Run results for: Array.prototype.findIndex vs Array.prototype.map + Array.prototype.indexOf

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:145.0) Gecko/20100101 Firefox/145.0

Browser: Firefox 145

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
Array.prototype.findIndex	8459.2 Ops/sec
Array.prototype.map + Array.prototype.indexOf	12993.4 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);

Tests:

Array.prototype.findIndex
var index = arr.findIndex(el => el.id === foo);
Array.prototype.map + Array.prototype.indexOf
var index = arr.map(el => el.id).indexOf(foo);