Run results for: Set.union vs Set.add

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36

Browser: Chrome 147

Operating system: Windows

Device Platform: Desktop

Date tested: 3 months ago

Set.union in the other order

1.4M/s

Set.union

485K/s

Set.add in the other order

465K/s

Set.add

356K/s

View exact numbers

Test name	Executions per second
✓ Set.union in the other order	1,360,625 Ops/sec
Set.union	485,345 Ops/sec
Set.add in the other order	464,784 Ops/sec
Set.add	355,677 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const setA = new Set(Array.from({ length: 10000 }, _ => Math.floor(Math.random() * 200)));
const setB = new Set(Array.from({ length: 10000 }, _ => Math.floor(Math.random() * 300)));

Tests:

Set.union
const union = setA.union(setB);
Set.add
const union = new Set(setA); setB.forEach(v => union.add(v));
Set.union in the other order
const union = setB.union(setA);
Set.add in the other order
const union = new Set(setB); setA.forEach(v => union.add(v));