Run results for: Symbol in obj vs obj instanceof constructor

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 131

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Symbol in obj

9K/s

obj instanceof constructor

9K/s

View exact numbers

Test name	Executions per second
✓ Symbol in obj	9,195 Ops/sec
obj instanceof constructor	9,183 Ops/sec

Script Preparation code:

let Sym = Symbol("test")
class test {
  [Sym]
}
let obj = new test

Tests: