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

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 13597.94.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.186 Safari/537.36

Browser: Chrome 88

Operating system: Chrome OS 13597.94.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.prototype.findIndex	310.7 Ops/sec
Array.prototype.map + Array.prototype.indexOf	1666.1 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);