Run results for: Test forEach (findIndex) vs forEach (include)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

BigList ForEach => includes in SmallTestList

92/s

SmallList ForEach => findIndex in BigList

41/s

View exact numbers

Test name	Executions per second
✓ BigList ForEach => includes in SmallTestList	92 Ops/sec
SmallList ForEach => findIndex in BigList	41 Ops/sec

Script Preparation code:

var bigList = new Array(15000);
bigList.fill({ id: 0 });
bigList = bigList.map((el, idx) => el.id = idx);
var smallIdList = new Array(1500);
smallIdList.fill({ id: 0 });
smallIdList = smallIdList.map((el) => el.id = Math.floor(Math.random() * 15000))

Tests:

SmallList ForEach => findIndex in BigList
smallIdList.forEach((itemId) => { const index = bigList.findIndex((bigListItem) => bigListItem.id === itemId); });
BigList ForEach => includes in SmallTestList
bigList.forEach((bigListItem, index) => { smallIdList.includes(bigListItem.id) });