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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

BigList ForEach => includes in SmallTestList

68/s

SmallList ForEach => findIndex in BigList

5/s

View exact numbers

Test name	Executions per second
✓ BigList ForEach => includes in SmallTestList	68 Ops/sec
SmallList ForEach => findIndex in BigList	5 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) });