo); arr.splice(index,1);
forEach
arr.forEach((value, index) => { if (value.id === foo) { arr.splice(index, 1); } });

Run results for: findIndex vs forEach

compare performance of findIndex and forEach in removing the first result in an array

findIndex

forEach