Run results for: Object arrays: findIndex vs for loop start from some index

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
findIndex	3885.9 Ops/sec
for loop	38790.5 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);
var startIndex = 7500;

Tests:

findIndex
arr.findIndex((m,i) => i >= startIndex && m.id === foo);
for loop
for (let i = startIndex; i < arr.length; i++) { if (arr[i].id === foo) break; }

Run results for: Object arrays: findIndex vs for loop start from some index

Testing finding an object array via findIndex or by using a for loop starting from some index

findIndex

for loop